Fossil Pecten (scallop) - Oppenheimopecten vogdesi, Pleistocene, San Diego RARE

Description

Oppenheimopecten vogdesi
(Arnold, 1906), middle Pleistocene (~500,000 years old).  This species was formerly classified as
Pecten vogdesi
Arnold, 1906.  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 a 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 similar to that for scallops living today along the Gulf of California near Mazatlan, Mexico.
This species is very rare in the fossil record of southern California and no longer found, since outcrops have been destroyed or covered by urban development.   Since the specimens were disarticulated in the deposit, each specimen is not biologically paired.  We matched the valves as closely as possible.
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