43(5 



Report of the State Geologist. 



contain fossils* The Corniferous limestone sometimes has a dip of 20° to tln j 

 west. It extends northwestward up the Neversink valley, but is buried by 

 drift. A small outcrop occurs north of Port Orange, in the rear of C. Norris's 

 house, with a strike of X. 50° E. and a dip of 70 u W. Some of the layers at 

 this locality are quite shaly. The thickness of the Corniferous limestone at 

 Port Jervis is given by White* and Prosserf as 200 feet, and this seems a 

 very reasonable estimate. 



The Marcellus begins as a ledge of hard grey slate at the bend of the 

 Delaware river, with a cleavage dipping steeply to the southeast, and extends 

 up the Neversink valley, the lower members being buried under the drift, 

 the upper ones dipping under the Hamilton shales. At the north end of 

 Port Jervis, the Marcellus is exposed at the base of a steep hill, and here 

 consists of bluish black, fine-grained shales, which dip under the Hamilton 

 rocks that are exposed farther up the hill. The dark arenaceous Marcellus 

 shales also outcrop at the base of the ridge along the western side of the 

 Neversink valley. Those at the base of the hill along the railroad, at Rose 

 Point are, according to Prosser,^ probably near the boundary between the 

 Marcellus and the Hamilton. 



The total thickness of the Marcellus shales in the Neversink valley is 

 about 800 feet. The Hamilton rocks which overlie them have a thickness 

 of about 1,400 feet in Deer Park township. They consist of arenaceous 

 shales and shaly sandstones, passing upward through a calcareous zone 

 into argillaceous shales containing fossils. 



C. S. Prosser has noted a number of Hamilton localities within the 

 township and a list of the fossils found at each. They are, beginning at the 

 south, as follows : 



Arenaceous shales and sandstones of lower Hamilton a^e forming ledges 

 of a high hill just north of Port Jervis (1,477 Al of C. S. P.). 



One mile and one-half north of Port Jervis are coarse-grained ledges of 

 arenaceous shales and sandstones on the east side of the road (1,477 A2 of 

 C. S. P.). They contain Spirifer grcmulifer in great abundance. 



A short distance farther up the road, are coarse, fossiliferous, arenaceous 

 shales, forming ledges on the hillside above the road (1,477 A3 of C. S. P.). 

 This zone, w hich w as called Genesee by I. C. White, contains numerous fossils. 



On the east side of the road, a quarter of a mile south of Sparrowbush, 

 occurs another ledge consisting <>f coarse arenaceous shales, which carry 



* PciinHylvania Geological Survey Report, (i. fi. 



t Bulletin United StateH Geological Survey, No. VM. 



% IHd., p. 46. 



