CANANDAIGUA AND NAPLES QUADRANGLES 



39 



Thickness from 200 to 225 feet. These beds lie in the horizon of 

 the Wiscoy shales of the Genesee river section, which are beds 

 there overlying the Portage sandstones but still carrying the 

 Portage fauna though somewhat modified in character. There 

 also they are overlain by strata carrying the Chemung fauna 

 which appears first at Long Beards riffs with S p i r i f e r 

 disjunctus. 



The upper part of the Prattsburg beds in the Naples region are 

 light bluish gray sandstones, usually in lentils and compact or 

 uneven layers. The interstratified shales are mostly blue and 

 hard, but black and slaty layers occur frequently. These beds 

 have a thickness of 300 to 400 feet in the higher land of the 

 southern part of the quadrangle. The lower portion, or the 

 equivalent of the Wiscoy horizon, is exposed in a small outcrop 

 on the road leading from Marsh's Corners southward up Pine hill 

 near the top, and a mile still farther east on the road leading from 

 Ingleside to Lent hill is another exposure in approximately the 

 same horizon, from which M antic oceras oxy has been 

 obtained. Whitney's quarry on the southwest side of Pine hill, 

 which has produced a large amount of flagstone laid for sidewalks 

 in the village of Naples and adjoining towns, is in this horizon. 

 It is exposed also along the dugway road leading up Lent hill 

 southwest from Ingleside near the road on the east side of Pine 

 hill, in the Woodworth quarry 2 miles south of North Cohocton, 

 on Lent hill in the ravine west of the Wheaton farm, in the upper 

 part of the Italy gully, and by the roadside 2 miles north of 

 Prattsburg. The upper beds are seen in the Wheaton quarry 

 on the hill south of Atlanta, by the roadside in several places in 

 the vicinity of Lent Hill church and in numerous small outcrops 

 on the high ridge between the Prattsburg valley and Lyons 

 hollow. 



