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- 
rocks) / : 
A? 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. 
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 7” gray crystalline 
limestone, finally 23’ compact light-weathering 
limestone. Across the highway from this point are 
5 feet in one layer of compact limestone con- 
tainng: Columnaria ‘aly eolapas Black 
river. 
A‘ In the field west of the highway opposite a 
house are 5 feet of thick bedded blue crystalline 
limestone containing Rafinesquina alter- 
nata (Con.) Hall and Clarke, in abundance. 
Trenton. | 
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 Trinu- 
cleus concentricu's Eaton: Tremor 
290’—=290’ 
Go’==350” 
5/=355’ 
5 geo" 
25/385’ 
