Fossil Pecten (scallop) - Argopecten abiatis, Pleistocene, San Diego

Description

Argopecten abietis
(Jordan and Hertlein, 1926), middle Pleistocene (~500,000 years old).   This species was formerly classified as
Chlamys abietis
Jordan and Hertlein.   Collected from terrace deposits.  Fossil horizon was about 20-23 feet below ground surface of new Downtown San Diego Central Library construction site located between J and K Streets and 11
th
and 12
th
Streets.  Specimens were collected during October 2010.
This species is an extinct fossil scallop or
Pecten
that lived within the ancestral San Diego Bay which occupied much of the downtown area of San Diego during one of the many interglacial periods between two of the many ice ages that extended back to about 2 or 3 million years ago.  The scallops lived in a subtropical environment during the Pliocene and Pleistocene in southern California and Baja California.
Since the specimens were disarticulated in the deposit, each specimen is not biologically paired.  We provide two unmatched valves that may be of different sizes.
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