Several cyclic patterns occur in deposits of fluvial, shallow lacustrine, and deep lacustrine environments in the Parachute Creek Member of the Green River Formation (Eocene), northeastern Uinta Basin, Utah. Individual cycles may be traced laterally, and ideal patterns correlated. Changes in the level of Lake Uinta, possibly resulting from climatic fluctuations, are postulated as the direct cause of the cycles. The presence of such correlative cycles in different facies imposes restrictions upon possible modes of origin, and aids in the reconstruction and interpretation of Lake Uinta.

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