l8 NEW YORK STATE MUSEUM 



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

 at 1 150 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 

 Xaples 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 Leptostrophia perplana var. nervosa 



Atrypa reticularis Linne Hall 



Productella lachrymosa Hall Orthothetes chemungensis Conrad 



P. speciosa Hall Tropidoleptus carinatus Conrad 



P. onusta Hall Liorhynchus mesacostalis Vanuxem 



P. boydi Hall Chonetes scituliis Hall 



Schizophoria impressa Hall Lingula cf. melie Hall 



Orthis tioga Hall Lyriopecten trlcostatus Conrad 



O. carinata Hall Grammysia sp. 



Stropheodonta cayuta Hall Manticoceras pattersoni Hall 



Orthoceras cf. hebryx 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 riffs, 1 mile south of Fillmore where, in a heavy calcareous 

 sandstone the first brachiopods above the ( renesee shales are found. 

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

 appearance of the Chemung fauna with Spirifer d i s j unct u s , 

 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 Xaples 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 Dansvillc, a distance of 25 miles east from Wiscoy, the 



