Abstract
ABSTRACT Microwear studies and experimentation were used to analyze fossil Glycymeris gigantea and Dosinia ponderosa shells from the early human occupation of the Covacha Babisuri rock shelter on Baja California's Espíritu Santo Island. The most abundant fossil Glycymeris gigantea shells appear to have been used by early coastal foragers between 11,000 and 8,000 years ago for hide-working. The use of fossil shells as tools that have been dated between 35,000 and more than 47,500 years ago provides a methodological warning to coastal archaeologists concerning the interpretation of the age and contents of early shell middens around the world.
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