Cincinnati Fossils : An Elementary Guide to the Ordivician by R. A. (editor) Davis

By R. A. (editor) Davis

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Additional resources for Cincinnati Fossils : An Elementary Guide to the Ordivician Rocks and Fossils of the Cincinnati, Ohio, Region

Sample text

G e n u s found throughout the C i n c i n n a t i a n ; this species, limited to the Corryville. 23-29 Inarticulate brachiopod. C r o w n to a v a l v e of Kalmcsquina. Brachial v a l v e . N o t e fine striations a n d convexity of valve. Fairmount through Oregonia. Parvohalhpora ramosa. B r y o z o a n . Characterized by high, sharp m o n ticules or by monticules fused into ridges (latter formerly called Hallopora rugosa). Branches relatively thick. Figs. 15 & 16, e n larged. B e l l e v u e through M t .

N o t e faint c o n centric growth lines. 22 Glyptocystites fultonensis. Cystoid. Single plate. N o t e hexagonal ridges. Complete animal unknown. C o m m o n in Edenian and M a y s v i l l i a n ; exact range u n k n o w n . 23 Proetus parviusculus. Trilobite. N o t e large c e p h a l o n a n d glabella, few thoracic segments, small p y g i d i u m , and w i d e , oval outline. Enlarged X 3 . U n c o m m o n . (A similar species, Proetus spurlocki, also o c curs in the local rocks, but is m u c h more rare).

P e l e c y p o d s h a v e t w o v a l v e s , a right a n d a left, joined by a hinge. If the viewer holds a s p e c i m e n so that he is l o o k i n g at t h e h i n g e line, w i t h t h e b e a k f o r w a r d , t h e right v a l v e will be on the valves right, t h e externally are left o n t h e mirror left. T h e s e images of each other, the plane of s y m m e t r y passing b e t w e e n the t w o valves. Shell morphology of the pelecypod Ischyrodonta. In the Cincinnatian, there are only a few c o m mon pelecypods, these 'are unusual.

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