Preliminary study on the preservation of giant clam (Tridacnidae) shells from the Balobok Rockshelter archaeological site, South Philippines

College

College of Liberal Arts

Document Type

Article

Source Title

Geoarchaelogy

Volume

26

Issue

6

First Page

888

Last Page

901

Publication Date

2011

Abstract

Tridacnidae shells, a valuable archive of past environments, are common in the Balobok Rockshelter archaeological site on Sanga-Sanga Island in the south Philippines. This site was occupied during the mid-Holocene (ca. 5000–8800 14C yr B.P.), a period of Neolithic cultural expansion in the Philippines. This paper focuses on the preservation of two shell specimens, Hippopus hippopus and Tridacna maxima, unearthed from two mid-Holocene layers within the rockshelter. The shells’ mineralogy and microstructure (prismatic and crossed-lamellar) were studied using micro-Fourier transform infrared spectroscopy and scanning electron microscopy to determine if the samples were suitable as paleoenvironmental records. Both shells are still aragonitic but aragonite crystals of both microstructure types are partly dis- solved. This dissolution, characteristic of meteoric water alteration, precludes their utility in paleoenvironmental geochemical studies. Nevertheless, these shells are abundant in archae- ological sites in the region and may be better preserved in other depositional contexts; more studies on Philippine Tridacnidae shell diagenesis are needed. © 2011 Wiley Periodicals, Inc.

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Disciplines

Archaeological Anthropology

Keywords

Giant clams—Preservation—Philippines—Balobok Rockshelter

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