Pottsville Fauna of Ohio
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1, p. 23, PL 2, Fig. 20.
Coal Measures: Springfield, Illinois; 12 miles nw. Of Springfield, Missouri.
Description. Specimens of an Orbiculoidea are abundant in the black bone shale on the Sharon ore horizon and have been referred with some doubt to Orbiculoidea capuliformis. They show consider- able variation in size, ranging from those 6 mm. In diameter to forms which are relatively large; the outline of both valves is circular. The beak of the dorsal valve is slightly posterior to the center;... as the speci- mens are greatly flattened, it is possible only to make conjectures con- cerning the convexity, which seems to have been moderate. The ventral valve is also compressed, some specimens showing a slightly convex region surrounding the almost centrally located beak, the valve becoming concave toward the margins; a deep, broad slit extends from the beak posteriorly to a point about two-thirds the distance from the beak to the margin; slit widest in the central portion. The sur- face is marked by numerous fine, concentric striae which are regularly arranged; on a few forms very faint radiating markings are visible.
What to read after Pottsville Fauna of Ohio?
You can find similar books in the "Read Also" column, or choose other free books by Helen Morningstar to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
1, p. 23, PL 2, Fig. 20.
Coal Measures: Springfield, Illinois; 12 miles nw. Of Springfield, Missouri.
Description. Specimens of an Orbiculoidea are abundant in the black bone shale on the Sharon ore horizon and have been referred with some doubt to Orbiculoidea capuliformis. They show consider- able variation in size, ranging from those 6 mm. In diameter to forms which are relatively large; the outline of both valves is circular. The beak of the dorsal valve is slightly posterior to the center;... as the speci- mens are greatly flattened, it is possible only to make conjectures con- cerning the convexity, which seems to have been moderate. The ventral valve is also compressed, some specimens showing a slightly convex region surrounding the almost centrally located beak, the valve becoming concave toward the margins; a deep, broad slit extends from the beak posteriorly to a point about two-thirds the distance from the beak to the margin; slit widest in the central portion. The sur- face is marked by numerous fine, concentric striae which are regularly arranged; on a few forms very faint radiating markings are visible.
What to read after Pottsville Fauna of Ohio?
You can find similar books in the "Read Also" column, or choose other free books by Helen Morningstar to read onlineMoreLess
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