32 



NEW YORK STATE MUSEUM 



the succession is apparently indicated in the western part of the 

 quadrangle by a row of fossiliferous spheric concretions which 

 appear in the Bristol and Honeoye valleys. 



The Cashaqua shale, flags and calcareous beds constitute the 

 principal situs of the fauna of the rocks and their exposures can be 

 studied to best advantage in the admirable outcrops on the east 

 side of the Naples valley, specially in the great Parrish gully at 

 Parrish, the Caulkins gully and other small ravines cutting back 

 into Hatch hill. The rocks are also shown in the face of Hatch hill 

 behind the fair-ground and southward. The west side of this 

 valley also affords some admirable exposures as in the Lincoln 

 gully and thence northward on the western slope of Canandaigua 

 lake in scores of ravines and gullies and along the dugway roads 

 as far north as Cheshire. They are also displayed in the upper 

 parts of all the gullies in Bristol Center southward to nearly 

 the end of the valley and along Egypt brook and its various 

 branches in South Bristol and also in the upper part of Jason 

 gull. In the Honeoye lake valley the decreasing proportion of 

 the arenaceous layers toward the west is noticeable, the shales 

 becoming more calcareous and concretionary. The Briggs and 

 Hamilton gullies near the west line of the map in the Honeoye 

 valley afford particularly favorable outcrops for study. Nearly 

 all the Cashaqua shales are to be seen under specially favorable 

 conditions along the Whetstone brook west of Honeoye village 

 from the Livonia road to the falls at the Devil's Bedroom. East- 

 ward of Naples they are found in Italy hollow at the mouth of the 

 ravine which crosses the road at the Big Tree schoolhouse. In 

 the Middlesex valley they are well seen in the Clark and Mower 

 gullies and also in the Lee, Goodrich and other small ravines 

 farther north toward Middlesex Center. In fact in these high 

 lands of the southern part of the map wherever the relatively 

 thin drift mantle has been transected by streams these beds are 

 brought to light. 



Rhinestreet black shale 



Black slaty shale with a small proportion of blue shale and oc- 

 casionally thin but lenticular sandstones. Thickness 18 feet on 

 the eastern boundary of the quadrangle increasing to 30 feet at 



