444 NEW YORK STATE MUSEUM 



west of Hoffman ferry station) the Calciferous forms the surface 

 rock and the superincumbent beds have been entirely eroded away. 

 At Van Epp's hill however both the Trenton and the lower part 

 of the Utica are present. A section from the level of the Mohawk 

 river at Hoffman ferry to the top of Van Epp's hill is as follows, in 

 ascending order. 



2A Section of Van Epp's hill 



A^ Massive, thick bedded, steel-gray, arenaceous, 

 buff-weathering limestone. The lower 20 feet 

 covered beneath the railroad and 48 feet im- 

 mediately succeeding, exposed in the N. Y. C. & 

 H. R. railroad cut. Above cut mostly covered. 

 Rock contains calcite and chert. Calciferous sand- 

 rock. 290'=290' 



A2 Base consisting of dark blue, moderately fine 

 grained, arenaceous limestone containing fucoid- 

 like markings which on weathered surface are yel- 

 lowish in conspicuous contrast with the grayish- 

 weathering matrix. Fucoidal member of the Cal- 

 ciferous sandrock. 6o'=35o' 



A^ In open field east of highway at an elevation 

 of 350 feet above river level, small exposure at 

 spring, at top 3' 11" gray crystalline limestone 

 (Trenton) underlaid by 2' 6" ash-white-weathering 

 limestone (Black river), then Y' g^^Y crystalline 

 limestone, finally 2J' compact light- weathering 

 limestone. Across the highway from this point are 

 5 feet in one layer of compact limestone con- 

 taining Columnaria alveolata. Black 

 river. 5'=355' 



A* In the field west of the highway opposite a 

 house are 5 feet of thick bedded blue crystalline 

 limestone containing Rafinesquina alter- 

 n a t a (Con.) Hall and Clarke, in abundance. 

 Trenton. 5'=z=36o' 



A^ In top of fault escarpment a short distance 

 northeast of no. 4 are 25 feet of thin, fine grained 

 layers of dark blue limestone containing T r i n u - 

 cleus concentricus Eaton. Trenton. 25'=385' 



