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                    <text>Tracking environmental and historical footprints on Clarence:
Comparative XRD analysis of clay-rich sediment samples
from a 19th century wreck site in Port Phillip Bay, Victoria, Australia
Adele Zubrzycka and Anthony J. Barham
Archaeology and Natural History
School of Culture, History and Language
ANU College of Asia and the Pacific
The Australian National University
ACT 0200 Australia
E-mail: a.zubrzycka@gmail.com

Ulrike Troitzsch
Earth Materials Group
Research School of Earth Sciences
ANU College of Physical and Mathematical Sciences
The Australian National University
ACT 0200 Australia

Abstract
Little is known about shipbuilding in Australia in the early to mid 19th century. Under the
Australian Research Council (ARC) funded Australian Historic Shipwreck Preservation
Project (AHSPP) (www.ahspp.org.au), underwater excavations were carried out in AprilMay 2012 on the historic trading schooner Clarence, wrecked in shallow waters at Port
Phillip Bay, Victoria in September 1850. During excavations, cores collected by lead
investigator Peter Veth and principle investigator Vicki Richards were found to contain
clay-rich sediment, thought to be ballast. This discovery stimulated investigations of the
micro-sedimentary environments and taphonomy associated with the vessel, especially
fine-grain sediment supply to the wreck and current and tidal influences on the stability
of sediments lodged in and around the site. In order to address these questions,
sediment samples were collected from the wreck, seabed and adjacent shorelines. Clay
fractions were analysed at the Australian National University (ANU) using X-Ray
Diffraction (XRD). Key objectives were to compare mineral signatures in the 'ballast'
from clay-rich sources on the seabed and coastal foreshores possibly incorporated as
the vessel foundered. Results successfully differentiate a) individual samples by seabed
location and b) “ballast” samples in the wreck structure from sampled points around the
wreck. The findings suggest that fine sediment within the Clarence shipwreck is likely to
be clay ballast, emplaced at some point during the schooner's working life. The results
also inform questions regarding the longer-term conservation of Clarence and similar
wrecks located in Australian and Southeast Asian shallow-water settings.
1

�Key words: Clarence, Shipwreck, X-ray Diffraction, Sediment, Ballast, Schooner,
Conservation.
Introduction
Clarence, one of Australia's best preserved carvel-built, two-masted wooden trading
schooners (Gesner, 1985), was constructed on the Williams River in New South Wales
by Sydney merchants Gordon Sandernais and Thomas Ayers in 1841 (Coroneos, 1991).
At the time, the Williams River shipbuilding industry was in its early stages of growth,
producing unique examples of early shipbuilding techniques in Australia (Taylor, 1977).
Small wooden coastal trading vessels were integral to the survival and development of
Australia in the early to mid-19th century before the adoption of steam transport (Taylor,
1977). For the next nine years, Clarence worked as a trade vessel, transporting goods
and passengers to and from Victoria, New South Wales and Tasmania. On the 2nd of
September 1850, the vessel foundered on a sand bank in Port Phillip Bay while
transporting sheep and other goods from Melbourne to Hobart. The vessel remained
partially submerged for a number of years until eventually retreating to the sea floor
(Gesner, 1985). In the mid-1980s the wreck, now protected under the Victorian Heritage
Act 1995, was rediscovered and its historical and archaeological significance
acknowledged as a result of investigations conducted by the Maritime Archaeology
Association of Victoria (MAAV) (Gesner, 1985; Harvey, 1986, 1989). These findings
were subsequently reported to the Maritime Archaeology Unit (MAU) of the Victoria
Archaeology Survey (VAS). In turn, an environmental monitoring program and report
was compiled by Coroneos (1991). Today the wreck is located in shallow waters (4-5 m
deep) where natural processes and small vessel anchorage are negatively impacting
the vessel's structural preservation. In April-May 2012, in accordance with the United
Nations Educational, Scientific and Cultural Organisation (UNESCO) Convention on the
Protection of the Underwater Cultural Heritage, the first phase of excavation, reburial
and in-situ preservation of Clarence was undertaken by the ARC funded AHSPP.
During excavations, it was apparent that there was a shallow layer of loose marine
sediment overlying a dense clay-rich unit (appearing to have retained marks possibly
2

�produced by bucketing of clay into the hold of the schooner) (Veth et al., 2013) lodged
within the vessel structure on top of the schooner's ceiling timbers, between 30-50 cm in
depth (Taylor, 2013). A number of finds including cask staves and lids; coir cordage;
leather patches and other items were also found within the clay deposit (Veth et al.,
2013). Chief investigators Peter Veth, Vicki Richards and project diver Mike Nash,
collected cores of the deposit and sediment in and around the wreck. Although clay is
proposed to have been a popular form of ballast material in the 19th century (Taylor,
2013), little contemporary or historic material exists regarding its use in Australia. This
material makes it difficult to pinpoint particular locations in which clay was collected or
how widespread the practice was. If clay-rich sediments are confirmed to be ballast,
Clarence could be the first example of a clay ballasted vessel to be located and
sampled in the country (Veth et al., 2013).
This discovery and questions surrounding future
preservation of the wreck stimulated
investigations into micro-sedimentary
environments and taphonomy associated with
the site and the stability of sediments lodged in
and around the wreck. Key objectives were to
compare mineral signatures in the 'ballast' from
clay-rich sources on the seabed and coastal
Fig. 1 Short core and grab sample locations
in the wreck of the Clarence. (A. Khan)

foreshores to confirm the likelihood of clay-rich
sediments being ballast. In order to address

these questions, sediment samples were collected from the surrounding onshore
landscape and analysed using XRD in March 2013 along with samples collected in
April-May 2012 from the wreck and adjacent seabed at the Research School of Earth
Sciences (RSES), ANU. This analysis was also undertaken to identify the extent of
sediment preservation or damage within the wreck. XRD is considered a cheap, fast
and relatively effective method for identifying and analysing clay minerals. Although
some criticisms have been made in regards to its overall accuracy, if correct
precautions are taken it can be a useful tool in identifying clay mineral variations in
sediments (Kahle et al., 2002).
3

�Procedures and Methods
Sample Sets and Sampling and Preparation Techniques.
Initial XRD analysis was carried out on nine sediment samples collected by project
divers as part of the Clarence excavations.


Set A: CLI1-0006-9. Samples retrieved as either grab samples or undisturbed
cores from the wreck site. Locations are shown in (Fig. 1).



Set B: CLI2-0001-4 and CLI2-0010. Samples retrieved as either grab samples or
undisturbed cores from the seabed surrounding the wreck. Locations are shown
in (Fig. 1).

XRD analysis was then carried out on 15 samples taken from offshore geography
directly associated with Port Phillip Bay during a field trip to the area in March 2013. At
the Clarence site, the major mechanism by which terrestrial-derived fine grain
sediments enter the near shore zone will be run-off plumes after heavy rain. Cliff
collapse and direct wave erosion of regolith at cliff bases will make minor contributions
(Cardno, 2011). The bedrock and saprolites sampled also approximate the range of
deposits likely to be forming seabeds around and beneath the locations where Clarence
foundered. The following samples were collected based on the above assumptions.


Set C: SPA1-15. 50-200g of well sorted deposits were collected from five
locations across the headlands of Port Arlington and St Leonards (Fig. 2) and
stored in clear zip-lock bags. Samples were retrieved from exposures and
sections along low cliffed shorelines and one low elevation intertidal clay-pan.
Locations and sampling design aimed to produce representative examples of
sediments in the complex weathered geology and regolith of Bellarine shorelines,
which are actively eroding and releasing sediments into the near shore zone.



SPA1-5 and 12-15 were collected from eroding cliff sections.



SPA 6 and 7 were collected from an intertidal weathered outcrop.



SPA 8, 9 and 10 were collected from Edwards Point, where a salt-pan and
mudflat are situated. This site was chosen and sampled as an example of a
sediment sink where fine clay-silts have settled from an intertidal water column
4

�behind a bay bar sand barrier. These provide a first-order proxy for
sediments/clay mineralogies likely to deposit out of the Port Phillip Bay water
column.


SPA11 was sampled from St Leonards Beach, seaward of the adjacent mudflat
at Edwards Point.

Methods
Analysed sediment from Set A was
carefully removed from cores in order
to avoid contamination of clay-rich
deposits with overlying loose marine
sediment. Analysed sediment from
Set B was sampled at 2cm intervals
in order to collect a representative
sample of surface and underlying
sediments on the sea floor. Therefore,
XRD analysis on all Set B samples
(except CLI2-0004 and CLI2-0010)

Fig. 2 Locations of SPA1-15 sediment samples
surrounding Port Phillip Bay. (Google Earth, 2013)

was conducted twice per core and conducted on all aspects of the sample, including
miscellaneous marine sediment. Analysed sediment from Set C was prepared in order
to produce an accurate representation of coastal landscape formations. All remaining
sediment from Sets A, B and C were retained in separate storage containers at the
RSES, ANU. All sample sets were prepared and analysed using powder XRD and clay
separation methods. Powder XRD was carried out with a SIEMENS D501 BraggBrentano diffractometer equipped with a graphite monochromator and scintillation
detector, using Cu K-alpha radiation. Bulk samples were milled for 10 min in ethanol
with a McCrone Micronizing Mill, and dried at 40°C. Samples were suspended on a
side-packed sample holder and analysed from 2 to 70° 2-theta, at a step width of 0.02°
5

�and a scan speed of 1° per minute. Clay separation was performed by the settling
method and samples prepared according to the Millipore Filter Transfer Method (Moore
and Reynolds, 1997). Clay samples were analysed after Mg-saturation (scan range 242° 2theta, step width 0.02°, scan speed 1°/min), saturation with ethylene glycol (2-32°,
0.02°, 1°/min), and heating to 350°C (2-28°, 0.02°, 1°/min) and to 550°C (2-28°, 0.02°,
1°/min). Results were interpreted using the Bruker AXS software package Diffracplus
Eva 10 (2003) for identification, and Siroquant V3 for quantification (using the bulk scan).
Results
Results are shown in Tables 1, 2 and 3 and Fig. 3. Table 1 represents results from Set
A, collected from within the wreck. Table 2 represents results from Set B, collected from
the sea floor surrounding the wreck site. Table 3 represents results from Set C,
collected from surrounding coastal geologies in Port Phillip Bay. Fig. 3 illustrates
variations in mineralogical compositions in Sets A and B, specifically with regards to
kaolinite, plagioclase and
clinopyroxene quantities.
Small quantities of vermiculite
were present throughout all
sample sets: Set A contained
an average of 0.50 ± 0.03%,
one sample in Set B contained
0.4% vermiculite and three
samples in Set C contained
traces of the mineral (SPA5,
0.1%, SPA7, 0.4% and SPA 14, Fig. 3 Mineralogical percentages of kaolinite, plagioclase and
0.6%). Calcite and aragonite

clinopyroxene in Sets A and B. (A. Zubrzycka)

were not well represented in Set A, however CLI-0009, contained 5.1% calcite and 6.2%
aragonite. Quartz, likely to be associated with loose sand particles from the surrounding
seabed, was abundant in Sets A (Mean (M) = 29.9 ± 6.0%) and B (M = 27.5 ± 1.0%).
Sets A and B contained halite that can be attributed to trace levels of salt water retained
in samples during preparation. Small quantities of illite/smectite were present in the
6

�majority of Set B samples (M = 0.4 ± 0.3%) while only one sample in Set A, CLI-0005,
contained the clay mineral (5.6%). The presence of clinopyroxene was unique to Set A
samples CI10008 (13.8%) and CLI10009 (7.7%), which were collected in direct
association with clay-rich deposits in the wreck (Fig. 3). Large quantities of kaolinite
were present in Set A (M = 43.7 ± 16.7%). In comparison, Set B samples were clay poor,
containing only trace levels of kaolinite (M = 1.1 ± 0.2%) (Fig. 3). Plagioclase was
present in both Set A and B with Set A containing an average of 6.8 ± 7.9% and Set B
an average of 2.7 ± 0.5% (Fig. 3). Calcite and aragonite were found in abundance in Set
B (M = 51.2 ± 2.5% and 13.5 ± 0.8%, respectively).
All Set C samples, except SPA11 (beach sand), were clay rich and contained little to no
traces of feldspars, such as plagioclase (0%) and K-feldspar, which was only present in
SPA3 (1.8%). In comparison, Set A contained an average of 3.3 ± 2% K-feldspar. Only
one sample in Set C, SPA10, contained aragonite (15.3%) probably associated with a
midden deposit or activity associated with higher sea levels or storm surges. Clay
fractions from SPA1 and 8 were dominated with illite/muscovite (27.4% and 32.9%,
respectively). Clay fractions from SPA4 (74.3%), SPA5 (89.3%), SPA6 (85.6%) and
SPA15 (87.8%) were dominated by kaolinite. SPA7 contained the largest quantity of
kaolinite at 96.3%. Overall, the mean quantity of kaolinite within Set C was 40.1 ± 37.8%
(as opposed to M = 43.7 ± 16.7% in Set A and 1.1 ± 0.2% in Set B). SPA2 was
dominated by goethite (52.6%), which was not present in Set A or B. Set C contained a
mean average of 24.8 ± 25.3% quartz. This average was reached by excluding SPA11,
a sample of beach sand containing 97.7% quartz. Average quartz quantities in Set C
including SPA11 is 29.7 ± 30.8%. Anatase was present in SPA4 (3.9%), SPA5 (4.6%),
SPA6 (2.9%) and SPA 7 (2.7%), all collected from low lying cliff sections. Because a
number of samples, especially those within data sets A and B contained halite and/or
calcite inaccurate results relating to quantification of minerals and clays in the final
stages of data analysis were present. In order to account for these irregularities total
clays with and without these minerals have been included in all tables.

7

�Discussion
The hypothesis that clay deposits accumulated in Clarence after becoming submerged
in its present position as a result of slack water “fines settling” within the vessel is
inconsistent with data accumulated from the XRD analysis of all samples. This can be
observed by comparing mineralogical variability and clay quantities from all sample sets,
especially those in Set A and B. Some of the most significant results came from
samples CLI1-0008 and CLI1-0009, collected from clay-rich deposits thought to be
ballast. These were the only collected and analysed samples to contain clinopyroxene.
All samples in Set A contained high percentages of kaolinite, however, CLI1-0008 and
0009 contained significantly less kaolinite (21.1% in CLI1-0008 and 32.3% in CLI1-0009)
than analysed samples collected from the wreck, which contained an average of 55.1 ±
6.5% kaolinite (Fig. 3). CLI1-0008 and 0009 also contained higher quantities of
plagioclase and K-feldspar than other samples (see Table 1 and Fig. 3). Thus, clay-rich
sediment, thought to be ballast, found near the schooner's ceiling planking contains a
unique mineralogical composition compared to other sampled sediments within the
wreck structure. The hypothesis that clay-rich sediments may have accumulated on the
wreck over time, taking on the appearance of clay ballast, is also unlikely based on
results from Set B. If clay rich sediments derived from the surrounding landscape had
settled on the wreck via storm surges or tidal and current activity, it is likely that similar
clay minerals would be present on the adjacent seabed. However, low quantities of
kaolinite and a complete lack of clinopyroxene in Set B suggest that this is not the case
(Fig. 3).
XRD results from Set C also indicate that there is no mineralogical relationship between
sediments collected from surrounding coastal geologies and clay-rich sediments found
within the wreck. In regards to the stability of sediments within the wreck, comparing
mineralogical data from sample Sets A and B indicates that bioturbation and damaging
ocean currents have had minimal effect on what may be in situ clay sediments directly
associated with the wreck. This can be observed via the presence of calcite in Set A
where the mineral is only present in CLI-0009 (5.1%). However, biased sample

8

�preparation in the lab may be associated with this result, i.e. shell fragments and other
material being removed from Set A and B samples prior to milling.
Conclusion
The wreck of the Clarence can provide researchers with valuable information on the
history of shipbuilding and ballast use in Australia during the early to mid-19th Century.
The location of the wreck also carries the potential to inform researchers of the
detrimental effect environmental and anthropogenic activity may have on the survival of
the Clarence and other wrecks in similar locations. The discovery of clay-rich sediment
during the 2012 excavation gave researchers a unique opportunity to investigate both of
these questions using identical methodologies. Results from XRD analysis successfully
differentiated samples collected from the seabed adjacent to the wreck, clay-rich
sediments collected within the wreck and sediment collected from the surrounding
coastline. This suggests that clay-rich sediments are unlikely to have been transported
to the wreck via factors such as storm surges or ocean currents carrying fine grained
sediments from the adjacent coastline. Findings suggest that clay sediment within the
Clarence shipwreck is likely to be clay ballast or another form of clay material, emplaced
in the vessel at some point during its working life. Results were further emphasised due
to the presence of clinopyroxene, plagioclase and kaolinite in samples directly
associated with clay-rich deposits found near the hull of the vessel. The survival of clayrich sediment within the wreck suggests that although natural and anthropogenic activity
can have a detrimental effect on the preservation of underwater cultural heritage, it is
possible for archaeologically significant material to be well preserved within these
contexts. In order to reach a more definitive conclusion on the likelihood that clay-rich
deposits are indeed ballast, more data from Australian built wrecks and archival material
is required. It is also suggested that further comparative analysis of clay-rich sediments
found on the wreck and the surrounding landscape be undertaken using alternative
analytical methods.

9

�References
Cardno, 2011. Sediment Transport Modelling – Great Sands, Port Phillip.
RM2271/LJ5518 Version 1.0. Report prepared for Port of Melbourne Corporation, 6
March 2011, Cardno Victoria Pty Ltd, Collingwood, Victoria.
Coroneos, C., 1991. Historical Shipwreck, The Clarence (1841-1850) Conservation Plan.
Unpublished report submitted to the Victoria Archaeological Survey, Melbourne, Victoria.
Gesner, P., 1985. Clarence Report: Historical Documentation. Unpublished report
submitted to the Victorian Archaeological Survey, Melbourne, Victoria.
Harvey, P. 1986. A Pre-disturbance Survey of the Shipwreck Clarence in Port Phillip.
Unpublished report submitted to the Victorian Archaeological Survey, Melbourne,
Victoria.
Harvey, P. 1989. Excavation of the Shipwreck Clarence: Port Phillip Bay, October 1987.
Unpublished report submitted to the Victorian Archaeological Survey, Melbourne,
Victoria.
Kahle, M., Kleber, M. and Jahn, R., 2002. Review of XRD-based quantitative analyses
of clay minerals in soils: The suitability of mineral intensity factors. Geoderma, Vol. 109
(3-4): 191-205.
Moore D. M., and Reynolds, R. C., 1997. X-ray Diffraction and the Identification and
Analysis of Clay Minerals. 2nd edition, Oxford University Press.
Taylor, P., 2013. Shipwrecks: A Practical Guide to Research and Discovery. Scuttlebutt
Press, Australia.
Veth, P., Philippou, C., Richards, V., Staniforth, M., Rodrigues, J., Khan, A., Creagh, D.,
Viduka, A., Barham, A., MacLeod, I., and Harvey, P., 2013. The Australian Historic
Shipwreck Preservation Project 2012: First report on the background, reburial and insitu preservation at the Clarence (1841-50). Bulletin of the Australasian Institute for
Maritime Archaeology, Vol. 37: 1-19.

10

�Biography
Adele Zubrzycka is a Masters of Archaeological Science candidate at the Australian
National University. Her Masters thesis examined built structures and material culture
associated with the first Presbyterian mission station established in Vanuatu (1848). Her
research interests lie in historical archaeology with an emphasis on the colonial period
in South Asia, specifically the production and trade of indigo in India.

Anthony Barham is a geoarchaeologist by training with a specific interest in landscape
stratigraphy and archaeological site environments. His research spans Regolith and Soil
Science, Quaternary Science and Archaeology. He has a long-standing interest in the
Holocene geomorphological development and human occupation record of Australian
tropical coastlines, especially regional syntheses of archaeological and
palaeoenvironmental records in Torres Strait, and recently on the Kimberley coast of
Western Australia (WA). Current research includes evaluating impacts of past tsunami
events (and cyclone storm surges) in WA using archaeological data sets.

Dr Ulrike Troitzsch is the X-ray Diffraction Laboratory Manager at the Australian
National University, Canberra. Her thesis was based on the crystal structure and
thermodynamic properties of titanite solid solution Ca(Ti,Al)(O,F)SiO4. Her research
interests lie in experimental and metamorphic petrology, mineralogy, crystal chemistry,
solid solutions, ceramics granites and migmatites crystal structure determination and
refinement.

11

�CLI1-0005

CLI1-0006

CLI1-0007

CLI1-0008

CLI1-0009

Location

Close
to Near keelson, Centre
ceiling
stern end
wreck
planking near
foremast
stump

of Close
to Near
ceiling
ceiling
planking, bow
planking near end
foremast
stump

Goodness of
2
fit X

3.16

3.80

3.31

4.09

3.55

Quartz

34.9

22.5

25.2

36.6

30.4

Plagioclase

-

3.9

2.3

20.2

7.9

K-feldspar

-

3.6

3.2

4.8

5.0

Halite

1.2

5.9

2.5

0.5

0.6

Calcite

-

-

-

-

5.1

Illite/smectite

5.6

-

-

-

-

Vermiculite

-

0.2

0.7

0.6

0.8

Aragonite

-

-

-

-

6.2

Gypsum

-

-

-

-

2.1

Illite/muscovite

10.4

7.0

5.5

2.4

1.9

Kaolinite

47.9

56.9

60.6

21.1

32.3

Clinopyroxene

-

-

-

13.8

7.7

Total

100

100

100

100

100

Total clay

63.9

64.1

66.8

24.1

35.0

Total clay w/out
carbonates or
halite

64.7

68.1

68.5

24.2

39.7

Minerals

Table 1 CLI1 samples collected from the Clarence wreck site, April/May 2012. (A. Zubrzycka)

12

�CLI20001 0-2
cm

CLI2CLI-0002
0001 2-4
cm

CLI20003 0-2
cm

CLI20003 2-4
cm

CLI20004

CLI20010

Location

Stern
end,
starboard
side.

Stern
end,
starboard
side.

Bow end,
Stern
starboard
end,
starboard side.
side.

Bow end,
starboard
side.

Bow end, Bow end,
port side. port side.

Goodness of
fit X2

2.76

2.55

2.52

2.43

2.47

2.29

2.38

Quartz

28.5

30.6

28.4

28.7

25.4

24.8

26.1

Plagioclase

2.5

3.0

3.8

2.7

2.3

2.7

2.2

Halite

1.3

0.6

1.2

1.0

1.6

0.9

1.1

Calcite

51.3

48.7

48.2

49.3

53.6

54.7

52.5

Dolomite

1.6

1.1

1.1

1.2

1.0

1.0

1.2

Aragonite

12.5

12.5

14.2

14.7

13.6

13.3

13.9

Vermiculite

-

0.4

-

-

-

-

-

Illite/muscovite 1.3

1.0

1.5

0.5

1.2

1.0

1.8

Illite/smectite

-

1.0

0.5

0.3

0.4

0.3

0.3

Kaolinite

1.0

1.1

1.1

1.6

0.9

1.3

0.9

Total

100

100

100

100

100

100

100

Total Clay

2.3

3.5

3.1

2.4

2.5

2.6

3.0

Total clay
w/out
carbonates
and halite

6.9

9.4

8.8

7.1

8.3

8.6

9.6

Minerals

Table 2 CLI2 samples collected from adjacent sea floor associated with the Clarence wreck site,
April/May 2012. (A. Zubrzycka)

13

�SPA1 SPA2 SPA3 SPA4 SPA5 SPA6 SPA7 SPA8 SPA9

Goodness
of fit X2

SPA1 SPA1 SPA1 SPA1 SPA1 SPA1
0
1
2
3
4
5

2.97 2.55 3.39 3.57 4.85 4.51 5.15 4.32 4.07 3.42 3.04 3.89 3.99 4.59 4.51

Minerals
Quartz

44.1 28.1 64.9 -

0.5

0.3

-

14.9 13.9 25.9 97.7 74.4 55.4 17.6 8.4

K-feldspar

-

-

-

-

-

-

-

-

-

-

-

Goethite

10.7 52.6 -

1.6

3.4

7.4

-

-

-

-

-

-

10.9 14.9 -

Hematite

-

-

-

14.8

3.1

-

-

-

-

2.3

2.8

-

-

-

Halite

-

-

-

5.4

1.8

0.7

0.6

14.7 42.8 9.4

-

-

-

-

1.9

Calcite

14.7 4.4

6.5

-

-

-

-

1.8

-

11.0 -

-

-

-

-

Aragonite

-

-

-

-

-

-

-

-

-

15.8 -

-

-

-

-

Gypsum

-

-

1.6

-

-

-

-

1.3

3.7

1.5

-

1.1

0.7

-

-

Smectite

-

9.6

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

0.1

-

0.4

-

-

-

-

-

-

0.6

-

Vermiculite -

-

1.8

-

-

Illite/
muscovite

27.4 3

20.8 -

0.30 -

-

32.9 16.8 18.8 -

-

-

1.9

1.9

Illite/
smectite

-

-

-

-

-

-

17.5 10.6 7.5

-

-

-

-

Kaolinite

3.1

2.3

4.4

74.3 89.3 85.6 96.3 16.9 12.2 10.1 -

21.7 33.0 65.0 87.8

Anatase

-

-

-

3.9

-

Total

100

100 100 100 100

Total Clay

30.5 14.9 25.2 74.3 89.7 85.6 96.7 67.3 39.6 36.4 0.0

Total clay 35.8 15.6 27
w/out
carbonates
and halite

4.6

-

2.9

2.7

-

-

-

-

-

-

-

100 100 100 100 100 100 100 100 100

78.5 91.3 86.2 97.3 80.6 69.2 57.1 0.0

100

21.7 33.0 67.5 89.7
22.3 33.0 67.5 91.4

Table 3 SPA samples collected from geology surrounding Port Phillip Bay, March 2013. (A.
Zubrzycka)

14

-

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                  <text>This session will focus on in-situ preservation and conservation management issues, conservation analyses and treatments, and applied conservation research of archaeological materials from freshwater, marine and wet terrestrial sites. The main purposes of this session are to encourage the exchange of ideas and practices as well as the development of conservation networks throughout the region. Presentations, posters and workshops are invited that address any of the following areas:&#13;
â€¢ In situ preservation of marine archaeological materials, including reburial practices&#13;
â€¢ Conservation management of shipwreck sites, including on-site monitoring&#13;
â€¢ Conservation treatment case studies&#13;
â€¢ Research into the analysis and treatment of wet archaeological materials&#13;
â€¢ Review of the status of wet archaeological conservation programs in the Asia Pacific region&#13;
â€¢ Development of collaborative conservation research and treatment programs Suggestions for additional topics are welcomed by the session organizers. </text>
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                <text>Little is known about shipbuilding in Australia in the early to mid 19th century. Under the Australian Research Council (ARC) funded Australian Historic Shipwreck Preservation Project (AHSPP) (www.ahspp.org.au), underwater excavations were carried out in April- May 2012 on the historic trading schooner Clarence, wrecked in shallow waters at Port Phillip Bay, Victoria in September 1850. During excavations, cores collected by lead investigator Peter Veth and principle investigator Vicki Richards were found to contain clay-rich sediment, thought to be ballast. This discovery stimulated investigations of the micro-sedimentary environments and taphonomy associated with the vessel, especially fine-grain sediment supply to the wreck and current and tidal influences on the stability of sediments lodged in and around the site. In order to address these questions, sediment samples were collected from the wreck, seabed and adjacent shorelines. Clay fractions were analysed at the Australian National University (ANU) using X-Ray Diffraction (XRD). Key objectives were to compare mineral signatures in the 'ballast' from clay-rich sources on the seabed and coastal foreshores possibly incorporated as the vessel foundered. Results successfully differentiate a) individual samples by seabed location and b) â€œballastâ€ samples in the wreck structure from sampled points around the wreck. The findings suggest that fine sediment within the Clarence shipwreck is likely to be clay ballast, emplaced at some point during the schooner's working life. The results also inform questions regarding the longer-term conservation of Clarence and similar wrecks located in Australian and Southeast Asian shallow-water settings.</text>
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                    <text>Trade in Ceramics on Guam in the Wake of the Manila
Galleon
Lon E. Bulgrin
Archaeologist/Cultural Resources Manager Navy Base Guam
Abstract
Various colonial factors led to the Mariana Islands being one of the most
economically isolated areas of the Pacific from the late 17th century until
the late 18th century. This isolation is reflected in the dearth of artifacts of
European and Asian origin in the archaeological record. Starting in the
late 18th century rules on public trade were relaxed and outside goods
became more readily available in the Marianas, if still uncommon. This
paper considers the ceramic collection from the Rosario House located in
Hagatna, Guam. The Rosario House has the largest data set of imported
Euro-American and Asian historical artifacts that has been discovered in
the Mariana Islands to date. The collection is dominated by Provincial
Chinese porcelains and stonewares but also includes a sample of refined
European earthenwares.
Key words: Guam, Pacific Islands, Manila Galleon, Ceramics

Introduction
The Mariana Islands are some of the most geographically isolated islands
in the Western Pacific. They lie on the western periphery of Oceania,
located approximately 1200 miles southeast of Japan and 1500 miles east
of the Philippines (Fig. 1). Spanish colonial policies of the late 17th
century further isolated the Chamorro people of the Marianas from other
indigenous polities in the Pacific. This solitude and segregation from the
rest of Oceania would last through the late 19th century. This isolation
extended to economic exchange even as they acted as a key nexus in the
Manila Galleon trade. This paper will examine Guam’s place in world trade

�at the end of the Manila Galleon trade through archaeologically recovered
ceramics.

Fig. 1: Map of the Mariana Islands. (Mike Carson)
Historic Background
Guam was the first landfall in the Pacific of an occupied island by Magellan
and his exhausted scurvy-ridden crew in his quest to reach the Spice
Islands. When Magellan and his crew made anchor on Guam on that first
long trek across the Pacific they felt both saved and threatened in the
initial lifesaving exchanges of food and water that were made with
indigenous Chamorro inhabitants. The day after contact Magellan’s men
launched an assault on a Chamorro village and burnt most of it down in
the course of recovering a ships boat needed to sound future anchorages.
Yet, at the same time that these Europeans were conducting a raid
against one Chamorro village they were busy trading for fresh food and
water with others. This ambiguity involving violence continued through the
early Manila Galleon trade (Rogers 1995; Giraldez 2015).

�For the next 150 years or so, the Mariana Islands were common stopping
places on the southern leg of the Manila Galleon route to take on water,
fruit, and fresh food. Trade was done at a distance with laughing
Chamorros making sea-borne trades of rice and other victuals that often
turned out to mostly consist of baskets of rocks and sand or coconut oil
heavily diluted with seawater (Pigafetta 1521 and Legaspi 1564 in Barratt
2003: 56 and 61-62). The Chamorros had to maintain a safe distance from
the Spanish ships or they might them find themselves impressed as
involuntary translators for future voyages or worse yet working the pumps
all the way to Manila in the stinking, over heated bilges of leaking galleons
(Giraldez 2015:49).
The Spanish mission and the colonization that rapidly followed in the
Marianas were directly related to the glimpses of the islands from the
passing galleons that inflamed the imaginations of various churchmen
who saw them as fertile fields for the harvest of souls (Driver 1989). The
Spanish crown showed initially little interest in acquiring a string of tiny
islands without spice, textile, or mineral resources. Zealous religious first
jumped ship to convert the Chamorro. After a campaign conducted by the
politically connected Father San Vittores a Jesuit mission was established
(McDonough 2004; Coomans 1997). The Marianas mission rapidly found
itself embroiled in cultural and political conflict with local power structures
and called for protection from the Crown (Lesveque 1995; Levesque
1996). However, the military companies sent for their protection were “like
a rich armor worn in heat of day that scalds with safety” (Shakespeare
Henry IV PtII.). The churchmen spent much of the next century or so
complaining about the character and behavior of the troops and their
captains. Still without the military presence the Catholic Church would
have been unable to further their mission of conversion. The Spanish

�controlled islands became safe harbors for galleons battered by typhoons
or just poorly captained or incompetently crewed in the Acapulco crossing.
These islands were also a welcome stop to take on fresh fruit and
vegetables during the Manila crossing.
Prior to European Contact the Chamorro people had maintained limited
trading contact and social ties with the Caroline Island groups of Chuuk
and Yap to the south and with the Philippines to the west (Farrell
2011:211; Quimby 2011). The punctuated natures of these trade ties are
reflected in the sparse evidence of long distance trade in the
archaeological record. Linguistic and historic accounts have been
interpreted to represent a limited trade in iron with the Philippines (Quimby
2011) and perhaps iron fragments discovered at the Obyan latte site
(Spoehr 1957) on Saipan may reflect a Pre-Contact trade in iron.
Ethnohistoric evidence and historical accounts of the Carolinian contacts
with the Marianas, however, are clear on the trade and interaction. The
descendents of migrants from the outer islands of Yap and Chuuk make
up a small but significant population of the Northern Mariana Islands and
their relatives still visit Saipan using the traditional navigation chants to
guide their way. At some time in the late 17th century the navigation routes
disseminated and controlled by chants between the islands to the south
to Guam were magically closed by the master navigators of the Carolines
in response to stories of Spanish cruelty related by Guam Chamorros
(Smith 2003:79; Farrell 2011:211). The Marianas were now isolated from
their traditional Pacific trade partners.
By the early 19th century Spanish policies of isolation, the Catholic
mission, and the relentless hammering taken by the Chamorro people
from introduced European and Asian diseases had eliminated the limited
ties that once had bound them with their neighbors in the Pacific (Farrell

�2011). The Spanish mission in the Marianas concentrated not only on the
introduction of the Catholic faith but also inculcation and enforcement of
European social and gender roles (Russell 1998). A primary goal was to
eliminate the animistic beliefs and ancestor worship of the Chamorro. To
this end, indigenous songs, dances, and oral histories were actively
discouraged by the Jesuit Fathers. Indigenous knowledge systems that
did not explicitly find favor with the Church rapidly eroded. Proprietary
knowledge of all kinds was made vulnerable by the need to limit
transmission to chosen heirs, the association with non-Catholic ancestors,
and the unpredictable appearances of diseases that swept away the living
repositories. Seafaring and navigational knowledge and expertise were
heavily impacted by this social revolution. A people capable of making
rapid voyages up and down the Marianas chain and of delivering
passengers from Guam to Manila in 4 to 6 days as late as 1704 were
barely capable of sailing beyond the northern tip of Guam by 1819
(Freycinet 2003, Originally 1827).
The Spanish were interested in maintaining this isolation for geo-political
as well as religious reasons, primarily to deny access to rival European
powers. The Marianas were an important stop off point for the Manila
galleons making their voyages between Manila and Acapulco, carrying
New World silver in exchange for the spices, silks, and gold of Asia. The
Pacific route of the galleons was composed of extremely empty distances
with very few points where fresh water and food could be brought on
board. The galleon routes could be approached by pirates from only a
few points and the Spanish wanted to limit this. Denying access to the
Marianas was a way to keep English and Dutch at bay. Accordingly the
Spanish crown did not allow trade with foreign nationals in the Marianas.
They maintained their own garrison and mission on Guam with an annual

�situado or subsidy (Farrell 2011:192) that arrived on a very irregular basis.
A series of venal governors usually managed to reacquire the majority or
entirety of this subsidy before they were recalled, actively cheating their
troops as well as the local subjects. The economies on the inhabited
islands of Guam, Rota, and Saipan were subsistence based with limited
internal trade and no outside trade to speak of. Local people saw little to
no benefit from the galleon trade or the government (Rogers 1995).
After the political unrest and revolutions in South and Central America
starting in 1808, the Spanish money making machine, trading silver mined
by encomienda labor in the New World for Asian gold and goods in the
Philippines totally broke down (Giraldez 2015). The structural position of
the Mariana Islands changed for the Spanish crown. No longer were the
islands an essential supply stop and defensive shield for the Manila
galleons located within a “Spanish lake”. Now they were at the ends of
the earth, just beyond the Philippines, and a fiscal drain. Accordingly, the
yearly situado, of New World silver, that provided payment for the Mission
and the garrison was radically reduced (Rodgers 1995:93). Economically,
changes had already been made in the trade policy in the Marianas before
the revolutions. Governor Cerain, 1776-1786, had issued a proclamation
allowing both internal trade as well as trade with passing ships. This was
due to a deteriorating economy and the increase of foreign whaling
vessels in the Pacific.
The 19th century saw a slow opening and reintegration of the Marianas
with the rest of the world. The Pacific whaling fleet composed primarily of
U.S. and British vessels consistently wintered a few ships at Guam and
Saipan. Sailors came ashore looking for leisure, fresh food, liquor and
companionship, not necessarily in that order. The 19th century also saw
a reappearance of Carolinians in the Marianas. The chief and master-

�navigator Aghurubw reopened the navigational ways to the Marianas and
led a fleet of canoes of Carolinean families north (Driver and Brunal-Perry
1996; Smith 2003).
settle on Saipan.

The governor of Guam gave them permission to
More canoes would come north in the continuing

decades and would help to spur interisland trade. The Marianas remained
underdeveloped with land ownership becoming more concentrated in the
hands of the Church and elite families (Rogers 1995:75). Many of the
smaller landholding families slipped into debt peonage (Rogers 1995).
During the stay over on Saipan and Guam, many whalers lodged with
local families and presumably paid primarily in goods for room and board.
The annual supply ship from the Philippines usually also wintered in the
Marianas until the trade winds were steady. Some wealthy families also
contracted with visiting ships to provide provisions. Providing fresh foods
and salt meats would have required large land holdings so presumably
only those families with significant crown grants would have been major
players in the trade (Madrid 2006:14). Regardless of the participants this
trade would have decreased, as the whaling fleets declined, through the
mid to late 19th century (Rogers 1995:105).
The lives of average Chamorro families were not much affected by these
economic changes. They continued in their yearly rounds of religious
festivals. They conducted small scale agriculture, fished and hunted,
collected wild foods, and practiced limited animal husbandry.

Most

Chamorros retained two residences under the Spanish. During the week
they lived on small farms called lancho and returned to their formal
residence on the weekend to attend religious services (Madrid 2006:8;
Rogers 1995).
In 1898 the United States seized Guam during the Spanish American War.
Following its defeat Spain sold the remainder of the archipelago, the

�Northern Mariana Islands, to Germany.

Japan seized the Northern

Marianas from Germany in 1914 during World War I and Guam from the
U.S, in 1941during World War II. The United States took Saipan, Tinian,
and Guam in amphibious assaults in 1944 and retained the entire
archipelago after WWII (Rogers 1995).

Historical Archaeology and Rosario House
Historical archaeological investigations into the Spanish Period in the
Marianas have been limited. Almost all investigations have focused on
the island of Guam where the vast majority of the population, the Catholic
Mission, and colonial government were located.

There are two principle challenges in conducting historical archaeology in
the Mariana Islands. The first is the paucity of identifiable historic artifacts
and the second is the direct involvement of the island chain in the ground
combat of World War II.
The paucity of identifiable historic artifacts is rooted in two separate
factors. The primary factor is the economic isolation of the archipelago
previously discussed. The second is the hostile preservation conditions.
High heat and humidity, acidic soils and high levels of salt combined with
termites, mildew, and periodic typhoons, rapidly decay most materials
including metal.
The effects of WWII can not be overemphasized in the historic
archaeology of the Marianas. The majority of Saipan and Tinian and a
significant portion of Guam were subjected to naval and aerial

�bombardment and combat ground operations. More importantly, post
battle cleanup and the WWII logistical buildup subjected huge portions of
the islands to the not so tender mercy of the Seabees, who never did
anything with hand tools when it could be done mechanically. Their “Can
Do” spirit was a war winning attitude but it wreaked havoc on the
archaeological sites of the Marianas. This damage was particularly acute
because of the aforementioned lancho residence system.

The three

largest towns and commercial centers on Guam; Hagatna, Sumay, and
Agat were destroyed and built over, as was Garapan, the largest town on
Saipan. In the case of Hagatna significant portions were bulldozed into
the sea to create additional land.

Garapan also suffered extreme

earthmoving. These actions eliminated most of the formal residences in
the Marianas where imported materials were present for archaeologists to
study. Asian and European artifacts have been discovered at former
lancho sites but they are not common finds and they are present in low
densities.
The Rosario House (Fig. 2) is one of the few surviving Pre-WWII buildings
and intact archaeological sites remaining in Hagatna on Guam. The site
was investigated by archaeologists from Micronesian Archaeological
Research Services in 1988 (Moore et.al. 1993). The largest historic
ceramic collection discovered in the Marianas was recovered from these
excavations. In 2009 the Guam Preservation Trust funded the cataloging
of this important collection (Bulgrin 2010).

�Fig. 2: The Rosario House. (Guam Preservation Trust)
Stratigraphical interpretation of the excavations at the Rosario House
indicates historical processes that caused disturbance and soil mixing in
the areas tested. A leaching field and potential excavation for garbage
disposal appear to have mixed PreContact and historical deposits.
Laboratory analyses agreed with these interpretations. Uncertain contexts
have limited chronological interpretations so the collection needs to be
addressed as a totality.
The Rosario House Ceramic Collection
A large variety of European and Asian ceramics were recovered from the
initial testing at the Rosario House. The vast majority of the ceramics
dated from the late 18th century to the late 19th century.

European

ceramics made up 24% of the Rosario House collection and were
dominated by wares manufactured in the United Kingdom. This is no
surprise given the English domination of ceramic production at that time
(Tames 1995:39).

Asian ceramics present at Rosario House were

manufactured in both China and Japan. The Chinese ceramics, porcelain
and stoneware, composed 71% of the collection and tended to cluster in
the late 18th to mid-19th century. Japanese porcelain and stoneware made

�up the remaining 5% of the collection and dated from the late 19th century
to the 20th century.

Fig. 3: European Ceramics. (Adapted from Bulgrin 2010)
European ceramics (Fig. 3) are uncommon finds on historic sites in the
Marianas and the Rosario House is unique in the quantity and richness of
their discovery. European refined earthen wares present were produced
for food service or hygienic purposes. The more utilitarian earthenwares
of the time produced for food preparation and storage such as yellow
ware, Rockingham glazed yellow wares, and annular whitewares were
present but in very low numbers.
Decorated

refined

earthenwares

predominated.

Creamwares,

pearlwares, whitewares, and a very few semi-porcelain sherds were
recovered. The only wares that were not decorated were the creamwares
and a single tin glazed earthenware sherd. These are presumably some
of the earliest European ceramic type introduced into the Marianas (other
than a very few majolica vessels, none of which were discovered at the
Rosario House). Decoration ranges from inexpensive shell edged wares

�and sponge stamped wares to transfer prints.

Transferprints were

recovered in all colors produced, but blue was the most common. Plates
and large serving or hygienic vessels predominated as vessel forms with
cups and bowls making up the majority of the rest of the collection.
Unusual vessel types include an open vegetable dish, a chamber pot or
spittoon, a child’s chamber pot, a possible candlestick and a teapot.
Importantly, none of the recovered ceramics matched any other within the
collection and it appears that they were acquired individually.

Two

unusual finds include a copper luster sherd and a fragment of an animal
figurine.
Chinese porcelains and stonewares made up by far the largest proportion
of the ceramics collected from excavations at Rosario House. This study
does not address the large quantity of utilitarian stoneware recovered at
the site. Asian stoneware jars of various makes and national origins were
ubiquitous in trade within Southeast Asia and the Manila Galleons, being
the shipping containers of their day.
Almost all of the Chinese porcelain (Fig. 4) present was of the type
commonly referred to as Provincial ware whose production was centered
in Fujian province (Macintosh 1977; Sheaf and Kilburn 1988). These
wares were produced for Asian tastes rather than European and are of a
different quality and aesthetic to the porcelain exported to the West.
Porcelain bodies were a uniform light grey. Glazes ranged from pale blue
through pale grey for most sherds. More unusual glaze tints included pale
greenish grey and pale cream colored. Most vessels were decorated with
blue underglaze handpainting but there are examples of underglaze block
printing and overglaze hand painting as well. Unglazed rings on both the
interior and exterior are another common technique present. Unglazed
footrings and sand adhesions are also common. Several sherds were

�clearly of inferior production runs as they appeared to be over oxidized
perhaps due to an early opening of the kiln.

Fig. 4: Chinese Porcelain. (Adapted from Bulgrin 2010)
A small number of porcelain sherds were clearly produced for the
European export trade based on quality, form, and painting style. One
sherd has characteristics of early 19th century English porcelain and
another higher quality painted sherd has an Empire Shape lobed body
(Berthoud 1990:105).
Many porcelain sherds from Rosario House are identical to ceramics
recovered from the wreck of the Junk Tek Sing that sank in 1822 (Pickford
and Hatcher 2000). These include motifs such as stylized peach sprays,
stylized Sanskrit printing, floral sprays, and lingzhi fungus and flower
heads within a spiral or bloom. Koh (2013) has identified the majority of
the porcelain from the Tek Sing as Dehua Blue and White. Dehua blue
and white porcelains were a lesser quality ware that was principally
marketed to Southeast Asia. Koh (2013) has also proposed that the Tek
Sing

cargo

serves

as

a

reference

collection

for

the

late

�Qianlong/Daoguang period (late 18th century – 1850). Nevertheless, the
variety of glazes present and different painting techniques and quality
among the porcelain collection make it unlikely that all of the collection is
the product of the Dehua kilns.
Porcelain

vessel

types

are

overwhelmingly

for

food

service,

predominantly bowls and cups. The general impression from working with
the collection is that sets of bowls and cups are present at the site but this
can not be stated with certainty due to the small size of most of the sherds
recovered and the few cross mends that could be made. A number of
sherds from small plates with a dark blue edge with lotus blossoms was
found in two of the excavation units and were almost certainly a set.
Similar decorated plates are dated from 1825-1850 (Mudge 1986:182).
Block printed “debased Sanskrit” pattern bowls are another possible set
present in the assemblage. The availability of these as sets is reinforced
by block printed “Sanskrit” bowl sherds recovered from excavations at the
Governor’s palace at Hagatna (Schuetz 2007:139).

Fig. 5: Chinese Stoneware. (Adapted from Bulgrin 2010)

�Chinese stoneware (Fig. 5) makes up a small proportion of the Rosario
House collection. Two distinct types are present in the collection. The first
type has a buff body and cream colored glaze. Decoration consists of
crimson overglaze painting. The second type has a body varying from
grey to pale buff to pinkish buff, glazes ranging from pale greyish blue to
cream, and underglaze blue painting.
The ceramic collection from Rosario House seems to be a direct reflection
of economic opportunities for an elite family on Guam.

The earliest

architectural remains at Rosario House date to approximately 1750 but
there are no imported artifacts from that period. Upon legalization of
private trade, foreign artifacts immediately appeared but in low quantities.
With the advent of the whalers quantities increase and more varied goods
are available. European ceramics appear to be individually acquired and
may reflect lodging and board transactions for whaling crews. Chinese
ceramics are available in greater quantity and possibly in sets. However,
the porcelain’s quality is low and lower quality stoneware copies are
sometimes substituted for porcelain vessels.

Provincial porcelain is

difficult to date, particularly as fragmented as it is in the Rosario House
collection. However, the porcelain recovered from the Rosario House site
is extremely similar in style to the cargo recovered from the Tek Sing
wreck of 1822 (Pickford and Hatcher 2000). Logically the porcelain at both
location dates to approximately the same date. Given that cargoes may
have been assembled over time from wares in storage a time frame of the
late 18th century – 1830s seems appropriate for the porcelain. Ceramics
at Rosario House dating to the late 19th century and early 20th century are
almost entirely Japanese stenciled porcelains.
Two different ceramic types, Chinese Provisional porcelain and English
refined earthenwares are predominant in the Rosario House collection.

�Clearly these ceramics were manufactured in two different areas of the
world under very different conditions and their distribution in tandem is
unlikely. It is also interesting that European ceramics appear to have been
acquired singly while Chinese ceramics were available in sets or small
lots of similar decoration. These patterns indicate two different streams
of availability.
It is likely that the European ceramics were acquired in serial transactions
with Euro-American sailors as payments for lodging, meals, or
commodities such as dried meat, coffee or tobacco, that were locally
available. Whaling ships may have carried ceramics as part of a suite of
trade goods to reprovision and refit ships over the whaling voyage. It is
possible that crews were able to draw from these against future wages for
their needs or they may have brought their own trade goods in their sea
chests against future need.
Chinese porcelain availability in sets (Fig. 6) indicates a different kind and
direction of trade. These were available for trade or purchase in bulk, if
not necessarily on a regular basis. Provincial porcelain was produced for
and marketed to the Southeast Asian market. It is unlikely that whaling
ships would have chosen to load these ceramics in bulk at their home
ports in New England or the United Kingdom when cheaper industrially
produced English earthenwares were available. It is also unlikely that
these ceramics are tied to the Manila Galleon. These porcelains would
have been readily available in Manila but in order to be transported to
Guam via the galleon trade they would have had to be trans-shipped
through Acapulco and back to Guam. This is an unlikely scenario as
separate taxes and fees would have had to be paid and the ceramics
could have already been sold for a substantial profit in Mexico. In addition,
the bulk of the Provincial porcelain in the Rosario collection postdates the

�Manila Galleon. Therefore, it appears that these ceramics were being
shipped directly from the Philippines to Guam, most likely by the annual
supply ship or mail schooners. It is ironic that the demise of the galleon
trade actually led to an increased availability of consumer goods on
Guam. It is not clear whether this was speculative trade or orders put in
by local consumers or retailers for delivery.

Fig. 6: Porcelain Patterns. (Adapted from Bulgrin 2010)
Conclusion
Several preliminary conclusions on consumer choice can be made for the
family that lived at the Rosario House given the caveats of limited sample
size. The first is that the end of the galleon trade and the political turmoil
of the South and Central American revolutions expanded the availability
of foreign commodities on Guam. This supposes that other non-preserved
commodities such as fabric that presumably made up the bulk of trade
followed the pattern for ceramics. The second is that options on the
products available were still limited. Large serving bowls and other serving
vessels, and hygienic vessels such as ewers and basins and chamber

�pots were probably only available when European or American ships were
in port. This hypothesized punctuated availability likely extended to other
commodities as well. Rarity and inherent fragility possibly indicate use of
these vessels primarily for display and prestige purposes. In the case of
imported ceramics, there was a preference for food service vessels such
as cups, bowls and plates, over utilitarian vessels such as pans, mixing
bowls, bottles, and jars. Presumably food storage and preparation
functions were being taken up by more durable though heavier
stonewares. In the case of European ceramics, there was a preference
for decorated wares and this continued over time. This is in contrast to
the general trend by European manufacturers of producing plainer, whiter
vessels such as molded ironstones. There was also a preference for blue
decorated wares over other colors. Finally, even when broken, imported
ceramics retained some value as there are multiple examples of broken
sherds rechipped into circular gaming or tally pieces. Hopefully, more
archaeological testing will be conducted at the Rosario House in
conjunction with planned rehabilitation and these hypotheses can be
tested with additional data.
(Please note that this research was conducted privately by the author
under Guam Preservation Trust Grant GPTG-08-01 and does not
represent the opinion or the policy of the U.S. Navy)

References
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Division of Historic Preservation: Saipan.
Berthoud, M.,1990
A Compendium of British Cups. Micawber
Publications: Shropshire.

�Bulgrin, L., 2010 Catalog of the Non-Utilitarian Ceramics from the Rosario
House Site, Hagatña, Guam. Report prepared under Guam Preservation
Trust Grant GPTG-08-01
Coomans, P., 2000
1667-1673.

History of the Mission in the Marianas Islands,

Occasional Historical Papers Series No. 4, CNMI Division of Historic
Preservation: Saipan.
Driver, M., 1989 Fray Juan Pobre in the Marianas, 1602. Richard Flores
Taitano Micronesian Area Research Center, University of Guam:
Mangilao.
Driver, M. and O. Brunal-Perry (eds), 1996 Carolinians in the Mariana
Islands.
Richard Flores Taitano Micronesian Area Research Center, University of
Guam: Mangilao.
Farrell, D., 2011 History of the Mariana Islands To Partition. Public School
System, Commonwealth of the Northern Mariana Islands, Saipan.
Freycinet, L., 2003 An Account of the Corvette L’Uranie’s Sojourn at the
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Papers Series No. 13, CNMI Division of Historic Preservation: Saipan.
Giraldez, A., 2015 The Age of Trade: The Manila Galleons and the Dawn
of the Global Economy. Rowman and Littlefield: Lanham,MD.
Koh, N.K., 2013 Dehua Blue and White. Retrieved June 26, 2017, from
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Macintosh, D., 1977
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�Madrid, C., 2006 Beyond Distances: Governance, Politics and
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Archaeological Excavations at Rosario House, Agana, Guam. Report
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                <text>Various colonial factors led to the Mariana Islands being one of the most economically isolated areas of the Pacific from the late 17th century until the late 18th century.  This isolation is reflected in the dearth of artifacts of European and Asian origin in the archaeological record.  Starting in the late 18th century rules on public trade were relaxed and outside goods became more readily available in the Marianas, if still uncommon. This paper considers the ceramic collection from the Rosario House located in Hagatna, Guam. The Rosario House has the largest data set of imported Euro-American and Asian historical artifacts that has been discovered in the Mariana Islands to date.   The collection is dominated by Provincial Chinese porcelains and stonewares but also includes a sample of refined European earthenwares. </text>
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