Phosser and Cumings — Lowek Silurian Sections. 



•147 



The Calciferous sandrock outcrops frequently along the railroad between 

 the cut and Fort Hunter. On the side of the hill not far west of the Wemple 

 quarries, the Trenton crops out and was extensively 'quarried when the Erie 

 canal w as built.' 1 * The opening is an extensive one, the wall eight or nine 

 feet high, but it has not been worked in a long time and is not a favorable 

 place for collecting. 



The Amsterdam— Hoffman Region. 



The following sections on the north and south sides of the Mohawk 

 river, between Amsterdam and Hoffman, will give a clear idea of the litho- 

 logic characters and thickness of the Calciferous, Trenton and Utica forma- 

 tions in the eastern part of Montgomery county. The section on the 

 southern side of the river, to the south of Amsterdam, is especially important 

 in giving the great thickness of the Utica slate in this part of the Mohawk 

 valley. 



Section along Morphy Creek to the Top of Adebahr Hill. 



On the south side of the Mohawk, half way between Crane's Village and 

 Amsterdam (Port Jackson), on the estate of Mr. Benjamin Morphy, is an old 

 quarry in the bed of a creek, which empties into the canal, and which may be 

 called Morphy creek. One and three-tenths miles south of this quarry, a 

 north and south line through the latter point passes near the next creek east 

 of Morphy creek at some distance above its mouth. This line also passes 

 through Adebahr hill. A section was measured beginning at the canal level 

 below the Morphy quarry and extending nearly due south to the top of 

 Adebahr hill. (Section XLVI F.) 



F 1 . Canal level. Thick bedded layers of steel-grey, arenaceous JTm 

 limestone with thinner, mottled layers near the top which contain Ophileta 

 in abundance. 



F 2 . Medium dark, dove colored, very compact, fine-grained lime- 

 stone, with conchoidal fracture, containing occasional examples of Phytopsis 

 tithuh)s(i\ w eathers light bluish grey. Birdseye limestone. 



F*. Dark blue, fine grained limestone, somewhat lumpy, weathering In ^ hea 

 to an ash-grey. Contains corals. Base of Black river limestone. 



F 4 . Dark blue, fine grained limestone with occasional crystals of Inc £ C3 

 calcite; contains corals and Majmesquma alternata (Con.), II. and C. 



* This quarry is that mentioned by Vanuxem a* the Sage and Reed quarry, opposite Tribes Hill (Geology of New York, 

 Part III, p 37) 



