GEOLOGY OF THE AUBURN-GENOA QUADRANGLES 3 1 



On the Genoa quadrangle exposures are less favorable, and the 

 beds apparently less fossiliferous. 

 The collector may expect to find : 



Stictopora meeki Nicholson Liorhynchus mesacostale Hall 



Aulopora sp. Buchiola retrostriata (von Buck) 



Spirifer mesacostalis Hall Microdon bellistriatus Hall 



S. mesastrialis Hall Schizodus chemungensis Hall 



Cyrtina hamiltonensis Hall Modiomorpha subalata var. chemung- 

 Leptostrophia perplana var. nervosa ensis Hall 



Hall Nucula diffidens Hall 



L. mucronata Hall Palaeoneilo constricta (Conrad) 



Prodnctella speciosa Hall P. filosa {Conrad) 



Ambocoelia umbonata (Conrad) Grammysia subarcuata Hall 



Schizophoria impressa Hall • Spathella typica Hall 



Pugnus piignax Martin Bellerophon leda Hall 



Camarotoechia eximia Hall Orthoceras bebryx z'ar. cayuga Hall 



Cryptonella eudora Hall Gomphoceras tumidum Hall 



Atrypa reticularis Liiuie Bactrites aciculum {Hall) 



Chonetes scitiilus Hall Plumalina plumaria Hall 

 C. lepidus Hall 



There are good exposures of these beds along Trumansburg creek 

 from }i 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. 



