484 



Report of the State Geologist. 



stoma depresmm, Lingula, sp., E<tt<mi<( peculiaris, Meristella, sp., Discina, 

 sp., Tentaculites, sp. Thickness here fifty to seventy-five feet. 



From this point the Oriskany extends northward along the base and 

 w estern slopes of the Helderberg ridges. It consists of shales and inquire 

 shaly limestones, which at times are very arenaceous. The usual strike is 

 N. 30 p E., and there is a pronounced cleavage. 



From locality 40, the Oriskany extends southwestward to Fort Jervis, 

 forming the western face of the Helderberg -ridge. The formation preserves 

 the same characters that it exhibits east of Cuddebaekville, but there is an 

 apparent increase in thickness, and east of Carpenter's Point the Oriskany 

 must be 100 to 125 feet thick. 



The Esopus slat, ( — ( 'auda-galli grit) is first seen east of Huguenot, along 

 the Neversink river. It increases rapidly to the southeastward, being no less 



Figure 12. Section across the Neversink valley at Cuddebaekville. 



H. R., Hudson river shales; M., Medina; P., Helderberg limestone; O., Oriskany; D., Drift; 



H., Hamilton ; C, Chemung. 



than 700 feet thick east of Fort Jervis. The formation consists of black, fine- 

 grained slates, passing upward into grey grits. The members have a marked 

 easterly dipping cleavage, and the true bedding is rarely visible. The black 

 slatj members are finely exposed in the railroad cut of the Erie railroad, one 

 and one-half miles northeast of Fort Jervis, while the grits appear along the 

 Neversink river, especially southeast of Huguenot. 



The Esopus formation gives rise to narrow, rough ridges, which at times 

 suggest the presence of possible step-faults, but this fact is not certain. To 

 the north, the Esopus slate passes under the alluvium of Neversink valley, 

 north of Huguenot. 



The Helderberg formations reach their greatest development in the 

 region just north and south of the boundary line between New York and 



