142 NEW YORK STATE MUSEUM 



10^ northwardly, are the home of a great profusion of fossils many 

 of which are common to the upper or Grande Greve limestones of 

 Cape Gaspe. 



As to the essential concurrence of these faunas in a broad sense 

 there can be no question but the careful comparison of them leaves 

 room for doubt whether the actual horizon of the Perce rock is 

 represented in the series at Grande Greve. Inasmuch as the rock 

 succession of Cape Gaspe is constant as far as it extends there is 

 room for the provisional suggestion that the horizon of the Perce 

 rock with the precise expression of its fauna is there modified, but in- 

 dicates an early stage of the Grande Greve limestones. Perce rock 

 is not divisible faunally and its strata show no persistent differences. 

 They are indifferently yellow and red according to degree of oxida- 

 tion, and the process of color change, irrespective of sedimentation 

 lines or structural features, is everywhere finely marked. They are 

 highly veined with calcite seams, and the yellows seem, if anything, 

 to predominate on the south, the reds on the north. Mr Ells speaks 

 of their containing interleaved conglomerates but of such we have 

 seen nothing. We may not at this time give a statement of exact or 

 final determinations of its species, but the following suffices to in- 

 dicate the character of the fauna. To these we shall hope to return 

 in future with the detailed comparisons needful to ascertain the 

 organic and time relations of this fauna to those of the New York 

 series. Such species as are here indicated with unfamiliar names 

 will be fully defined and illustrated hereafter. 



Aulopora sp. 



Lingula rectilatera Hall. As in the Helderberg of New York 



L. spathata Hall. In the New York Helderberg 



L. elliptica nov. 



Orbiculoidea nov. cf. grandis Hall. New York Oriskany 



Pholidops terminalis Hall. Also in New York Oriskany 



Crania grandegrevensis nov. 



Leptaena rhomboidalis Wilckens. New York Oriskany 



Brachyprion majus Clarke. Oriskany 



Stropheodonta lincklaeni Hall. Oriskany 



Leptostrophia magnifica Hall. As in the Oriskany of New York 



