REPORT OF THE STATE PALEONTOLOGIST 1902 112o 



From Clarke's cave passing north along the eastern face or 

 West mountain, the Cobleskill is obscured almost entirely by the 

 great amount of talus, and about the only exposure is at the 

 Strontianite mine, 1 mile north of Clarke's cave. Farther along, 

 at the northeast point of West mountain, the Cobleskill is again 

 partially exposed, and here the following species were collected. 



1 Favosites niagarensis ? Hall 



2 Orthothetes interstriatus Hall 



3 Khynchonella ? lamellata Hall 



4 Spirifer crispus var. corallinensis Graham 



5 Stropheodonta textilis Hall 



6 Whitfieldella nucleolata Hall 



7 Ilionia sinuata Hall 



8 Tellinomya aequilatera Hall 



9 Murchisonia ? obtusa Hall 



10 Pleurotomaria ? subdepressa Hall 



11 Spirorbis sp. 



12 Trochoceras gebhardi Hall 



13 Gyroceras sp. 



14 Oncoceras expansum Hall 



15 Orthoceras sp. (large) 



16 Phragmoceras corallophilum Clarke 



17 Beyrichia (2 species) 



18 Leper ditia jonesi Hall 



19 L. scalaris Jones 



These specimens, as shown by the texture of the rock, are from 

 the top or transitional layer of the Cobleskill. Here were found 

 several specimens of Phragmoceras corallophilum 

 Clarke, and associated with them were several species of gastro- 

 pods and cephalopods and a very large brachiopod, all forms 

 which had not before been observed from the Cobleskill. They 

 are however too obscure to warrant even generic characters to 

 be assigned to them. Several specimens of Leperditia 

 scalaris Jones, were found at this station. These specimens 

 exhibit in their left valves a nodule or dorsal " hump," while the 

 right valves are without it. These and other features present 

 show that these specimens are identical with L. scalaris 



