Bishop — Geology of Erie County. 



band crops out near the road to Duel's Corners, crossing the bed of a brook 

 200 yards above the bridge, about half a mile east of Hamburg station. It is 

 here twelve to eighteen inches thick and lies six feet above the layer of 

 pyrites representing the top of the Hamilton shales. The pyrites at this 

 point and at other places eastward, is from two to four inches thick. I was 

 unable to estimate the thickness of the Genesee, as it was partly hidden by 

 drift. 



The Encrinal limestone crops out in Smoke creek near the plank road, a 

 mile north of Webster's Corners, at the top of a fall some thirty feet high. 

 At Spring Brook it crosses Cazenovia creek just below the dam, appearing on 

 both sides of the gorge for a mile below. The thickest portion measured 

 was four feet from top to bottom, with one layer of eighteen to twenty 

 inches. 



The favosite corals here had their cells filled with crude petroleum and 

 other bitumens so that a tablespoonf ul could be scraped with a knife from the 

 surface of a single specimen. 



The Styliola band is well shown for a mile above the dam, having about 

 the same thickness as at Windom. It is here from four to six feet higher 

 than the top of the Hamilton. 



A small exposure of the Encrinal limestone is seen three-fourths of a 

 mile east of Spring Brook station, where a small brook flows under the track 

 of the Western New York and Pennsylvania railroad. It is next found 

 where the covered bridge crosses Buffalo creek, two miles east of Elma. 



The limestone crosses the creek just below the bridge, and is quarried 

 along the bank and on top of the bluff farther down the creek. 



The top of the Hamilton shales dips to the level of the creek, one-third 

 of a mile above the bridge. . The pyrites layer varies from one to four inches 

 thick, and lies five feet below the Styliola band. The latter is six inches 

 thick, representing only the upper part. When the concretionary lower layer 

 appears, as it occasionally does, along the bank, the whole thickness is 

 increased to a foot and the upper part also becomes concretionary. 



The bed of Little Buffalo creek, below Marilla, is filled with drift so that 

 no bed-rock appears. The Encrinal limestone crops out in the bed of a small 

 brook emptying into Cayuga creek on the north side near the town line 

 between Alden and Marilla. It again appears about a mile from Aldeu 

 village, south from the station, where the road passes a wood-lot. The rock 

 has been quarried in a small way near the top of the hill, and an excellent 

 spring issues from beneath an outcrop in the woods on the other side, a few 



