GEOLOGY AND PALEONTOLOGY OP THE SCHOHARIE VALLEY 



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Altamont 40 ft [1 to 2 ft at base may be E-ondout] ; Scbobarie 

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

 New Salem, Indian Ladder and Altamont the diminisbed 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. 20 Monotrypella? arbusculus 



The more characteristic fossils of these two formations are 

 as follows: 



Corals and hydrocorallines : Favo sites helder- 

 b e r g i a e var. p r e c e d e n s [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 

 un.der the Cobleskill. 



Brachiopods : S t r o p h e o d o n t a 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 S p i r i f e r v a n u x e m i [fig. 24], 

 characterized by few but pronounced plications. Two other 

 common fossils are the pteropod Tentaculites gyracan- 

 t h u s [fig. 25] and the small smooth bivalved ostracod Leper- 

 ditia alta [fig. 24a], which sometimes covers the surface of 

 the slabs. A small branching bryozoan Monotrypella? 

 arbusculus [fig. -26] also occurs at times in considerable 

 abundance. 



Description of Camarotoechia semiplicata (Con- 

 rad) var. a n g u 1 a t a var. nov. as represented in the Transition 

 beds [fig. 27 a-h]. 



