1122 



NEW YORK STATE MUSEUM 



8 Pterinea securifornris Hall 



9 Orthoceras sp. 



10 Beyrichia sp. 



11 Leperditia cf. jonesi Hall 



The above species so far as they can be determined, are forms 

 which continued their existence from the Cobleskill up into the 

 Rondout, indicating that the change was very gradual. The 

 number of individuals found however is not large. Outside of 

 the corals, Rhynchonella? lamellata and Leper- 

 ditia cf. jonesi are the only species that can be readily 

 obtained. 



The southerly dip of the rocks brings the Cobleskill below the 

 Schoharie valley, a short distance south of Vroman's quarry, but 

 on the west bank of Schoharie creek, south of the bridge, it 

 reappears together with the Salina and affords nearly a complete 

 vertical section of these shales. The Cobleskill is exposed for 

 its entire thickness, but is unfavorable for collecting. 



One third of a mile north of the creek bridge at Clarke's cave, 

 there is exposed a good section extending from the Lorraine 

 shales to the Manlius limestone. From the Cobleskill there were 

 obtained 



1 Favosites niagarensis ? Hall 



2 Leptaena rhomboidalis Wilck. 



3 Orthothetes interstriatus Hall 



4 Rhynchonella ? lamellata Hall 



5 Spirifer crispus var. corallinensis Grabau 



6 Stropheodonta textilis Hall 



From the limestone layer above the cement bed of the Rondout 

 at Clarke's cave the following species were obtained. 



1 Favosites niagarensis ? Hall 



2 Orthothetes interstriatus Hall 



3 Rhynchonella ? lamellata Hall 



4 Spirifer crispus var. corallinensis Grabau 



5 Whitfieldella nucleolata Hall 

 G Pterinea cf. securiformis Hall 



7 Gastropod sp. 



This fauna so far as it can be identified is made up entirely 

 of Cobleskill species. 



