REPORT OF THE DIRECTOR I9T4 



1^1 



The " Oriskany " band (dark lined) in the Pic-d'Aurore formation 



This layer is a band of only 2 or 3 feet in thickness, and with 

 the white sandstones above and below, the total thickness of the 

 sand deposition is 100 feet or more. Under the sands in the heart 

 of the anticline comes a blue-gray limestone becoming brown and 

 dolomitic ; Leptaena rhomboidalis, a large Palaeoneilo 

 and a coarse meshed Dictyonema have been found, but the beds are 

 specially characterized by the abundance of Haliserites, a Fucus 

 highly characteristic of the early Devonic of western Europe but 

 essentially absent elsewhere from the Appalachian record. Below 

 this horizon are red-yellow platten-limestones with a large element 

 of sand, and these are visible in the section only on the western limb 

 of the syncline. In these beds has been found a very large Homa- 

 lonotus having a body width of 3 inches, and a large Diaphorostoma. 

 After some 40 feet of these beds follow below 75 feet more of much 

 distorted and corrugated green-gray thin sandstones which bend 

 upward to an almost vertical position. 



The succession of this entire series shows a marked diversity on 

 the two flanks of the folds, the true Oriskany fauna with its dark 

 sandstone band at the east not appearing at the west, and the lime- 

 stones beneath, constituting the part of the decapitated fold, are 

 identifiable on the uprise at the west only as interbedded with the 

 sandstones. This change is probably somewhat exaggerated in the 

 sketch here given, but it is evident that the close folding has squeezed 

 out these limestones in some measure, and, further, that the sand- 

 stones which make the lowest term at the west were not caught in 

 the edges of the fold and are thus not represented on the eastern 

 slope. 



