Abstract
A diverse suite of nonmarine trace fossils is present in a late Eocene sandstone-siltstone-mustone sequence in the Duchesne River Formation of northeastern Utah. On the basis of primary sedimentary structures and stratification sequences, the beds are interpreted as deposits in meandering and braided stream environments. The trace fossils include Ancorichnus, “Muensteria”m, ?Palaeophycus, Scoyenia, Skolithos, two unidentified ichnotaxa, and rhizoliths. Insects and oligochaetes apparently made most of the animal traces in moistor wet, cohesive stream sediment during subaerial exposure or under thin water cover.
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