56 NEW YORK STATE MUSEUM 



Feetr 



A U Onondaga limestone; well shown in the upper 98=1175 

 part of the terrace to the north of the New Salem 

 road. The upper part of the formation forms 

 the floor of this road for nearly two miles on the 

 plateau. 



A 12 Marcellus shale; black argillaceous shales ex- 170=1345 

 posed along the road up the hill to the south of 

 the New Salem road and in the gullies on the 

 northwestern side of the hill. 



A 13 Covered. - 20=1365 



A 14 Hamilton; arenaceous shales to thin sandstones 

 at the base; but mainly shales to the top of Signal 

 Station hill. Some specimens of the small Ham- 

 ilton lamellibranchs, as Palaeoneilo con- 

 stricta (Con.) Hall; Nucula bellistriata 

 (Con.) Hall; Nuculites triqueter Con.; 

 N. oblongatus Con. and others, are found 

 in the shales in the upper part of this hill. 



ALTAMONT SECTION 



XI C 1 To the south of Altamont is a conspicuous point 646=64& 

 of the Helderbergs known as High point, where 

 the general trend of the escarpment turns from 

 a northwesterly to a westerly direction. The 

 lower 646 feet of the point, according to the 

 measurement of Ashburner, 1 from the Dela- 

 ware and Hudson railroad station to the base of 

 the Lower Helderberg limestones belongs in the 

 upper part of the Hudson river formation. This 

 thickness, added to the 2880 feet of shales and 

 thin sandstones passed through in the Altamont 

 ,well before reaching the top of the Trenton lime- 



lThe railroad station (formerly Knowersville) is 459 feet A. T., and" 

 Ashburner gave the altitude of the gas well's mouth as 510 feet A. T., and 

 the base of the Lower Helderberg limestones as 595 feet vertically above- 

 the mouth of the well. — Trans. Amer. inst. min. eng. 16:951 



