The Fauna of the Keyser Member of the Berg Formation in Maryland: A Dissertation Submitted to the Board of University Studies of the Johns Hopkins ... of Doctor of Philosophy (Classic Reprint) - Softcover

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Excerpt from The Fauna of the Keyser Member of the Berg Formation in Maryland: A Dissertation Submitted to the Board of University Studies of the Johns Hopkins University, in Conformity With the Requirements for the Degree of Doctor of Philosophy

The vascular area of the ventral valve occupies a comparatively greater space than in shells of 0. Oblata from the Helderberg, and it is more elongated or triangular in form. In the dorsal valve, the double imprints of the adductor muscles are well preserved. Hall, 1859.

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