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Sep 26, 2017
Open File Report
… from Lower Jurassic to Lower Cretaceous strata of the southern … of the Jurassic through Lower Cretaceous strata of the Rocky … of the Jurassic through Lower Cretaceous Strata of the Rocky …
Dec 31, 1960
Bulletin
… basal sandstone member of the Upper Cretaceous Belly River formation. … eastward regression of the late Cretaceous Colorado sea. The …