lo NEW YORK STATE MUSEUM 



A. T. ; the Doane quarry at 940 feet A. T. and near Sullivanville 

 at 1 1 50 feet A. T. 



In respect to fossils the calcareous lenses which are composed 

 wholly of brachiopods are found at several exposures of this forma- 

 tion and at different horizons. The shales also contain a few brachio- 

 pods and rarely a species which is elsewhere represented in the 

 Naples fauna but very few of those which give the High Point 

 fauna in the Naples region its distinctive character. The more 

 common species are the following: 



Spirifer mesastrialis Hall 

 Atrypa reticularis Linne 

 Productella lachrymosa Hall 

 P. speciosa Hall 

 P. onusta Hall 

 P. boydi Hall 

 Schizophoria impressa Hall 



Leptostrophia perplana var. nervosa 



Hall 

 Orthothetes chemungensis Conrad 

 Tropidoleptus carinatus Conrad 

 Liorhynchus mesacostalis Vanuxem 

 Chonetes scitulus Hall 

 Lingula cf. melie Hall 



Orthis tioga Hall \ Lyriopecten tricostatus Conrad 



O. carinata Hall I Grammysia sp. 



Stropheodonta cayuta Hall ! Manticoceras pattersoni Hall 



\ Orthoceras cf. bebryx Hall 



Prattsburg shale 



These are soft olive or bluish shales with thin blocky sandstones 

 and occasional layers of compact blue sandstone. Together they 

 attain a thickness of 250 feet. 



In the Genesee river section above the typical Portage sandstones 

 are strata to which the above description applies, exposed in the 

 ravine at Wiscoy and in ravines on the east side of the river to Long 

 Beards rift's, i mile south of Fillmore where, in a heavy calcareous 

 sandstone the first brachiopods above the Genesee shales are found. 

 That is to say, the Long Beards riffs sandstone indicates the earliest 

 appearance of the Chemung fauna with Spirifer disjunct us, 

 no evidence of the Ithaca fauna being present in that section. This 

 Wiscoy shale in the typical locality contains a few species of lamel- 

 libranchs and goniatites which are common to the Naples fauna 

 below the Portage sandstones. The Wiscoy shale may be traced 

 westward to Lake Erie showing but little change in lithologic char- 

 acter and fauna, but eastward the fauna is more arenaceous and 

 south of Dansville, a distance of 25 miles east from Wiscoy, the 



