GEOLOGY AND PALEONTOLOGY OF THE SCHOHARIE VALLEY 107 



tious here see p. 237]. The thickness of the Cobleskill at the 

 latter point is 5 feet and 4 inches according to the measurements 

 made by Mr Hartnagel. Northward from this the Cobleskill can 

 be traced in the hillside and along the road as far as Mix and 

 O'Reilly's quarry at the stone-crusher in the northeastern part 

 of the village [map : XI c, 42]. In none of these places, however, 

 is the rock readily accessible except at the Brown quarry. There 

 are a few other exposures north of the stone-crusher along the west 

 face of East hill, the best one, by far, being that on the hillside just 

 south of Seth Stevens's house at Shutters Corners [map : XHI-i. 

 40]. To reach this, follow the road behind the Stevens house up- 

 hill to where you see on the right a clump of bushes across a field. 

 Here the ledges are found which have yielded the richest collec- 

 tions of Cobleskill fossils, Mr HartnagePs list including 45 species. 

 This investigator concludes that " the appearance of the coral 

 masses in this rock . . . indicates that this was their original 

 place of growth ; and thus a locality favorable for the existence of 

 these types of life . . } He found T r o c h o c e r a s g e b • 

 h a r d i and large gastropods resting on the summit of the coral 

 heads, and that these shells in turn served for the attachment of 

 new corals and coralline growths which often embedded the shells. 

 In the lower portion of the rock is a bed containing an abundance 

 of Chonetes jersey ensis Weller. The characteristic 

 Xiagara trilobite Caljmmene niagar ensis has been 

 found associated with these fossils. 



From the abundance of the corals at this point it seems not 

 unlikely that we have here one of the local coral reefs which 

 have supplied much of the lime-sand and mud from which the 

 main mass of the Cobleskill was built up. In the more evenly 

 stratified portions of the other exposures the corals are more 

 often fragmentary, being worn or dissolved, and rolled about 

 considerably before they were embedded in the lime-sand matrix. 

 It is somewhat surprising that more actual Cobleskill reefs have 

 not been discovered. 



l Loo. cit. p. 1118. 



