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Geological Regions (153 words) |
 | Five of them are of Phanerozoic age (less than 570 million years old) and are arranged roughly concentrically around and partly on the sixth, the Canadian SHIELD (of Precambrian age, more than 570 million years old). |
| The Phanerozoic regions, which overlap in age, are the Innuitian Orogen, the Appalachian Orogen, the Interior Platform, the Canadian Cordillera and the continental shelves. |
| Each region has a distinctive architecture and is composed of building blocks of characteristic types and sequences of rocks (tectonic assemblages) that record its development (see also PLATE TECTONICS). |
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