STRATIGRAPHY OF MOHAWK VALLEY AND SARATOGA CO. 475 



Feet 



D^ Boulder clay in which are boulders of various 

 sizes. The thickness varies in different parts of the 



quarry from 5 feet, 10 inches to 8 feet. 8=242 1- 



D"^ Soil to top of the quarry. i ^=243-1 



The dip varies in different parts of this quarry from 2° to 5° S, 

 40° to 45°E. The Birdseye limestone does not appear to be 

 represented in this section but it occurs at the eastern end of an 

 old quarry below the highway a mile northwest of the Moore 

 quarry. This is the most eastern outcrop of the Birdseye lime- 

 stone that the writer has seen on the southern side of the Mohawk 

 river. , 



Hoffman fault 



The section on the northern side of the river from Hoffman to 

 the top of Van Epp's hill and the fault have already been described 

 by the writer^ and by Mr Darton.^ The gorge known as Wolf's 

 hollow has been excavated for three fourths of a mile along the 

 line of this fault. At its southern end near the point at which the 

 highway turns to the east the foot wall composed of Calciferous 

 sandstone forms a high cliff, the top of which is 150 feet above the 

 creek level; while on the eastern side is the lower hanging wall 

 of the Hudson river formation. Mr Darton referred the country 

 to the east of the fault to the Utica slate; but at the lower 

 end of the gorge there are heavy sandstone strata alternat- 

 ing with blackish to bluish shales which in Montgomery 

 county mark the Hudson river formation to the lower part 

 of which the writer refers these rocks. In places near the top 

 of the Calciferous cliff, or foot wall, are exposures of Trenton lime- 

 stone and farther up the glen apparently of Utica slate which dips 

 very steeply to the east, having from all appearances dragged on 

 the Calciferous sandrock when the displacement occurred. The 

 fault scarp is again well shown to the north of the glen near the 

 Weatherwax quarry at the corners a mile southwest of Glenville. 

 At this locality 9J feet of Trenton is shown on the eastern side and 

 just to the east of the quarry along the fault scarp 12 feet, 2 inches 

 of this limestone. The direction of the fault to the south of the 



^13th annual report N. Y. state geologist, p. 655-56, section 2A. 

 *14th annual report N. Y. state geologist, p. 49, 50. 



