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.  Discovery and analysis of 43 pearl oyster (Pinctada mazatlanica) artifacts and associated shell-processing tools from middle and basal levels of Covacha Babisuri, a rock shelter on Espíritu Santo Island, Baja California Sur, provide evidence of Early and Middle Holocene fishhook production along the southern Gulf of California coast. AMS 14C analysis of a fishhook preform recovered from the lowest stratum of the rock shelter returned a date of 8380 ± 50 RCYBP (Beta-236254), or 8750–8500 cal BP, with a reservoir effect of 250 ± 20 years, making this artifact one of the earliest known examples of a shell fishhook in the world. An additional pearl oyster artifact was found in a deeper level dating closer to 10,000 RCYBP, suggesting that this type of fishhook may date to this earlier period.

Early Holocene Pearl Oyster Circular Fishhooks and Ornaments on Espíritu Santo Island, Baja California Sur