File:Morrison Formation (Upper Jurassic; No Thoroughfare Canyon, Colorado National Monument, Colorado, USA) 7 (23587807149).jpg

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Colorado National Monument is a colorful and scenic park just southwest of the town of Grand Junction in western Colorado, USA. It's located in the northeastern part of the Colorado Plateau Physiographic Province, a large section of continental crust that was significant uplifted during the Cenozoic. The rocks in the park are gently folded into a large monocline that has been erosionally dissected into a series of dramatic canyons.

The outcrops shown above are shale-dominated slopes of the Morrison Formation, an Upper Jurassic succession that is widely distributed in many western American states. The Morrison consists of fluvial (river/floodplain) and lacustrine (lake) deposits, plus reddish-colored paleosol horizons. Dinosaur bones and dinosaur tracks are moderately common in Morrison Formation sediments (exceptionally rich localities include Como Bluff in Wyoming, Dinosaur National Monument in Utah, Dinosaur Ridge in Colorado, and the Cleveland-Lloyd Quarry in Utah).

Stratigraphy: Morrison Formation, Kimmeridgian Stage, middle Upper Jurassic, ~150 to 156 Ma

Locality: No Thoroughfare Canyon, southeastern Colorado National Monument, southwest of the town of Grand Junction, west-central Mesa County, far-western Colorado, USA
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Source Morrison Formation (Upper Jurassic; No Thoroughfare Canyon, Colorado National Monument, Colorado, USA) 7
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@N05/23587807149 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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Date/TimeThumbnailDimensionsUserComment
current03:59, 6 December 2019Thumbnail for version as of 03:59, 6 December 20193,005 × 1,810 (3.25 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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