NORTHERN END OF THE HELDERBERG PLATEAU 65 



Feet 



B 6 Shaly limestone, forming the middle covered 128=495£ 

 slope of the hill. 



B 6 Massive light gray limestone, well-exposed in 21=516J 

 the cliff just below the house of George Acker. 

 Becraft limestone which has a thickness of 15J 

 feet on the vertical face of the cliff, above which 

 is apparently 5J feet of massive limestone that 

 ought to be referred to this formation. 



B 7 Upper shaly limestone, which is mostly covered; 9£=525£ 

 apparently 9| feet thick and possibly thicker. 



B 8 Oriskany sandstone, which is best exposed in 6|(?)=532 

 the yard by the house of George Acker. The 

 upper part is a massive, dark gray to blackish, 

 quartzose, very fossiliferous sandstone, showing 

 usually a stratum from 1 to 2 feet thick. In the 

 Acker yard, however, there are thinner sand- 

 stone layers below this stratum, which ap- 

 parently belong in the Oriskany though on 

 account of the unfavorable exposure, it was not 

 possible to determine whether they contained 

 fossils or not. These lower sandstones increase 

 the thickness to 6J feet. > 



B 9 Esopus shale, mostly covered, forming the 121-653 

 upper covered slope of the hill. 



B 10 Onondaga limestone, which forms the upper 56=709 

 limestone cliff and top of the hill. 11 feet of 

 the limestone is shown in the ledge; but below 

 this the rock is covered, so that the Schoharie 

 grit is not shown in this section. 

 In the above section the thickness of the Helderberg limestones 

 is 256 feet, which is not much greater than that assigned to them 

 by Darton, who reported that " at Schoharie [it is] not over 240 

 feet"; 1 but the Esopus shale is some 50 feet thicker than stated 

 by Darton. 2 



H3 th an. rep't N. Y. state geologist. 1893. p. 204. 



213th an. rep't N. Y. state geologist. 1893. p. 203, where it is given as 



70 feet at Schoharie." 



