CAMBRIAN' 
nOWLlxG 
The section there recorded, is in a general way, made up of quartz 
conglomerates, (juartzites and sandstones. Associated with and over- 
lying them is a seiies of cherts and shales, mostly dark colored. Over- 
lying the.se hods is a heavy traj) overilow and the total thickness of 
the series is placed at about 2,800 feet. This great thickne.ss is not 
found 1 on the west side of the bay, liowever, but the upper part is 
probably there represented. The low<'r part is no doubt concealed 
by the Silurian limestones which are deposited along the margin^ 
flanking it, not only along the Hudson bay side, but also to the .south in 
the valley of the Rkwan river. The thickness of the marine clays and 
till which surround this rocky ridge, also conceals the underlying rock, 
