GEOLOGY AND PALEONTOLOGY OF THE SCHOHARIE VALLEY 181 



Becraft mountain 150 to 200 feet of strata, lithically similar 

 to the Esopus, but more cleaved, are referred to the Schoharie 

 formation, since some of the characteristic fossils have been found 

 in them. 



Fossils of the Schoharie grit 



In chapter 7, 123 species of fossils are listed from this forma- 

 tion. Of these 103 species have been found in the Schoharie 



Fig. 95 R a i p i d o m e 1 1 a a 1 s a 



region, the remainder being from Albany county. Of the total 

 number, 13 pass upward into the Onondaga and sometimes 

 higher, leaving a total of 77 species confined to this horizon. Of 

 these the mollusks are the most striking, particularly the cephalo- 

 pods, of which a total of 43 species are in- 

 cluded in the list. 39 of which have not 

 been recorded from higher horizons. 



Among the brachiopods the following 

 may be noted : Rhipidomella a 1 s a 

 [fig. 95], distinguished by its long hinge 

 line, more convex brachial valve with de- 

 pression down the center, and bifurcating 



si riae; S t r o p h e o d o n t a parva Fig. 96 stropheodonta 



pa r v a 



[fig. 1)0], characterized in the mold by 



strong subangnlar costae, which become grooved and in- 

 creased by intercalation on the lower part; Leptostro- 

 phia perplana [fig. 97]; recognized by its Hat sur- 

 face, tine striae and diverging depressed lines in the 

 mold of the beak of the pedicle valve; St r o ]> li o noil a 



