34 Report of the State Geologist. 



■ 



Poteriocrinus sp. 



B, ;i short distance above, exposes aoout fifteen feet of a sandy shale with 

 Schizophoria impressa, very large and highly convex: abundant. 

 Atrtjpa reticularis, as above ; common. 

 Spirifer m/ucronatus, small variety, as above. 

 Leptostroph/ia per pi ana var. nervosa. 



This shell is somewhat smaller and of less irregular form than in its 

 occurrence in the Chemung of the southwesterly counties. This difference in 

 the early and later forms of this variety has already been adverted to by 



VllilRE 1. 



Professor H. S. Williams, who speaks of the Chemung form as the "coarser 

 and more irregular." 



TentacuUtes spirt// us. 



Actinopteria eta, common. 



At C and C 1 , fifty feet higher, are two exposures of sandy shale separated 

 by about six feet. 



Schizophoria impressa, as above; common. 

 Atrypa reticularis, as above; common. 

 Productella speciosa, common. 

 Actinopteria eta. 

 Microdon gregarvm. 

 Spatjulla tt/pira. 

 Gravuiujsia clliptica. 



Belhu-ophon Ma era. This shell is somewhat smaller than the usual form 

 of the Chemung fauna, and its surface pustules do not always extend to the 



