First Pan Pacific Scientific Conference Under The Auspices Of The Pan Pacific Union Honolulu Hawaii August 2 To 20 1920 PDF Download

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: GEOLOGICAL MAPPING IN THE CANADIAN CORDILLERA By Victor Dolmage, Geologist, Canadian Geological Survey The great bulk of geological work in British Columbia and Yukon Territory has been performed by the Geological Survey of Canada. Geological work was begun in the Canadian Cordillera in 1859 when Hilary Bauerman began a traverse along the forty-ninth parallel. No maps, however, accompany his report, which appeared in 1884. Actual geological mapping was begun in 1871 by James Richardson, who studied the coalfields of Vancouver Island. From 1871 to the present over 90,000 square miles have been geologically mapped, and about 4000 miles of water routes traversed. About 42,800 square miles of this was done by early explorers on a scale of eight miles to the inch, and though some of it may be classed as good reconnaissance survey, much of it is only exploratory work. About 3100 square miles of good reconnaissance was done on a scale of six miles to the inch by more recent workers. About 32,600 square miles were done on a scale of four miles to the inch, all of which work is good reconnaissance survey; and some of it may even be classed as detailed work. About 10,200 square miles were done on a scale of two miles to the inch, all but a small portion of which is detailed work. About 5800 square miles were mapped on a scale of one mile to the inch, all of which is detailed work, and much of it very detailed. About 163 square miles of refined work was done on scales ranging from 400 to 2640 feet to the inch. From the standpoint of the character of the work produced, mapping in this region naturally divides itself into two periods. The division, which is by no means a sharp one, comes shortly after the beginning of the present century. Prior to that time most of the work was of...