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Principles of North American Pre-Cambrian Geology
Principles of North American Pre-Cambrian Geology Author:Charles Richard Van Hise General Books publication date: 2009 Original publication date: 1896 Original Publisher: Gov't. print. off. Subjects: Geology, Stratigraphic Science / Earth Sciences / General Science / Earth Sciences / Geology Science / Paleontology Notes: This is a black and white OCR reprint of the original. It has no illustrations and there may ... more »be typos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. Excerpt: ? II. HISTORICAL GEOLOGY. In the following resume of the present state of knowledge of the various regions of North America the order is not consistently geographical or geological, but rather that of the development of exact knowledge of the pre-Cambrian rocks. The great Canadian pre-Carn- brian area is a geological unit, yet detailed study has been confined to particular localities, and of necessity the districts which have been units of work have been followed in this paper. The Original Laurentian area is treated first. Following this the Adirondack district, the Hastings district, the Original Huroniau district, and the Lake Superior region are taken up in order. These are considered next because exact knowledge of the pre-Cambrian rocks therein is greater than of those rocks in other areas. Following the Lake Superior region the Great Northern region, Eastern Canada, and Newfoundland are considered; then the isolated areas of the Mississippi Valley, the Cordilleras, and, finally, the Eastern United States. The latter region, although the earliest to be studied, is taken up last, for it is an area in which the conditions for obtaining exact knowledge are the least favorable and in which comparatively little structural knowledge of the pre-Cambrian has been acqnired. The summaries of the present state of knowledge concerning the individual districts are not accompanied by references to literature. To give such references would very...« less