GEOLOGY OF THE GENEVA-OVID QUADRANGLES 



19 



The upper limit of this formation is distinctly marked by the 

 Tichenor limestone that from Onondaga county to Lake Erie is 

 the succeeding formation and produces a large 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 cliffs 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 



Cephalopoda 



Arabellites 



Orthoceras exile Hall 



Oenonites 



0. nuntium Hall 



Eunicites 



0. crotalum Hall 



Spirorbis angulatus Hall 



Nautilus liratus Hall 



Cornulites tribulis Hall 



Tornoceras uniangulare (Conrad) 



C. mitella Hall 



Bactrites tenuicinctus (Hall) 



Crustaceans 



Gastropods 



Phacops rana Green 



Bellerophon leda Hall 



Dalmanites boothi (Green) 



B. lyra Hall 



D. boothi var. calliteles (Green) 



B. acutilira Hall 



Proetus rowi (Green) 



Platyceras symmetricum Hall 



P. macrccephalus Hall 



P. erectum Hall 



Cyphaspis ornata Hall 



P. conicum Hall 



C. ornata var. baccata Hall & Clarke 



P. attenuatum Hall 



C. craspedota Hall & Clarke 



P. thetis Hall 



Turrilepas devonica Clarke 



P. bucculentum Hall 



T. squama Hall & Clarke 



P. carinatum Hall 



T. nitidula Hall & Clarke 



P. echinatum Hall 



T. foliata Hall & Clarke 



P. subspinosum Hall 



T. tenera Hall & Clarke 



Pleurotomaria capillaria Conrad 



Schizodiscus capsa Clarke 



P. itys Conrad 



Ostrocodes 



P. trilix Hall 



Estheria pulcx Clarke 



P. disjunct a Hall 



Pteropods 



P. lucina Hall 



Styliolina fisstirclla (Hall) 



Loxonema delphicola Hall 



Hyolithus aclis Hall 



L. hamiltoniae Hal! 



