On a New Exogyra From the Del Rio Clay And Some Observations On the Evolution of
On a New Exogyra From the Del Rio Clay And Some Observations On the Evolution of
Emil Bse
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32, fig. 1; pi. 33, fig. 5; pi. 34, fig. 1; pi. 36, fig. 6. 12 University of Texas Bulletin venile stages of Ex. Ferox have been found and described. The species was found in the so-called lower Cross Timber (Woodbine) sands, which correspond in age probably to the Buda limestone; at least, they also belong in their lower part to the upper Cenomanian. It is difficult to say to what group belongs the form cited by Cragin 1 as Ex. Columbella Meek. It certainly has noth- ing to do with the type of... that species. The specimen which came from the lower Cross Timber sands of Timber Creek, two miles below the Dallas-Lewisville Road, Denton County, is so much corroded that the surface appears nearly smooth, but on close inspection one can easily see that it had been covered by thick, rounded, rather strong ribs. It might be a very young individual belonging to the group of Ex. Clarki. From the next higher beds, the Eagle Ford shales, which correspond to the Turonian, very few fossils have been de- scribed in Texas, and among these only one Exogyra is cited under the name of Ex.
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