Welcome to Pofatu*

*Proto Eastern Polynesian for “stone”

An open-access database for geochemical sourcing of archaeological materials.

Geochemical fingerprinting of artefacts and sources is an effective way to use material evidence in order to reconstruct strategies of raw material procurement, exchange systems, and mobility patterns among past societies. In order to facilitate access to this growing body of data and to promote comparability and reproducibility in provenance studies, we designed Pofatu, the first online and open-access database presenting geochemical compositions and contextual information for archaeological sources and artefacts. The data repository includes a compilation of geochemical data and supporting analytical metadata, as well as the archaeological provenance and context for each sample. Information related to sources and artefacts can be accessed on this platform and downloaded from Zenodo or GitHub.

Two huge piles of dark stone flakes, associated with a shrine in background, resulting from the manufacture of stone adzes at the high-altitude quarry at Mauna Kea, Hawai'i. (Photo credit: Marshall Weisler)

Geochemical sourcing and long-distance voyaging among Pacific Island societies.

Archaeologists use provenance studies to uncover the origin and the life-history of artefacts, including those that are sometimes found very far away from their source or place of manufacture. To this end, reliable archaeometric data facilitates the reconstruction of technological, economic, and social behaviours of human societies over many thousands of years. In the Pacific region, geochemical sourcing has been particularly successful at locating sources of stone artefacts among the thousands of islands in the Pacific Ocean.

Provenance studies are also instrumental in showing how specific high-quality resources, extracted and transformed in large scale quarries and workshops such as Mauna Kea on Hawai'i Island, Tataga Matau on Tutuila Island (American Sāmoa), or the ‘quarry-island’ of Eiao Island in the northern Marquesas (French Polynesia), were distributed among neighbouring communities and through long-distance interisland exchange networks. The discovery of these tools far from their places of origin indicate long-term inter-archipelago interactions, as well as wealth economies and extensive political alliances in the highly hierarchical chiefdoms of Hawai'i, Tonga, and the Society Islands. Such material evidence of long-distance inter-island voyaging shows that Pacific island societies were never completely isolated from one another, and these patterns of interaction are central to our understanding of the deeply intertwined historical trajectories of Pacific Island societies.

Archaeological mapping and excavations at the entrance of the Tanataetea quarry in Tupua'i, Austral Islands. (Photo credit: Aymeric Hermann)_

Open data for a collective, collaborative, and open science.

Pofatu is the first open-access database of geochemical compositions and contextual information for archaeological sources and artefacts in a form readily accessible to the scientific community. As such, Pofatu is an operational framework that enables data curation and data sharing in archaeometry, following the FAIR principles. Additionally, the database provides comprehensive methodological metadata (instrumental details, analytical procedures and reference standards used for calibration purposes and quality control) and therefore ensure reproducibility and comparability between provenance studies. Because it is open access, enables reproducibility, and facilitates reuse of existing data, Pofatu will be useful for crediting previous work while advancing future studies in archaeological sciences. The database uses GitHub for collaborative, versioned data curation and common non-proprietary file formats (CSV) to enable transparency and built-in reproducibility for future studies of prehistoric exchange. The quality control of each new dataset consists in a peer review process that includes qualitative and quantitative data review and users feedback.

Stone flakes glistening in the sun on Eiao the ‘quarry-island’, Henua 'Enana, Marquesas Islands (Photo credit: Jean-François Butaud)_

A tool for interdisciplinary research.

Since most prehistoric quarries and surface procurement sources used in the past have yet to be identified, provenance studies in archaeology must also integrate wide and reliable geological data. For this reason, we advise Pofatu users to also consult other open-access repositories focusing specifically on geological samples, such as GeoRoc and EarthChem. Simultaneously, the Pofatu Database can be used by geologists as a complementary source of information because it contains geographical and geochemical data on geological outcrops, secondary deposits and raw materials extracted in prehistoric quarries from some of the most remote and isolated places on the planet. In that sense, Pofatu is a tool that will also facilitate interdisciplinary research as part of a growing geoinformatics network.


Work on Pofatu is supported by CNRS and Max-Planck-Gesellschaft.