Bioturbated sandstone (Dakota Sandstone, Lower Cretaceous; Dinosaur Ridge, Colorado, USA) 1

            Invertebrate trace fossils in quartzose sandstone in the Cretaceous of Colorado, USA. (geology hammer for scale)

The outcrop shown above is part of Dinosaur Ridge (a section of the Dakota Hogback), which is a north-south trending ridge of eastward-dipping Mesozoic sedimentary rocks.  Triassic, Jurassic, and Cretaceous rocks are present, tilted by Laramide Orogeny uplift during the Cenozoic (the Front Range of the Colorado Rocky Mountains is immediately west of here).

This exposure consists of structurally tilted beds of the Dakota Sandstone, a Lower Cretaceous succession of nearshore terrestrial to intertidal to shallow marine quartz sandstone deposits.  Some Dakota Sandstone beds are heavily bioturbated, some with dinosaur tracks and some with invertebrate trace fossils.  Identified invertebrate traces include Zoophycos, Arenicolites, Diplocraterion, and vertical burrows.  These ichnogenera are shallow shoreface traces.

Stratigraphy: Dakota Sandstone, Albian Stage, upper Lower Cretaceous

Locality: eastern side of Dinosaur Ridge, between Interstate 70 and the town of Morrison, west of Denver, north-central Colorado, USA

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Taken on: December 16, 2012

Tags:

Dinosaur

Ridge

Hogback

sandstone

sandstones

Cretaceous

fossil

fossils

trace

traces

ichnofossil

ichnofossils

Colorado

bioturbation

bioturbated « less

Sets appears in: • Colorado Rocks & Fossils • Cretaceous Rocks, Minerals, Fossils more » • Dakota Sandstone (Cretaceous; western USA) • Traces & Trace Fossils • Dinosaur Ridge (Colorado, USA) « less

Groups appears in: • Earth Science Teaching Resource

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