GEOLOGY OF THE GENEVA-OVID QUADRANGLES 



19 



The upper limit of this formation is distinctly marked by the 

 Tichenor hmestone that from Onondaga county to Lake Erie is 

 the succeeding- formation and produces a larg'e number of cascades 

 or falls below the top of which the Ludlowville shales are exposed. 



The best exposures of these beds on these quadrangles may be 

 found below the falls in Bloomer and Fall creeks, 2 miles east of 

 Hayt Corners ; along Kendaia creek, on the shores of Seneca 

 lake between Dey landing and the mouth of Indian creek and on 

 Indian creek at the forks. It is finely displayed in the cliflfs along 

 the lake shore from a mile north of Dresden for 4 miles; also in 

 the lower part of the Kashong creek ravine to the top of the middle 

 falls. In New York State Museum bulletin 63, accompanying the 

 stratigraphic and paleontologic map of the Canandaigua-Naples 

 quadrangles the following species are listed as having been found 

 in the basal limestones and succeeding Canandaigua (Ludlowville) 

 shales and which are the essential components of the Hamilton 

 fauna in this region : 



Worms 



Arabellites 



Oenonites 



Ennicites 



Spirorbis angulatus Hall 



Cornulites tribulis Hall 



C. mitella Hall 

 Crustaceans 

 Phacops rana Green 

 Dalnianites boothi (Green) 



D. boothi var. calliteles (Green) 

 Proetus rowi (Green) 



P. macrccephalus 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 



Ostrocodes 



Estlicria pulex Clarke 



Pteropods 



Styliolina fissurella (Hall) 



Hyolithus aclis Hall 



Cephalopods ' 



Orthoceras exile Hall 



O. nuntium Hall 



O. crotalum Hall 



Nautilus liratus Hall 



Tornoceras uniangulare (Conrad) 



Bactrites tenuicinctus (Hall) 



Gastropods 



BcUerophon leda Hall 



B. lyra Hall 



B. acutilira Hall 



Platyceras symmetricum Hall 



P. erectum Hall 



P. conicum Hall 



P. attenuatum Hall 



P. thetis Hall 



P. bucculentum Hall 



P. carinatum Hall 



P. echinatum Hall 



P. subspinosum Hall 



Pleurotomaria capillaria Conrad 



P. itys Conrad 



P. trilix Hall 



P. disjuncta Hall 



P. lucina Hall 



Loxonema delphicola Hall 



L. hamiltoniae Hall 



