4 Scientific Society of San Antonio. 



DESCRIPTION OF LOCALITY. 



The fossils were found about nine feet below the earth's sur- 

 face, near the middle of a low, flat tract of land (see Fig. 1, 



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which is a rough plat of the locality). On the west this flat 

 is bounded by an escarpment of Cretaceous rock, from 200 to 

 300 feet in height and running approximately north and south. 

 About midway between the bottom and the top of the escarp- 

 ment there is an exposure of the Exogyra arietina clay — beds of 

 the Lower Cretacious period, containing the characteristic little 



