| http://www.w3.org/ns/prov#value | - Several key findings include (1) the Rocky Mountains may have looked very similar to the present mountains between 150-140 Ma; (2) the mountain belt was affected by a long period of erosion (nearly 25 m.y., between 140 and 115 Ma) that dramatically reduced topography; and (3) the mountain belt was mantled by sediment, including volcanic ash, from the Coast Mountains and was exhumed to its present
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