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TrigonidBivalve

Image of spiralians

Description:

Summary[edit] Description: English: Trigonia sp. from the Glen Rose Formation (Cretaceous) near Austin, Texas. Scale bar is 10 mm. Date: 19 August 2008. Source: Own work. Author: Wilson44691English: Photograph taken by Mark A. Wilson (Department of Geology, The College of Wooster).[1].

Source Information