274 



Repokt of the State Geologist. 



Patrick Knox, East Onondaga, ....... 50 Cords, 



L. C. Dorwin, Dorwin Springs, " 



T). McNeil, Street's quarry, Onondaga hill, . . . 1500 " 

 John Kearny, North of Onondaga hill, .... 200 " 

 Solvay Process Co., Split Rock, " 



Oriskany Sandstone. 



The line of separation between the top of these limestone beds and 

 the base of the superjacent formations, is very distinctly marked. A 

 thin seam of arenaceous brownish shale, or soft sandstone, which weathers 

 out and crumbles away on exposure, separates the tine dark limestones from a 

 bed of coarse, light grey, sometimes pinkish sandstone, which is nodular in the 

 lower two or three inches, and usually has flattish pebbles of dark rock 

 embedded in it, but is compact above. In some localities it is well cemented 

 and durable, at others it turns dark-colored and crumbles easily. Its position 

 in the escarpment is well toward the top, and generally only the edge of the 

 layer is exposed. 



At Manlins, the lower fourteen inches of a layer two feet, three inches 

 thick, is characteristic Oriskany, gradually changing to a calcareous sandstone 

 and then to a pure blue-grey limestone, identical in appearance with the 

 overlying Onondaga limestone. At Alvord's quarry southwest from James 

 ville, it is a layer of friable sandstone, weathered to dark brown. At Britton 

 & Clark's and at Russell's, it is substantially the same as at Manlius. It is 

 exposed, and large loose blocks abound, on the side of the hill a short distance 

 southwest from L. C. Dorwin's quarry, one mile south of Onondaga valley. 



Here it is a pure sandstone, very light grey with a pink shade, containing 

 many impressions of fossils, Spirit) i- arenosus largely predominating. The 

 stratum is here four to four and one-half feet thick. In the Street quarry 

 north of Onondaga hill, it appears at the w est end as a coarse conglomerate 

 about six inches thick. At Split Rock, there is but a trace of it in the seam 

 of nodular calcareous shale which separates the blue lime from the grey beds. 



At Walker's quarry, Marcellus falls, a layer of granular limestone 

 five feet, three inches thick, is arenaceous toward the bottom, the lower 

 four inches being characteristic Oriskany. The whole layer is brownish 

 grey after exposure It is very remarkably developed in the northern part 

 of the town of Skaneateles, on fche ridge east from Marysville. It is well 

 exposed above Corrigan's quarry as an unusually clean sandstone, very light 



