Goniophora
Extinct genus of clams found in Silurian to Devonian rocks (the Silurian Period began 438 million years ago and lasted about 30 million years; it was followed by the Devonian, which lasted some 48 million years). Goniophora is characterized by a distinctive shell that is sharply angular. A prominent ridge extends the length of the shell; from it the shell flanks taper away. Fine
posted by TiredKnife @ 3:19 PM
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