Abstract
The following article presents the most evident physical characteristics of the older Cretaceous sediments which have been encountered by wells drilled in northeastern Colorado. On the basis of these characteristics, observed largely with the aid of a microscope, it has been possible to correlate the sediments with a considerable degree of accuracy throughout the area. The members of the Benton formation which are commonly evident in outcrops, could not be recognized in the well samples with any degree of certainty, but the changes in character of the sediments in this formation did permit its subdivision into a calcareous and a non-calcareous member. The members of the other formations all showed quite distinct differences in physical character.
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