138 TRANSACTIONS OF THE [JUNE 6, 
On the ‘‘ Geological Map of New Jersey,” by George H. Cook, 
published in 1889, the geological discoveries stated above seem to 
have been ignored ; for Bearfort, Green Pond, and Copperas moun- 
tains are apparently colored as belonging to the base of the Lower 
Silurian, which would make their age about the same as stated by 
Professor Cook in 1868, while that part of the area colored as Hud- 
son River Slates on the earlier maps remains unchanged. 
Professor Lester F. Ward, in his memoir on ‘‘ The Geographical 
Distribution of Fossil Plants,’’ quotes as follows from a letter 
written by Prof. I. C. Russell, November 2, 1887: ‘‘Mr. N. H. 
Darton is authority for the occurrence of Devonian plants near 
Monroe and Woodbury Falls, Orange County.’” In Prof. Russell’s 
letter, which Professor Ward has kindly shown me, it was also 
stated that Mr. Darton had found Devonian plants near Newfound- 
land, Morris County, New Jersey. Mr. Darton informs me that 
this locality was near Clinton Falls, but that the plants were in a 
very fragmentary condition and not nearly so well preserved as 
those near Monroe, New York. 
In Macfarlane’s Railway Guide, Mr. Darton has briefly described 
the Skunnemunk Mountain region as follows :— 
‘“ Monroe.—A mile west of the station a synclinal holding middle 
Devonian is crossed, but no outcrops are visible from the cars. 
These rocks extend for many miles southward into New Jersey. 
In New York they form Bellvale Mountain to the Erie Railroad, 
and thence extend northward in the high, rough, double-crested 
ridge known as Schunemunk Mountain. The lower members are 
flagstones and slates, the upper a coarse pebble conglomerate. In 
a flagstone quarry, two miles N.N.W. of Monroe, the remains of 
Devonian plants are quite abundant.’” 
In July, 1890, the writer stopped at Monroe, spent three days in 
searching for fossils on Skunnemunk Mountain and obtained certain 
facts which perhaps deserve to be recorded. 
About one and one-half miles northwest of Monroe, near the base 
of Skunnemunk Mountain, is a small quarry on Mr. Ogden Cooley’s 
farm. The New York; Lake Erie and Western Railroad at Mon- 
roe is 613’ A. T.,8 and this quarry is 45’ higher. There is a ledge 
of coarse-grained, gray sandstone with blue argillaceous shale, and 
in places the shale is somewhat concretionary, containing clay 
pebbles. The dip is heavy to the east, a line along one of the 
joints, which may not be the true dip, gives a dip of 35° north of 
east. 
In the shales are remains of fossil plants, most of which are quite 
fragmentary. The common form is Psilophyton princeps Dn., of 
which there are numerous broken specimens, and in addition, ir- 
1 Eighth Ann. Rept. U.S. Geol. Surv., 1889, p. 859. 
2 Amer. Geol. Railway Guide, 2d ed., 1890, p. 132, note 129. 
3 Elevation furnished by Mr. Carl W. Buchholz, Civil Engineer of the N. 
Wey ilinHperV i. hts. he 
4 Elevations from the railroad up the mountain are barometric. 
