GEOLOGY AND PALEONTOLOGY OP THE SCHOHARIE VALLEY 141 



above the Coeymans cliff about a mile south of Altamont, while 

 other good exposures are found at Indian Ladder, New Salem, 

 Becraft mountain and on North hill near Kingston. 



The thickness of the New Scotland beds in the Schoharie region 

 averages 115 feet. At New Salem it is 120 feet thick ; near Clarks- 

 ville, 127 feet. At Becraft mountain from 70-75 feet occur while 

 at Kingston the thickness is estimated at 100 feet. 



Fossils of the N"ew Scotland beds 



As will be seen from the list of fossils in chapter 7, this 

 formation is one of the richest of the Helderberg series. Only 

 a few of the most typical species can be mentioned. 



-v -;'0'V>V?!SRV;^:,;., 



Fi}^". 40 Rhipidomella oblata 



Brachiopods. Rhipidomella oblata [fig. 40 and 40a.] 

 This species may be recognized by its broadly rounded outline, 

 short hinge area, the greater convexity of the brachial valve and 

 the fine radiating surface striae. It is a common species. 



Dalmanella perelegans [fig. 41] and D. subcari- 

 n a t a [fig. 42] are also characteristic species, and can be dis- 



I tinguished from the preceding by the shallower brachial valve, 

 which generally has a depression down the center, while the 



t pedicle valve is strongly convex. Of the two species the first 

 has a more sloping hinge area and a more strongly convex 

 brachial valve. 



