prosser.] SEPARATION OF CHEMUNG AND CATSKILL. 13 
Catskill in G6." ' In the letter mentioned above Prof. White writes that 
600 feet of sandstones, which in G6 were put in the Catskill, should he 
added to the Chemung. Preferring to the difficulty in separating the 
Chemung and Catskill, the professor says: " I think the only possible 
separation of Chemung and Catskill is that founded upon physical 
characteristics, and in my opinion we should separate them at the hori- 
zon of the lowest red beds, for these seem to come in at about the 
same general zone everywhere, and it is the only possible means of 
separation." These sandstones are well exposed at Spragueville and 
in the Delaware, Lackawanna and Western Railroad cut just north of 
the station. In this cut is a layer of red shale, in the midst of the 
sandstone, which is the first or lowest red bed seen in the section. 
The second railroad cut, just north of the Brodhead Creek railroad 
bridge, is in the New Milford red shale, which is now regarded by Prof. 
White as forming the base of the Catskill. 2 The red shales alternate 
with gray shales and sandstones as far as the u High Bridge" over the 
west branch of Brodhead Creek, when the Delaware River flags of 
White are reached. 3 These flags do not consist entirely of gray shales 
and sandstones, but reds alternate with the grays. 
No. 1475 E2. — At the southern end of the first railroad cut north of 
the "High Bridge," a slab of greenish-gray sandstone was found which 
contained many impressions of Orthonota (?) parvula Hall, 4 a species 
which occurs in the upper Hamilton shales of Schoharie County, N.Y., 
as well as frequently in the argillaceous Hamilton shales of central and 
western New York. There is also a calcareous (?) breccia which con- 
tains fragments of Brachiopod shells, as Spirtfera sp., and fish bones. 
The dip in the cut is more than 20° north. The rocks of the railroad 
cut are red, gray, and greenish shales, alternating with sandstones. 
At the northern end of the cut, near the sign " whistle," are coarse, 
grayish, arenaceous shales in which fern stipes occur, and one poorly 
preserved frond of Archwopteris minor Lx. (?) was found. 
No. 1475 El. — A short distance south of the Henry ville Station is a 
railroad cut through the red shale which is called the Montrose red 
shale by Prof. White. 5 The dip is about 14°, between 20° and 25° west 
of north. In the red shale of this cut Prof. White reported "vast 
numbers of fronds of Archwopteris Jacksoni." 6 
In another place the rarity of fossils in the Catskill is commented 
upon and the importance of this locality noted as follows: "Plant 
'G 7 , p. 73. 
^G 6 , pp. 101, 273. 
? G 6 , p. 100. 
"The first published reference to this discovery is in the Araer. Geol., Vol. ix, p. 15, footnote. Dr. 
Charles E. Beecher has seen these specimens and agrees with the above identification. Dr. J. M. 
Clarke has kindly compared some of the specimens with the types in the New York State Museum 
at Albany, and writes : " I see no reason why the shells in question should not be regarded as Ortho- 
nota ( ?) parvula, in accordance with your identification; I have compared them with the types of 0.(?) 
parvula and can find no distinctive characters." 
6 G 6 , pp. 320, 98. 
e Ibid., p. 320. 
