4227) E. S. MOORE 
On visiting the Belcher Islands the writer was impressed by 
the extraordinary development of structures which seemed to 
resemble so strongly the cryptozoons of the Upper Cambrian that 
they were at first regarded as species of that fossil. However, there 
seemed to be some marked differences between the two types, and 
the Belcher Islands specimens should be regarded as deposits made 
by a new group of algae. These fossils have an important bearing 
on the age of the associated rocks, because if they be regarded 
as cryptozoons we must either change the generally accepted 
Fic. 8.—‘‘Ribboned”’ ferruginous shale more highly silicified in alternate layers, 
Tookcarak Island. 
conclusion that these rocks are pre-Cambrian or we must push 
the cryptozoons back into the pre-Cambrian. There is no definite 
evidence that the sediments on the east coast of Hudson Bay are 
pre-Cambrian, but there is as much evidence as there is for the age 
determination of most of our pre-Cambrian rocks of Northern 
Canada. Leith™ points out the remarkable resemblance between 
them and the Animikie of the Lake Superior region, and Low,’ 
after considering them as Cambrian and then as Laurentian, finally 
concluded that they were more like the later pre-Cambrian. 
LC. Ke Leith ops cite 1p 233. 
2A. P. Low, op. cit. 
