File:Radioactive sauropod dinosaur bone in sandstone (Morrison Formation, Upper Jurassic; Dinosaur Ridge, west of Denver, Colorado, USA) (15693894957).jpg

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The dark brown structure in the rock is a radioactive dinosaur bone, hosted in fluvial sandstones of the Morrison Formation (middle Upper Jurassic) at Dinosaur Ridge, near Denver, Colorado, USA. Dinosaur bones are common in this sandstone unit - they have been partially permineralized/replaced by the radioactive, uranium-bearing mineral carnotite. Scintillometer reading on a bone here: 422 counts per minute (cf. background reading of 140 cpm).

The bone is a pubic bone from a sauropod dinosaur, probably Atlantosaurus.
Date
Source Radioactive sauropod dinosaur bone in sandstone (Morrison Formation, Upper Jurassic; Dinosaur Ridge, west of Denver, Colorado, USA)
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15693894957 (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
current03:57, 6 December 2019Thumbnail for version as of 03:57, 6 December 2019959 × 702 (278 KB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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