THE DEVONIAN SYSTEM OF EASTERN PENNSYLVANIA 
AND NEW YORK. 
By Charles S. Prosser. 
INTRODUCTION. 
By way of introduction a section will be described across the Devo- 
nian of the northeastern part of Monroe County, Pa., along the line of 
Brodhead Creek and the Delaware, Lackawanna and Western Rail- 
road. The base of this section will rest on the Corniferous limestone 
well exposed in a railroad cut a mile south of East Stroudsburg and 
the termination will be in the Pocono, as exposed on the Pocono Moun- 
tains, from Mount Pocono to the ridge northwest of Tobyhanna. 
STROUDSBURG, MONROE COUNTY, PA.— 1475. ! 
One mile south of East Stroudsburg the Delaware, Lackawanna and 
Western Railroad makes a cut through an anticlinal axis of the Cornif- 
erous limestone, near the center of which is the Cauda-galli grit. 2 On 
the western side of Brodhead Creek, along the line of the New York, 
Susquehanna and Western Railroad, are exposures of the Corniferous 
limestone which in some respects show the folding better than those 
on the eastern side of the creek. A very small anticlinal fold occurs 
just south of the railroad bridge across McMichaePs Creek, most of the 
rock being eroded so that only an occasional stratum shows. Then the 
rocks are for a short distance covered, when the limestone again 
appears with a dip of 30° from 10° to 15° east of south. Under this 
limestone, at the north end of the bluff, are very black Marcellus shales 
which have been excavated in the hope of finding coal. This structure 
shows it to be an overturned dip of the Corniferous. South of the lime- 
stone the rocks are covered for about 100 feet, when an anticlinal arch 
of limestone is exposed along the railroad for 105 feet. If the small 
ridge of limestone just south of McMichaePs Creek be followed a short 
distance southwest, an exposure of shaly limestone will be found in 
which fossils are abundant. (1475 B 4.) 3 
1 Station number shown on map (PI. r) accompanying this bulletin. 
'-This cut is well described by Prof. White in 2d Geol. Survey Penn., G fi , pp. 119, 265, 2G6, where 
it is stated that the Corniferous limestone lias a thickness of about 200 feet, and that 50 feet of the 
Cauda-galli grit is exposed at the center of the arch. 
3 This is probably the locality mentioned by Prof. White as one of the best iiuMonroe County for 
collecting Corniferous fossils (G 6 , p. 120). On pp. 120, 121 ho gives a list of eleven species from this 
and other localities in Monroe County. Also see paragraph on p. 26G in reference to the East 
Stroudsburg axis of Corniferous just south of Stroudsburg. 
3 
