656 



Report of the State Geologist. 



feet and eleven inches of grey crystalline limestone (Trenton), underlaid by 

 two and one-half inches of limestone weathering ash white (Black river?), 

 then seven inches of crystalline rock (Trenton), and finally, at the base, three 

 and one-half feet of compact light- weathering limestone. In the field on the 

 west side of the road and opposite a farm house, a short distance beyond the 

 exposures of No. 3, are exposed at the top eight inches, in two thin layers, of 

 rather coarse grained, semi-crystalline limestone, containing fragments of 

 brachiopods, trilobites and crinoids. Below this is one foot, in thin layers, of 

 fine grained, drab-grey limestone, weathering ash white and apparently barren 

 of fossils. The basal layer is bluish-drab to grey, coarser grained, and has a 

 thickness of four inches. Five feet above the top of this exposure, and a 

 slmrt distance east of it are five feet of crystalline highly fossiliferous lime- 

 stone. These five feet of rock should be added to the twenty-five feet seen in 

 the fault line, as it is a representative of layers not shown in the latter place. 

 Trenton, with possibly Black river at base. 



A 5 . Black, calcareous shale seen mainly as small brown-weathered ^ F = e e ir , 

 fragments in the side of Van Epps hill ; in only a few places is evidence of 

 stratification preserved. U tica slate. 



This section has been carefully studied by field parties from Union 

 College, and the measurements above given have been compared with those 

 obtained on several such excursions, so that they may be considered to possess 

 a fair degree of accuracy. This section, it will be noticed, gives 350 feet of 

 Calciferous sandrock measured in an almost vertical ascent. As the gneiss is 

 not brought up here, the total thickness of Calciferous is not shown ; but 

 enough is shown to indicate that in this eastern region the Calciferous sand- 

 rock is a thick formation though, perhaps, not attaining as great a thickness 

 as at Sprakers and Little Falls. 



The Pattersonville Section. 



About one mile west of the Pattersonville station, on the West Shore 

 railroad, is a long cut made partly by the excavation for the canal and partly 

 by the West Shore railroad. A section was measured at this locality begin- 

 ning at the bottom of the canal. 



II B l . Bottom of canal. Compact thick bedded, steel-grey, 4/'"^ 

 arenaceous limestone weathering yellowish and containing abundance of flint 

 and calcite. The dip at the western end of the railroad cut is about 4°, 

 N. 55° W., and at the eastern end 4" in the opposite direction. Calciferous 

 sandrock, thirty feet in the canal cut and eighteen feet in the railroad cut. 



