370 PALEOZOIC ROCKS OF THE HUDSON BAY REGION 



east, or Atlantic, realm, across New York, than that it entered the conti- 

 nent from the Arctic region by way of Hudson Bay. 



The Magaran fauna of the Hudson Bay region certainly reached as 

 far south as southern Ontario, but appears not to have advanced far into 

 the United States. The Niagaran fauna of Wisconsin, like the earlier 

 Silurian in this region, may be of northern origin, as it resembles that of 

 the Niagaran of the Hudson Bay region more closely than does that of 

 the Niagaran of Illinois, Iowa, and New York, as is shown by the oc- 

 currence of such unusual coral species as Cystostylus infundibulus, 0. 

 typicus, and Pycnostylus guelpliensis in the Niagaran of both the Wis- 

 consin and Hudson Bay regions. The province or basin in which the 

 Niagaran rocks of Illinois and New York were deposited must have been 

 completely separated either geographically or in time from that of the 

 more northern basin, which contained the Magaran faunas of the Hudson 

 Bay and Ontario regions, so that little or no opportunity was permitted 

 for the intermigration of any of the many species that inhabited these 

 different basins. The paleogeographic map, figure 3, will show the views 

 of the writers regarding the relations of the geologic provinces of North 

 America during this part of the Niagaran epoch. 



Devonian Rocks in the Hudson and James Bay Eegion 



earlier studies 



For our previous knowledge of the Devonian rocks in this region we 

 are indebted largely to the work of Eobert Bell and W. A. Parks. In a 

 report on the east coast of Hudson Bay, BelP° lists, on the authority of 

 Whiteaves, several species of Devonian fossils that were collected between 

 the long portage of the Missinaibi branch of Moose River and Moose Fac- 

 tory. These species are thought to indicate the Upper Devonian age of 

 the strata and are similar to those occurring in the Devonian rocks along 

 Abitibi River. In a report of an exploration of portions of Attawapiskat 

 and Albany rivers, BelP^ gives a list of Devonian fossils collected along 

 Albany River for some distance above Fort Albany. These were identified 

 by Whiteaves, who considered them of Lower Devonian age. In a later 

 report BelP^ lists the species of fossils from the Devonian rocks along 

 Kwataboahegan River and also gives a list of species collected along the 

 Abitibi. 



20 Robert Bell : Report on an exploration of the east coast of Hudson Bay in 1877. 

 Geol. Survey of Canada, 1879, Rept. C, pp. 5c to 6c. 



21 Robert Bell : Geol. Survey of Canada, Summary Rept., 1886, p. 33G. 



22 Robert Bell : Geol. Survey of Canada, Summary Rept, 1902 and 1903, pp. 230A and 

 236A. 



