In southwestern Wyoming the lacustrine Green River formation of early and middle Eocene age intertongues laterally with fluviatile deposits of the Wasatch formation. For many years the Green River formation has been subdivided into the Tipton tongue (or Tipton shale member) at the base, the Laney shale member, and at the top the Morrow Creek member. (Bradley, 1926, p. 123) East of the eastern margin of the Bridger Basin the Cathedral Bluffs tongue of the Wasatch formation separates the Tipton tongue from the Laney shale member. (Sears and Bradley, 1924, pp. 99–100) A comparable tongue of...

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