CHAPTER VIII.

GEOLOGY. Sources of Information—Succession of the Rocks—Earth Movements—Archæan Backbone—Silurian Sea—Devonian and Carboniferous Uplift—Mesozoic and Miocene Tertiary—The Glacial Period—Details of Geology—Archæan—Hudson Bay, Baffin Island, Islands of Group III., Ellesmere and North Devon Islands 183