2S4 



Report of the State Geologist. 



There are no other good exposures of the limestone in the eastern part of 

 the county, but at Tinker's falls, just over the line in Cortland county, near 

 Labrador pond, it forms the crest of the fall, which is sixty feet high and 

 projects over the shales beneath in the shape of a crescent, which is eighteen 

 feet wide in the middle. The upper part is hard limestone, mostly rubbly ; 

 the lower ten feet, nearly all shaly. The total thickness exposed is twenty- 

 nine feet, six inches. There is a small outcrop in the southeast corner of the 

 town of Fabius. 



The terrace reappears, though less distinctly seen, on the north side 

 of the Vesper ravine, and continues with one interruption — that of the Otisco 

 creek — to a point about one mile northeast of Otisco centre, where the out- 

 crop on the Kingsley farm is the most westerly exposure in the county. 

 According to Mr. E. B. Knapp, the limestone is twenty-two feet thick, and 

 its altitude 1,500 feet, A. T. 



In the Bucktail ravine, near Spafford Hollow, the Tully limestone is the 

 crest of a high fall, and it is exposed in a small ravine near by. It is also 

 exposed near the highway one mile southeast of Borodino, where it is unusu- 

 ally rich in fossils, one horizon being a crumbling mass of sections of crinoid 

 columns, and orthoceratites a foot long and two inches in diameter occur. 

 The strata here are in a disturbed condition, as though they had been under- 

 mined and had fallen with a sliding movement. The Nunnery schoolhouse, 

 one-quarter of a mile south from this exposure, was built fifty years ago from 

 Tully limestone quarried near by. 



From this point south along the east bank of Skaneateles lake, it appears 

 in several ravines. Where the highway crosses the ravine, above Colonel 

 Jenney's cottage, there is a fall and a vertical exposure where, including a 

 few feet above the bridge, the limestones measure thirty-two feet, ten inches. 

 An excellent exposure for examination is in the dugway road leading up from 

 Spafford landing. An outlier, which is quite extensive, occurs in the hill 

 north of the village of Tully. The limestone is exposed near the mill dam in 

 the bed of the small stream that runs through the village. It would seeiB 

 from the elevation and position of Pompey hill, that the Tully limestone 

 should be found there, but such is not the case. 



Chemung Group. 



"All the rocks of the Genesee epoch and that part of the Portage 

 epoch which includes the lower Black band and the second Black band, 

 as those formations appear in Ontario and Livingston counties, are repre- 



