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East Dalton Wells tracksite (Morrison Formation) (Jurassic of the United States)

Also known as Arches National Park survey L-GFE-94-64

Where: Grand County, Utah (38.7° N, 109.7° W: paleocoordinates 34.5° N, 55.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Brushy Basin Member (Morrison Formation), Late/Upper Jurassic (161.2 - 145.5 Ma)

• "The tracks occur at or near the top of the lower Brushy Basin Member in the uppermost of the most prominent sandstone layers within this unit."

• bed-level stratigraphic resolution

Environment/lithology: "channel"; bioturbated sandstone and mudstone

• "These beds probably represent recurring sequences of channel and overbank deposits."
• "The lower Brushy Basin characterized by red, non-smectitic mudstones and siltstones [approx. 2 m thick] with laterally discontinuous [ledge-forming] sandstones that are seldom greater than, and usually less than one meter in thickness."

Size class: macrofossils

Preservation: cast, trace

Collected by G. Engelmann

Primary reference: G. F. Engelmann and S. T. Hasiotis. 1999. Deep dinosaur tracks in the Morrison Formation; sole marks that are really sole marks . Utah Geological Survey Miscellaneous Publication 99-1:179-183 [J. Alroy/R. Whatley/M. Uhen] more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 13275: authorized by John Alroy, entered by Robin Whatley on 12.02.2002, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)