56 F 9 . HEPORT OF PKOGRESS. E. W. CLAYPOLE. 



found in tlie Red shale in a few places abundantly, near 

 Buffalo Mills, for example, in the Buffalo valley, Saville 

 township. It is also found in the second division — the Va- 

 riegated shale — in Centre township, and becomes exceed- 

 ingly abundant in its upper portion, whole slabs being com- 

 pletely covered with its casts. The Gray beds afford few 

 opportunities for examination ; but it (L. alta) runs up 

 through the massive limestone which in this county makes 

 the lowest division of the Lower Helderberg rocks. Abovo 

 that level I have not found it. In regard to this species 

 in New York State, Yanuxem says, (1. c, p. 99:) 



"At one place only I succeeded in finding fossils in the 

 second deposit, (the Variegated shales,) consisting of Cy the- 

 rmae (Leperditiae) about half the size of those in the groups 

 above and below the salt group." In this respect, there- 

 fore, the correspondence is exact. 



No fossils having been found in the red shale in New 

 York the presence of Leperditia alta in those of Perry 

 county, though not without importance, does not bear on 

 the correlation. It has been mentioned that in the green 

 shale passage beds at the base of the red shale the Lower 

 Helderberg species Beyricliia notata has been found. This 

 may seem at first an objection against the classification here 

 adopted. But when we consider that the range of Leper- 

 ditia alta has been extended downward to the red shale, 

 there is no improbability in supposing that Beyricliia no- 

 tata which ranges equally high may descend a little lower. 

 It would not be wise to decide against an arrangement that 

 so well harmonizes with many facts on account of so small 

 an objection as this. Neither palaeontology nor strati- 

 graphy must decide such questions alone — they must work 

 hand in hand. Moreover, as the red shale in New York is 

 reported barren it is impossible to compare the two beds in 

 this respect. 



In the geology of the Fourth district Prof. Hall describes 

 eight species from the Onondaga shale, but does not say 

 from which division they were obtained. The locality of 

 seven of them, Newark, being near the south line of Wayne 

 county, it may be inferred that they do not belong to the 



