44 NEW YORK STATE MUSEUM 



ever found, is always followed by the Onondaga limestone and 

 west of Syracuse rests upon the Upper Siluric strata. The varia- 

 tions of the silicious and calcareous sediments and of the varying 

 thicknesses along different meridional sections, as also the con- 

 ditions of sedimentation and distribution of the fauna of the 

 Oriskany of New York, have been stated in detail by Clarke. 1 

 The Oriskany formation in the area studied outcrops at the 

 "highway which crosses the north end of Pea hill and extends 

 into the fields below. It has a thickness of at least 50 feet and 

 it may be much thicker. The beds are light gray in color and 

 very massive and in some of the layers pebbles are abundant. 

 The rock is very hard and fossils are few and not readily obtained. 

 The following have been recorded by Darton from this locality: 



Anoplia nucleata Hall Leptaena rhomboidalis Wilckens 



Leptocoelia nabellites Conrad Stropheodonta, sp f 



Port Ewen and Becraft limestones. These formations, which 

 normally come in between the Oriskany and the New Scotland 

 "beds, are not definitely known in this section. There is a covered 

 space between the Xew Scotland and the Oriskany, but the 

 ground is mostly low and swampy and not favorable for deter- 

 mining the nature of the intervening formations. There are. 

 however, a few outcrops which doubtfully may be referred to 

 the Becraft. The structural relations in this area, between the 

 Oriskany and the Xew Scotland beds, suggest that faulting may 

 have taken place. 



New Scotland limestone. This formation is exposed in both 

 limbs of the syncline. In the west one there are small expos- 

 ures in the woods south of the railroad cut. In the east limb it 

 is exposed at several places and specially where pits have been 

 dug for limonite. to which reference will be made later. This 

 formation is the highest that can be observed for 34 mile south 

 of the railroad, the interval between it, as exposed in the two 

 limbs of the syncline, being occupied by a swamp. The entire 

 thickness of the formation could not be measured, but its 

 exposed thickness is not less than 40 feet. These beds are very 

 fossiliferous and shaly. and from y 2 cubic meter of shale Darton 2 

 collected more than 40 species. 



Coeymans limestone. This formation is but obscurely shown 

 in the west limb of the fold. There is a small exposure in a 

 ■depression just south of the railroad. Other unimportant expos- 

 ures are seen in the woods bevond. The formation is best shown 



»N. V. State Mus. Memoir 3. 1900. p. 65, 

 2 Am. Jour. Sei. 1886. 51: 214. 



