GLGY 301 Lecture Notes - Lecture 4: Park Ranges, Western Range, Passive Margin
20 Jun 2020
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Document Summary
Geology of the southern canadian rocky mountains part 2. There are cretaceous and jurassic rocks that are now in the front ranges of the rockies. The mountains moved over time from west to east. What used to be in front of the mountains became incorporated as the mountains moved. Long, straight ridges and cliffs of carbonate rocks: western range of rockies. Main ranges: linear features that represent the ridges sticking out. In eastern and western ranges, outcrop is patchy because the geology here has a different orientation. In main ranges geology is at, so it is stacked on top of each other. The rocks that make up main ranges are of a different range than the ones of front range. Front range: carboniferous, devonian, ordovician, early cambiran (450 - 65 mya) Main range: older rocks (700 - 400 mya) Gog rocks: cliff forming, main rock of passive margin. Softer rocks that form the valleys of the main ranges.
