Results: 1 - 3 of 3
Apr 30, 2006
Earth Sciences Report
… of the DCGC in the Late Cretaceous has been identified with … offset formation tops from the Upper Cretaceous through the Paleozoic …
Dec 31, 1960
Bulletin
… basal sandstone member of the Upper Cretaceous Belly River formation. … eastward regression of the late Cretaceous Colorado sea. The …
Feb 28, 1946
Report
… to be underlain by non-marine Upper Cretaceous rocks in which coal …