Professor Emerson on HaWs Geological Collections. 5bl 



iferous, and farther north and west by Jurassic strata, while the outcrops in and 

 around Frobislier Bay are in the immediate vicinity of and apparently skirting 

 the crystalline rocks, are dark colored, largely arj^illaceous inshore deposits, (con- 

 taining a very different assemblage of fossils (though of about the same age) 

 from the more western localities, viz : Galymene senaria, Con. ; Triarthriis Becldi, 

 Green 5 Endoceras jjroteiforme, H., tlattened as in the Utica slate Diplof/raptns 

 dentatus, Br.; CUmacograpMs quadrimucronatMs, H.; C. hicornis, H.; Lingnla 

 curta., H. 



The localities around Frobislier Bay bear, therefore, somewhat the same 

 relation to those of Prince William's Land and JJorth Devon which the typical 

 localities of the Utica slate and the Hudson Elver group in New York bear to the 

 more western areas of the Mississippi Basin. In Frobisher Bay we have a 

 group of fossils unmixed with those of earlier or later date, which mark the 

 exact horizon of the Utica slate, and the rocks have a lithological facies recall- 

 ing that of the typical localities of this epoch in New York. In the north- 

 western area the whole Paleozoic series seems to be represented by a nearly 

 unbroken succession of limestones, and the subdivisions merge into each 

 other as in the central basin of the United States. So that Houghton says 

 " the whole of North Somerset, Boothia Felix, King William's Land, and Prince 

 of Wales Land is thus proved to be of Silurian age, although the evidence as to 

 whether it is Upper or Lower Silurian is contradictory, as characteristic fossils of 

 both epochs are found throughout the whole area."* We must, however, associate 

 the locality at the extreme upper or western end of the bay already alluded to as 

 Silliman's Fossil Mount with the calcarious facies of the Arctic Silurian as described 

 by Houghton, since in the small list of seven species published by Stevens and 

 quoted above, five are probably identical with those described by Houghton, and 

 the two others are corals, described as new species ; so that this locality extends 

 the great Arctic limestone area greatly to the southeast, and makes it compar- 

 able in size with the central basin of the United States. 



CRYSTALLINE ROCKS. 

 23. Gkanite. 



A large and a small mass of very coarse red granite, containing deep flesh- 

 red orthoclase in large crystalline masses, a much smaller amount of gray quartz 

 and lepidomelane in black and greenish-black scaly corrugated plates. 



Locality, French Head, Field Bay. 



"Loc. cit., p. 53. 



