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File:Bentonite (105.6 Ma) in the Dakota Sandstone (Lower Cretaceous) (Dinosaur Ridge, Colorado, USA) 8 (22219878631).jpg

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Bentonite horizon in the Cretaceous of Colorado, USA.

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. The light-colored horizon with orangish-brown weathering stains is a bentonite, a lithified volcanic ash bed. Isotopic dating indicates that it is 105.6 million years old.

Stratigraphy: Dakota Sandstone, Albian Stage, upper Lower Cretaceous

Locality: near the crest of Dinosaur Ridge, between Interstate 70 and the town of Morrison, west of Denver, north-central Colorado, USA
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Source Bentonite (105.6 Ma) in the Dakota Sandstone (Lower Cretaceous) (Dinosaur Ridge, Colorado, USA) 8
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/22219878631. It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

1 December 2019

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current08:57, 1 December 2019Thumbnail for version as of 08:57, 1 December 20194,000 × 3,000 (3.9 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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