GEOLOGY OF THE AUBURN-GENOA QUADRANGLES 



31 



On the Genoa quadrangle exposures are less favorable, and the 

 beds apparently less fossiliferous. 

 The collector may expect to find : 



Stictopora meeki Nicholson 



Aulopora sp. 



Spirifer mesacostalis Hall 



S. mesastrialis Hall 



Cyrtina hamiltonensis Hall 



Leptostrophia perplana var. nervosa 



Hall 

 L. mucronata Hall 

 Productella speciosa Hall 

 Ambocoelia umbonata {Conrad) 

 Schizophoria impressa Hall 

 Pugnus pugnax Martin 

 Camarotoechia eximia Hall 

 Cryptonella eudora Hall 

 Atrypa reticularis Linne 

 Chonetes scitulus Hall 

 C lepidus Hall 



Liorhynchus mesacostale Hall 

 Buchiola retrostriata {von Buck) 

 Microdon bellistriatus Hall 

 Schizodus chemungensis Hall 

 Modiomorpha subalata var. chemung- 

 ensis Hall 

 Nucula diffidens Hall 

 Palaeoeilo constricta {Conrad) 

 P. filosa {Conrad) 

 Grammysia subarcuata Hall 

 Spathella typica Hall 

 Bellerophon leda Hall 

 Orthoceras bebryx var. cayuga Hall 

 Gomphoceras tumidum Hall 

 Bactrites aciculum (Hall) 

 Plumalina plumaria Hall 



There are good exposures of these beds along Trumansburg creek 

 from ^ mile below the Lehigh Valley Railroad bridge to half a mile 

 west of the village. The lower beds may be seen along Taghanic 

 creek below Halseyville, and 15 feet of fossiliferous shale are ex- 

 posed below the dam at Waterburg. 



There are a few field outcrops of Hatch flags on the ridge between 

 the Cayuga lake and Salmon creek valley, and along the east line of 

 the quadrangle, but they are all small and insignificant. 



Grimes sandstones 



In the Naples quadrangle the Hatch shales and flags are terminated 

 by the Grimes sandstones, a well defined formation composed princi- 

 pally of thick sandstones in which several species, members of the 

 Ithaca fauna and mostly brachiopods, make their first appearance, 

 making the formation important paleontologically as well as strati- 

 graphically. 



The Grimes sandstones are not exposed on this quadrangle but their 

 position is approximately indicated from exposures at the west and 

 south. 



