CANANDAIGUA AND NAPLES QUADRANGLES 



47 



phase of transition from the condition of the black sediments to 

 those of shallower and clearer water deposit, the fauna is also 

 mixed and transitional. It contains: 



Phacops rana Green rr Chonetes setiger Hall c 



Styliolina fissurella Hall c j Spirifer mucronatus Conrad r 



Fleurotomaria rugulata Hall.... c Ambocoelia umbonata Conrad.... c 



Lunulicardiuin curtmn Hall r Liorhynchus liniitaris Yanuxcm. c 



Nuculites oblongatus Conrad. .. . c L. nmlticosta Hall c 



Canandaigua shale and limestone 



With these beds begins the profuse development of the cal- 

 careous Hamilton shales. Though the rocks of this stage are 

 treated as a unit on the map their faunas may be here con- 

 sidered in two divisions, that of (1) the Oenterfield limestones 

 or the calcareous beds at the base, (2) the upper division or the 

 Canandaigua shales. 



1 In the Centerfield limestones, best developed on Shaffer 

 creek and underlying all the northern part of the village of 

 Canandaigua, the following species have been noted: 



Worms 



Arabellites r 



Oeuonites r 



Eunicites r 



Spirorbis angulatus Hall c 



Cornulites tribulis Hall r 



Crustaceans 



Phacops rana Green cc 



Dahnanites boothi Green cc 



D. bootbi var. calliteles Green. . . cc 



Proetus rowi Green cc 



P. macrocephalus Hall 

 Cyphaspis ornata Hall 

 C. ornata var. baccata Hall & 

 Clarke 



C. craspedota Hall & Clarke 

 Turrilepas devonica Clarke 

 T. squama Hall & Clarke 

 T. nitidula Hall & Clarke 

 T. foliata Hall & Clarke 

 T. tenera Hall & Clarke 

 Schizodiscus capsa Clarke 



Gastropods 

 Bellerophon pelops Hall 



Cyrtolites mitella Hall 



Platyceras auriculatuin Hall.... c 



P. symmetricuni Hall c 



P. thetis Hall c 



F. subspinosurn Hall 

 Pleurotoniaria itys Hall 

 P. lucina Hall 



P. disjuncta Hall r 



Loxoiienia delphicola Hall 

 L. hamiltoniae Hall 



Lamellibranehs 



Mytilarca oviforniis Conrad c 



Microdon bellisfriatus Conrad 

 Conocardium crassifrons Conrad 

 Cypricardinia indenta Conrad... c 

 Actinopteria decussata Conrad. . c 

 Aviculopecten princeps Conrad. . c 



Lingula leana Hall r 



L. densa Hajl 

 Crania crenistria Hall 



Craniella hamiltoniae Hall c 



Rhipidomella penelope Hall c 



Brach iopods 

 li. vanuxemi Hall c 



