In the last five years oil exploration within the Uinta Basin of northeastern Utah has directed considerable attention to the complex lithologic character of the Green River (Eocene) formation. Changes within a very short distance both vertically and laterally make correlation difficult. Geologists have contributed somewhat to the natural difficulties by widespread and inaccurate use of the term “marlstone,” in their descriptions of Green River rocks. Objections to the present extensive use of “marlstone” are three-fold.

1. Geologists, in some cases, have applied the name to many hundreds of feet of sediment without really trying to determine a more specific...

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