Presentation Title

Using tracks to correlate the Nugget Sandstone Formation of Dinosaur National Monument, Utah

Advisor Information

George Engelmann

Location

Milo Bail Student Center Ballroom

Presentation Type

Poster

Start Date

8-3-2013 1:00 PM

End Date

8-3-2013 4:00 PM

Abstract

The Nugget Sandstone Formation, in northeastern Utah has been considered to be Early Jurassic in age. Large-scale cross-bedded eolian dune sands characterize the Nugget. But the lower part of the Nugget consists of sediment that seems fluvial in origin, indicating a drastically different depositional environment than the higher, eolian-dominated sands. Ichnofossil localities with trackways that have been identified as the ichnotaxon Brachychirotherium have been found in and around Dinosaur National Monument. Brachychirotherium is characterized as a quadruedal trackway with manus (hand), and pes (foot) tracks in which the pes bears a distinctive tor claw. The aetosaur Typothorax coccinarum has been proposed as the trackmaker of the Brachychirotherium tracks. Brachychirotherium has been considered to indicate a mid to Late Triassic age. If the lower unit of the Nugget Sandstone can be shown to be Late Triassic in age, its relationship to the Glen Canyon Group and the underlying Chinle Group in the Colorado Plateau region to the south can be better resolved.

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COinS
 
Mar 8th, 1:00 PM Mar 8th, 4:00 PM

Using tracks to correlate the Nugget Sandstone Formation of Dinosaur National Monument, Utah

Milo Bail Student Center Ballroom

The Nugget Sandstone Formation, in northeastern Utah has been considered to be Early Jurassic in age. Large-scale cross-bedded eolian dune sands characterize the Nugget. But the lower part of the Nugget consists of sediment that seems fluvial in origin, indicating a drastically different depositional environment than the higher, eolian-dominated sands. Ichnofossil localities with trackways that have been identified as the ichnotaxon Brachychirotherium have been found in and around Dinosaur National Monument. Brachychirotherium is characterized as a quadruedal trackway with manus (hand), and pes (foot) tracks in which the pes bears a distinctive tor claw. The aetosaur Typothorax coccinarum has been proposed as the trackmaker of the Brachychirotherium tracks. Brachychirotherium has been considered to indicate a mid to Late Triassic age. If the lower unit of the Nugget Sandstone can be shown to be Late Triassic in age, its relationship to the Glen Canyon Group and the underlying Chinle Group in the Colorado Plateau region to the south can be better resolved.