CANANDAIGUA AND NAPLES QUADRANGLES 



55 



C. dotis Hall 

 C. sappbo Hall 



Cryptonella rectirostris Hall 

 Eunella lincklaeni Hall 

 Tropidoleptus carinatus Conrad 



Crinoids 



Nucleocrinus lucina Hall 

 Forbesciocrinus lobatus Hall 

 Calceocrinus clarus Hall 

 Platycrinus eboraceus Hall 



S. tullius Hall c 



S. eatoni Hall 

 Cyrtina baiuiltonensis Hall 

 Anibocoelia mnbonata Conrad. .cc 



Xucleospira concinna Hall c 



Treniatospira birsuta Hall 

 Meristella baskinsi Hall 



Atbyris spiriferoides Eaton cc 



Atrypa reticularis Linne cc 



A. spinosa Hall c 



Caniarotoecbia congregata Conrad 



The contrasts in the faunas of these upper and lower beds are 

 not deep seated. There is in the former as a most striking feature 

 the profuse development of the crinoids associated with an almost 

 equal profusion of Phacops rana, Diaphorostoma 

 1 i n e a t u m and Pentamerella pavilionensis with 

 Product e 11a papulata; in the upper beds lamellibranch 

 species such as Orthonota undulata, parvula, 

 carinata, Phthonia nodocostata, Pholadella 

 r a d i a t a and specially Tellinopsis subemarginata 

 which are rare or absent below. There are also here thin beds 

 wholly composed of Ambocoelia umbonata but on the 

 whole the distribution of the fauna throughout the Moscow shales 

 is quite uniform. 



The Moscow shales are exposed in detail in the ravine at 

 Tichenor point where the succession from the bottom up is 

 essentially as follows : 



At the base the uppermost beds of the Canandaigua shales with 

 Eridophyllum a r c h i a c i , Heliophyllum and other 

 cyathophylloids in abundance. 



Tichenor limestone 



1 Blue calcareous shale with crinoids, Pentamerella 

 pavilionensis, Diaphorostoma lineatum, 

 Phacops rana, 2 feet, passing into a thin limestone 8 inches 



2 Bluish shale with Tropidoleptus carinatus, 30 

 feet 



3 Menteth limestone, 1 to 1J feet 



± Bluish shale with Tropidoleptus carinatus 

 5 Olive shales with Cryphaeus boothi 



