48 NEW YORK STATE MUSEUM 



15 feet in thickness. The beds are nearly barren; only a few frag- 

 ments of eurypterids were found in the lowest portion. More fos- 

 siliferous proved the excellent exposures along the Vly beginning 

 at the fall a mile below Voorheesville. These beds are from 500- 

 600 feet or more from the base of the Upper Siluric beds (Manlius 

 waterlime) of the Helderbergs. The beds of that section are at 

 the western edge of the Appalachian folds of the slate belt of New 

 York and still slightly disturbed by small folds and some overthrusts 

 of probably small throw. The upper beds of this section, which 

 comprises about 200 feet, consist of fossiliferous black to grayish 

 argillaceous shales with several sandstone intercalations and the 

 lower beds of black shales with but few and thin sandstone beds. 

 These shales, of which 80 feet are exposed in the steep eastern bluff 

 of the creek, were formerly referred by the writer (title 47, page 

 532) on account of their lithic character and fossil contents to the 

 Utica shale. We have now a much larger fauna from this section 

 at our disposal which, with our present knowledge of the shale 

 faunas, throws a different light upon the question of the age of 

 these shales. The latter contain : 



Diplograptus vespertinus Rued. (c) 



Diplograptus (Mesogr.) putillus Hall (cc) 



Climacograptus typicalis Hall (c) 



Leptobolus insignis Hall (r) 

 Minute individuals of Rafinesquina 



Pterinea (Prolobella) trentonensis Conrad (r) 



Orthoceras sp. nov. (" Endoceras proteiforme ") (c) 



Lepidocoleus jamesi H. & W. (r) 

 Primitia sp. 



The sandstone layers of the upper portion have furnished : 



Climacograptus typicalis Hall 

 Hughmilleria cf. magna C. & R. 



An excellent section leads from these beds up to the Upper Siluric 

 along a branch of Black creek at the Indian Ladder. The beds here 

 exposed have furnished a different fauna and are described further 

 on (p. 50) as Indian Ladder beds. 



The combined faunal Hst of the Schenectady formation is : 



Sphenophycus latifolius (Hall) 

 Dictyonema multiramosum nov. 

 Azygograptus sp. nov. 

 Mastigograptus nov. cf. simplex Walcott 

 M. sp. nov. 



