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 sjjecies of fossils are listed from this forma- 

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



■f.y 



Fig. 95 Rlilpidomella alsa 



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

 number, 43 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 alsa 

 [fig. 95], distinguished by its long hinge 

 line, more convex brachial valve with de- 

 pression down the center, and bifurcating 

 striae ; S t r o p h e o d o n t a p a r v a 

 [fig. 96], characterized in the mold by 



strong subangular costae, w^hich become grooved and in- 

 creased by intercalation on the lower part ; Leptostro- 

 p h i a p e r p 1 a n a [fig. 97] ; recognized by its flat sur- 

 face, fine striae and diverging depressed lines in the 

 mold of the beak of the pedicle valve ; Strophonella 



Fig. 96 S 1 1- o p li e o d o n t a 

 p a r V a 



