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METALS MONOGRAPH

Our new Metals monograph will apply current archaeological perspectives to interpret metals and metals related evidence from Ban Chiang and related sites.

The discovery of the bronze age culture of Ban Chiang changed views about the technological sophistication of prehistoric Southeast Asia. Before the 1970s, Southeast Asia was considered a technological backwater. The prevailing scholarly opinion held that the earliest metal use in Southeast Asia was no older than ca. 500 B.C.

Elizabeth Hamilton looking at a photomicrograph through a microscope

But the 1974 and 1975 excavations at Ban Chiang—as well as survey and excavations at Non Nok Tha, Ban Phak Top, Ban Tong, and Don Klang—demonstrated that Southeast Asia did have sophisticated metallurgy as early as the first half of the 2nd millennium B.C. This is over a thousand years earlier than was previously suspected. Another surprise was that this timeframe was long before there were traces, in the archaeological record of the area, of any societies more complex than simple egalitarian villages.

Using current archaeological perspectives to interpret the prehistoric bronze technology of Thailand, Drs. Joyce White and Elizabeth Hamilton are now finalizing a monograph that presents metals and related evidence from four sites in northeast Thailand, Ban Chiang, Ban Tong, Ban Phak Top, and Don Klang. The monograph will include a history of viewpoints about the social place of early bronze technology, current evidence for its varied roles in prehistoric societies, a new paradigm for understanding metals in society, and current methodological approaches for the study of prehistoric metals. This is the second volume in the Penn Museum Ban Chiang monograph series.

Collaborating scholars include Dr. Vince Pigott on prehistoric copper mining and smelting, Dr. William Vernon on crucibles, and Dr. Oliver Pryce on copper sourcing.

BC Burial 49 in situ fitted copper-based bangles found on the lower leg of a 4-5 year-old child. Early-Middle Period.

The monograph is organized in three parts:

  1. A background section on current understanding of metals in prehistoric societies and methods for their study
  2. Presentation of detailed metal evidence from the four sites, including classification, technical analyses, and excavated contexts
  3. Discussion of the larger regional context, including a chapter on copper production evidence by Dr. Vincent Pigott
Bangles from BC Burial 49, cleaned, conserved, and photographed for publication.
The same bangles documented by an archaeological illustrator for publication.
Metal from the bangle under magnification. The microscopic structure makes it clear that the bangle was cast in its final form, without further hammering.

Search metals and metals-related data and images from Ban Chiang, Ban Tong, Ban Phak Top, and Don Klang

Bronze spear point BCES 762/2834. Early Period (2100-900 B.C.)

CERAMICS

BAN CHIANG

CERAMICS ANALYSIS

Modern study of the pottery excavated from Ban Chiang in the 1970s has begun to tell us about the prehistoric social networks and technological communities that produced it.

This iconic Ban Chiang pot is only one of the many elegant shapes and styles of pots recovered from the Ban Chiang excavations.

Surface finds of the famous painted red-on-buff pottery first brought archaeologists’ attention to Ban Chiang in the 1960s. The 1970s Thai Fine Arts Department/Penn Museum excavations unearthed more than 400 prehistoric ceramic vessels, revealing a far wider variety of pottery styles that spanned 2100 B.C. to A.D. 200. Through the millennia, the Ban Chiang ceramics show a strong aesthetic tradition, and many vessels may be considered works of art. Utilitarian vessels also abound, sometimes giving evidence of use such as soot from a cooking fire.

Most of the reconstructible or nearly intact pots were grave goods. The ability to study a large group of nearly complete pots from clear social contexts (human burials at Ban Chiang) is a special opportunity for ceramic archaeologists, who often have only sherds to study from other sites.

In graves of the Early Period (2100-900 B.C.), large pots often held skeletons of infants. Globular, pear-shaped, and open bowl vessels were found in burials of adults and children.
Many large vessels in the Middle Period (900-300 B.C.) had angles in the bodies (carinations), and these pots were often broken over the bodies interred at Ban Chiang.
The Late Period pottery (300 B.C.-A.D. 200) often had red painted designs.

The study of complete ceramic vessels using modern-day approaches is taking us far beyond classification of the shapes and decorations of pots, to reveal much about ancient social groups and ceramic technologies at Ban Chiang and in the region.

Of outstanding note is that distinctive prehistoric ceramic traditions in Thailand were practiced in limited geographic areas. Pottery styles could be different within 25 kilometers (15 miles) of each other…even within the same time period. Other archaeological evidence—e.g. similarities of shell and metal artifacts—shows that there was interaction among these areas, so it was not a matter of physical or social isolation that led to different traditions. Instead, it is as if distinctive pottery styles were used to signal identity of a village or group of villages.

Ceramic subregions of prehistoric Thailand. (White and Eyre 2011)

Read more about related publications from pilot studies of Ban Chiang ceramics:

Glanzman, W.D., and S.J. Fleming
1985 Ceramic technology at prehistoric Ban Chiang, Thailand: fabrication methods. MASCA Journal 3(4):114-121.

McGovern, P.E.
1986 Ancient ceramic technology and stylistic change: contrasting studies from Southwest and Southeast Asia. In Technology and Style, edited by W.D. Kingery, pp. 33-52. Ceramics and Civilization Vol. 2. American Ceramic Society, Columbus, OH.

McGovern, P.E., W.V. William , and J.C. White
1985 Ceramic technology at prehistoric Ban Chiang, Thailand: physiochemical analyses. MASCA Journal 3(4):104-113.

White, J. C., W. V. William, S. J. Fleming, W. D. Glanzman, R. G. V. Hancock, and A. Pelcin
1991 Preliminary cultural implications from initial studies of the ceramic technology at Ban Chiang. Bulletin of the Indo-Pacific Prehistory Association 11:188-203.

Yen, Douglas
1982 Ban Chiang pottery and rice: a discussion of the inclusions in the pottery matrix. Expedition 24(4):51-64.

DOCUMENTING EXCAVATED POTS

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DOCUMENTING EXCAVATED POTS

Documenting the physical characteristics of the ceramics and the social contexts where they were found (mostly graves) was the first step toward understanding the ceramic traditions of prehistoric Ban Chiang.

Documentation of Ban Chiang pots in situ yielded a rich dataset that would not have been possible had pots been removed from the site by looters or untrained excavators before study.

BCES Burial 29 (Early Period). Pot A, one of 3 pots found in this burial, lies at the feet of this female, age 18-22. The sherds seen inside the pot are the rim of the pot, which was later joined to the body during reconstruction.

Precise locations of pots and pot sherds were recorded at the sites excavated in 1974 and 1975. Tens of thousands of site images—black and white photos and Kodachrome slides—recorded excavation contexts, artifacts in situ and the progress of the excavations. Measurement of multiple excavation levels and their contents were documented in hundreds of field drawings.

In early 1976, thousands of bags of sherds and pots, carefully labelled as to provenience, arrived at the Penn Museum for study. There they were painstakingly reconstructed as pots during more than two decades of work by trained volunteers and Penn work-study students.

Volunteers reconstructing Ban Chiang pots in the early 1990s.
Archaeological illustrator drawing actual pot fragment, as well as an outline of the complete pot, extrapolated from measurements of the fragment.

Over that same two decades, pots were documented with carefully measured drawings, involving the skill of many illustrators. Most were Penn work-study students trained in the Ban Chiang lab.

To date, about 500 complete and reconstructed pots from Ban Chiang and three related sites—Ban Tong, Ban Phak Top, and Don Klang—have been photographed and digitally archived.

Publication ready photo of BC Burial 46 Pot A 1608 (Left). Kelsey Halliday Johnson photographing BC Burial 46 Pot A (Right).

The Ban Chiang Project began to computerize site and artifact documentation in the late 1970s using mainframe computing. In the mid-2000s, digitization of images and other records began and the process is still underway today.

Screen shot of ceramics database.

During the Ban Chiang Year of Ceramics, a comprehensive ceramics database was developed for the ceramics of Ban Chiang and three related sites. Under the direction of Dr. Marie-Claude Boileau, more than 130 variables on each of the 500 whole and reconstructed pots were recorded during academic year 2010-2011 and through 2012. Detailed and systematic data such as pot shape, dimensions, color, fabric, as well as forming and finishing techniques became part of the digital record.

(Left) Munsell Soil Color Charts are used to code the color of this pot fragment into the ceramics database. (Center) Thai intern Sureeratana Bubpha compiling data on some reconstructed Ban Chiang pots. (Right) Lao intern, for the Year of Ceramics, Bounheuang Bouasisengpaseuth.

SCIENTIFIC ANALYSES

BAN CHIANG

SCIENTIFIC ANALYSES

Applying scientific techniques to the analysis of archaeological pottery helps us gain a deeper understanding of how ceramic objects were made and used in prehistoric societies.

Dr Marie-Claude Boileau and graduate student Griselle Rodriguez examine a ceramic thin section at high magnification in Penn Museum’s Ceramics Lab, at the Center for the Analysis of Archaeological Materials

When archaeologists study cultures that produced pottery, initial research focuses on classifying excavated ceramic objects and fragments (sherds) into “types”. A pot is defined by a combination of characteristics related to materials used, shape and decoration. Pots that share attributes form a type. Types are then grouped together into a typology which charts change and variation of types over time and provides a chronological sequence for a given archaeological site. Pots made in a specific place and time share decorative types and thus represent a local ‘style’. A typology is a useful starting point to help identify where a particular pot may have been made or if it was traded from another production area.

Scientific analyses go beyond typology to give us deeper insight into the choices that potters made during the production of pots–from the initial choice of raw materials (clays and temper) to the techniques used to form, decorate, and fire the final product. Scientific data gained from these analyses, combined with typological and contextual information (in situ evidence at a site), enrich our archaeological interpretations of the potter’s craft by identifying distinctive potting traditions and networks of exchange between communities.

Among the wide variety of scientific techniques applied to pottery analysis, these are currently being used to enrich our understanding of Ban Chiang pots.

Polarizing microscope used in petrography in the Ceramics Lab at the Center for the Analysis for Archaeological Materials, Penn Museum.

Petrography is an analytical technique that uses polarized light microscopy to examine the minerals and rock inclusions present in a ceramic thin-section. A thin-section is a slice of ceramic, thin enough to transmit light, that is taken from an artifact and mounted on a glass slide. The aim is to match the mineralogy of inclusions to specific geological areas. Petrographic analysis helps identify where ceramic objects were made, thus allowing archaeologists to study networks of interaction between different communities and regions. In addition, ceramic petrography provides data on raw material preparation (i.e. mixing of clays and temper), manufacturing and firing processes by examining the clay groundmass and the shape and sizes of pores. For example, initial petrographic analysis of Ban Chiang thin- sections shows that for some pots, clay was mixed in with rice husks in an effort to prevent shrinkage during drying and firing.

The setup for computed radiography at the Freer/Sackler Gallery of the Smithsonian Institution where a selection of Ban Chiang pots were radiographed

Radiography is a non-destructive analytical technique that reveals the internal structure of objects. Because the techniques ancient potters used to form ancient pots were often masked by the decorative or finishing treatments on their surfaces, radiography provides valuable information about forming techniques not evident to the naked eye. For Ban Chiang, radiographic images obtained with computed radiography helped identify those pots which were made by a combination of techniques, for example a lower body made out of a molded slab and an upper body made of superimposed coils.

Scanning Electron Microscopy (SEM). Dr. Doug Yates, Director, Nanoscale Characterization Facility and Anthropology graduate student Susannah Fishman using the SEM at Penn’s Nanoscale Facility (now in the Singh Center for Nanotechnology).

Scanning Electron Microscopy (SEM) uses a beam of electrons to gain information about a ceramics sample at very high magnification. With EDS (energy dispersive spectrometer) capability, it also provides information about elemental composition. When pots are fired above ca. 900oC, processes of melting (sintering) and fusion (vitrification) start to happen. In sintering, the clay particles begin to stick to each other and proceed to melt and fuse with rising firing temperatures. The fusion stage or vitrification stage brings about a loss of porosity and a densification of the clay body. In the case of Ban Chiang pots, SEM-EDS was used to help identify specific ceramic inclusions, examine slip and paint layers, and revealed that clay particles did not start to melt during the firing process, confirming that Ban Chiang pots were low fired.

Nina Owczarek (Williams Associate Conservator, Penn Museum) demonstrating the use of pXRF to examine Ban Chiang pots, to Penn graduate students

Portable X-Ray Fluorescence (pXRF) is a nondestructive technique used to analyze the elemental composition of materials applied to the surface of pots, such as slips and paints. To date, a small sample of Ban Chiang pots with painted decoration have been analyzed to acquire information about pigments used to produce different colors.

21ST CENTURY DIGITAL ARCHIVE

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21ST CENTURY DIGITAL ARCHIVE

The year 2015 marks the start of our 21st Century Digital Archive Initiative for data, images and records from excavations at Ban Chiang and related sites.

Dr Marie-Claude Boileau and graduate student Griselle Rodriguez examine a ceramic thin section at high magnification in Penn Museum’s Ceramics Lab, at the Center for the Analysis of Archaeological Materials

In the 21st century, establishing a living digital online archive is becoming the best-practice goal of a modern archaeological program. Such an archive, when carefully developed and curated, can contribute to knowledge in perpetuity: original archaeological field data, photos, and other documentation can be digitized, supplemented with ongoing research data and analyses, then re-studied and re-examined as new questions are asked by future scholars. In the age of international collaborative scholarship, a modern online platform is also a must to make archival content accessible, searchable, and downloadable by all global stakeholders.

Thanks to generous support from the Royal Thai Embassy in Washington, D.C., ISEAA has taken initial steps toward our goal of a 21st century Ban Chiang digital archive. In November 2015, we introduced an upgrade/expansion of the online Ban Chiang metals database and related online content. Improvements include database migration to new software, a better user interface, addition of data from recent metals studies, and more photo documentation. Our goal is to provide scholars more comprehensive tools and resources to examine the metal finds from four key archaeological sites in northeast Thailand—Ban Chiang, Ban Tong, Ban Phak Top, and Don Klang.

Interpretation of these sites’ metallurgical data will be presented in the forthcoming monograph in the Penn Museum Thai Archaeology Monograph series: Ban Chiang, a Prehistoric Village Site in Northeast Thailand II: the Metal Remains in Regional Context.

Follow these links to see examples of enhanced Metals and Metals-related data:

METALS DATABASE

IN SITU IMAGES

COPPER ORE SOURCES

PHOTOMICROGRAPHS

SOUTHEAST ASIAN ARCHAEOLOGICAL DIGITAL RESOURCES

Establishing a full online digital archive for Ban Chiang will be a large scale, multi-year project. Much remains to be done to integrate other resources that are currently offline. However, the Ban Chiang Project has been laying the foundation for a modern digital archive since the late 1970s coding of excavated data began. Starting with the skeletal data in 2002, the Ban Chiang Project was the first archaeological project in Southeast Asia to begin open-access sharing of project data online, as part of our Southeast Asian Scholarly Website. We have since expanded online access to other resources.

Access all of our current online Southeast Asian Archaeological Digital Resources, including a comprehensive bibliography, skeletal and metals data, and multilingual archaeological vocabulary.

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