Abstract

The recent discovery of numerous and widespread fossil catfish (Astephus antiquus) in oil shale units of the Laney Member of the Eocene Green River Formation is evidence of aerobic conditions in the hypolimnic waters of ancient Lake Gosiute. An understanding of bottom conditions in Lake Gosiute is of particular importance in interpreting the depositional environment of the Green River Formation and particularly of oil shale. The fossil catfish indicate that oil shale deposition does not require a permanently stratified lake with a stagnant hypolimnion.

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