GEOLOGY AND PALEONTOLOGY OF THE SCHOHARIE VALLEY 117 



Altamont 40 ft [1 to 2 ft at base may be Rondout] ; Schoharie 

 72 ft; Howes Cave 91 ft. In the sections at Becraft mountain, 

 New Salem, Indian Ladder and Altamont the diminished thick- 

 ness is due to the absence of several members near the base, 

 there being an overlap of the higher members which come to rest 

 on the Lorraine. 



Fig. 26 MonotrypellaV arbusculus 



The more characteristic fossils of these two formations are 

 as follows: 



Corals and hydrocorallines : Favosites helder- 

 bergiae var. p recedens [fig. 7] and S t r o m a t o p o r a 

 cf. antiqua [fig. 22], species which have already been noted 

 under the Cobleskill. 



Brachiopods : Stropheodonta v a r i s t r i a t a [fig. 23] , 

 a small nearly flat species with fine striae which are sometimes 

 strongly alternating, and Spirifer v a n u x e m i [fig. 24], 

 characterized by few but pronounced plications. Two other 

 common fossils are the pteropod Tent a c u 1 i 1 e s g y r a c a n- 

 thus [fig. 25] and the small smooth bivalved ostraeod L e p e r - 

 d i t i a alt a [fig. 24a], which sometimes covers the surface of 

 the slabs. A small branching bryozoan M o n t r y p e 1 1 a ? 

 arbusculus [fig. 2(5] also occurs at times in considerable 

 abundance. 



Description of C a m a r o t o e c h i a s e m Lpl i c a t a (Con- 

 rad) var. a li »• n 1 a 1 a var. now as represented in Hie Transition 

 beds [fig. 27 a-h]. 



