992 



NEW YORK STATE MUSEUM 



water deposits, but, in the midst of these, thin layers of ferru- 

 ginous conglomeritic sandstones or lumpy mud rock bearing 

 marine fossils occur. No fossils of any kind are found in the 

 red shales of no. 7 and 5. The fossils from the top of no. 7 to 

 the top of the section are all marine with the possible exception 

 of some obscure impressions of plant stems, some of which 

 appear to be calamites, occurring at the top of the Olean 

 conglomerate. 



The most favorable localities for collecting in zones no. 11 

 and 12 are found in the quarries and ravines at Cuba and 

 vicinity and near the mouths of streams entering Ischua creek 

 from Hinsdale to Ischua. In the other zones the best exposures 

 occur and the best opportunities for collecting are found in the 

 quarries and railroad cuttings both north and south of Olean. 

 The Wolf creek conglomerate however has yielded fossils only 

 in loose material in the vicinity of Portville on Wolf creek and 

 on the high hills in the northeastern part of Cuba township. 



LIST OF SPECIES SHOWING ZONAL DISTRIBUTIONS 



DEVONIC 



Chemung beds 

 Zone 12, Cuba sandstone lentil 



(base of section) 



Spirifer disjunctus Sowerby 

 S. mesacostalis Hall 

 Athyris angelica Hall 

 Camarotoechia contracta Hall 

 Orthis (Schizophoria) impressa Hall 



Orthothetes chemungensis Conrad 

 Productella lachrymosa Hall 

 Schizodus rhombeus Hall 

 Grammysia communis Hall 



Zone 11 



Spirifer disjunctus Sowerby 



Athyris angelica Hall 



A. cora Hall 



Camarotoechia contracta Hall 



C. duplicata Hall 



Chonetes scitulus Hall 



Orthis (Schizophoria) tioga Hall 



O. (S.) leonensis Hall 



Cryptonella sp. ? 



Orthothetes chemungensis Conrad 



Productella lachrymosa Hall 



P. costatula Hall 



P. onusta Hall 



P. speciosa Hall 



Aviculopecten ? Hall 



A. cancellatus Hall 



A. rugaestriatus Hall 



A. sp. ? 



Crenipecten crenulatus Hall 



Edmondia subovata Hall 



E. phillipi Hall 



E. obliqua Hall 



Leptodesma potens Hall 



L. potens var. juvensHall 



L. mortoni Hall 



L. sociale Hall 



L. longispinum ? Hall 



L. protextunr ? a ;i7aZZ 



