652 



Report of the State Geologist. 



seventy-five feet in thickness."* .The highest estimate for Montgomery county 

 is that of Vanuxem, also taken by Dana, of 250 feet. Mr. Walcott's diagram, 

 already alluded to, would indicate a thickness of 800 or more feet in this 

 region, but is not a formal estimate. Two hundred and fifty feet is the 

 generally received estimate of the thickness of the Utica slate in Montgomery 

 county. 



The Eva's Kill Section. 



Along the Eva's kill, which empties into the Mohawk river, just west of 

 the Crane's Village station, are numerous exposures of Calciferous sandrock, 

 and about one and one-half miles back of Crane's Village is a small isolated 

 hill just west of the highway, capped by the lower members of the Trenton 

 formation. The section beginning at the level of the Mohawk and extending 

 to the top of the hill is as follows : 



XL V A 1 . Mostly covered. Top consists of massive, thick- m e =w 

 bedded, grey, calcareous sandstone exposed in the bed of the Eva's kill. 

 Ninety feet from river level to base of exposure. 



A~. Partly covered. Heavy bedded, compact, calcareous sand- 6o F = e i5o 

 stone. 



^i 3 . Medium to thin bedded arenaceous limestone with fucoidal ^L 6 *^ 

 markings, especially near the top where the color is dark blue and the 

 weathering very light ash-grey. Contains iron pyrites. From level of Eva's 

 kill to the Manny corners highway, 130 feet. 



A 4 . Mostly covered. Calcareous sandrock exposed at the base 120 F = e 4oo 

 in the road above the Eva's kill and at the top in the side of Quarry hill, 

 where it is thin bedded and mottled, and weathers with rough, jagged surface. 

 Top of Calciferous sandrock. 



A 5 . Dove-colored, with flat conchoidal fracture; disposed in m% 

 thin layers, weathering more unevenly than usual for this limestone. Birdseye. 



A 6 . Dark blue-black, fine grained, lumpy, heavy bedded lime- 9 f%^ 

 stone, containing Columnaria alveohita. This fossil ranges through eight and 

 one-half feet of compact limestone and marks an horizon which varies in 

 thickness from seven to nine feet within the limits of the quarry. 



A 7 . Greyish-blue, semi-crystalline limestone, weathering dark i^f=4ia 

 grey, containing several small specimens of Cohi mmu-in and abundant crinoid 

 segments. In places the rock is filled w ith pebbles of sandrock, which are 

 similar to the Calciferous. 



* Reprint from Canadian Record of Science, October, 1892, p 3. 



