Freshwater invertebrates of early Tertiary age have been collected from eight scattered locations in Presidio and Brewster Counties in Trans-Pecos Texas. Most specimens are internal

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molds of several gastropod genera of Eocene and Oligocene ages. Several specimens of a Paleocene pelecypod genus have been collected. Some small (10-25 mm in length), elliptical objects of uncertain paleontologic classification were found in Eocene, Oligocene, and lower Miocene.

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