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 AVard has kindly shown me, it was also 

 stated that Mr. Darton had found Devonian plants near Newfound- 

 land, Morris County, New Jersev. 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.,' 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 Pailophyton princeps Dn., of 

 which there are numerous broken specimens, and in addition, ir- 



> Eighth Ann. Kept. U. S. Geol. Surv., 1889, p. 859. 



2 Amer. Geol. Railway Guide, 2d ed., 1890, p. 182, note 129. 



3 Elevation fnrnished by Mr. Carl W. Buchholz, Civil Engineer of the N. 

 Y., L. E. & W. R. R. 



* Elevations from the railroad up the mountain are barometric. 



