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A macro-invertebrate fauna from a 7 m elevation terrace remnant on the front of the Newport Mesa contains 63 mollusks, 58 specifically identified. These taxa represent a mixed death assemblage similar to that seen on rocky terrace platforms at intertidal depths in southern to central California today. The extralimital northern bivalve Macoma inquinala (Carpenter) and gastropods Tectura sp., cf. T. persona (Rathke), and Tegula montereyi (Kiener) suggest slightly cooler water temperatures than present today. These extralimital cool-water taxa, along with the terrace's geomorphic position in the palisades along the front of Newport Mesa, below other mapped terraces, separate it from the well known first terrace and its associated warm-water fauna recognized by previous authors, and suggest a younger age than the first terrace around Newport Bay.
Additional Publication Details
Geologic and molluscan evidence for a previously misunderstood late pleistocene, cool water, open coast terrace at Newport Bay, Southern California