GEOLOGY AND PALEONTOLOGY OF THE SCHOHARIE VALLEY 209 



the limestone lies just below the surface and has been taken out 

 for the construction of farm walls, but no exposure is afforded 

 which defines the position of the beds in the rock section."^ It is 

 from these exposures that the fossils credited to the Goniatite 

 limestone of Schoharie, in the Palaeontology of Neto York, were 

 probably obtained. 



Characteristic fossils of the Marcellus beds 

 Among the brachiopods characteristic of the shales is C h o - 

 notes mucronatus [fig. 150] , recognizable by its coarse 

 plications and spines parallel to the hinge line; Stro p ha- 

 lo sia truncata [fig. 151], readily recognized by the small 

 size, strongly convex pedicle 

 valve with truncated apex, and 

 surface covered with faint 

 spines, and slightly concave 



spine-covered brachial valves, ^.^^^^ Chonetes mucronatu 



occurring abundantly in the 



calcareous beds of this formation about Schoharie; and 

 Liorhynchus mysia [fig. 152] , a small shell readily 

 distinguished from other species by its circular form, and few 

 strong plications which reach half way from the margin to the 

 beak, and occurring with the preceding species in the limestone 

 bed in the Upper Marcellus, but generally more numerous than 

 that species. 



Among the pteropods, Styliolina fissurella [fig. 

 153] is the most prominent. It is easily recognized by the minute 

 needlelike form, and the depressed central line in the compressed 

 specimens on the shale. 



The cephalopods are most characteristic of the Agoniatite lime- 

 stone. Orthoceras marcellense [fig. 154] , of slender 

 form with excentric siphuncle and fine concentric surface striae 

 and faint longitudinal ridges, is one of the most characteristic. 

 With this occurs Gomphoceras oviforme [fig. 155] , a 

 small, short (ibreviconic) exogastric species, with large trilobate 



1 Clarke. Loc. cit. p. 123. 



