File:Cretaceous-Tertiary boundary clay (65 Ma; near Trinidad Lake, Colorado, USA).jpg

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English: Cretaceous-Tertiary (K-T) boundary clay from Colorado, USA.

Earth experienced a major mass extinction 65 million years ago, at the Cretaceous-Tertiary (“K-T”) boundary. The most famous victims of this event were the dinosaurs, but many other groups of organisms also disappeared. The cause of the K-T extinction has long been a major mystery in geology.

Starting in the late 1970s, abundant evidence has accumulated indicating that the dinosaurs & company were wiped out by the effects and aftermath of a gigantic impact event. An approximately 6-mile large object (“bolide”) hit what is now Mexico’s Yucatan Peninsula to form the Chicxulub Crater. Enormous quantities of debris were kicked up into the atmosphere. This material settled out all over Earth to form the K-T boundary clay.

Locality: roadcut on the western side of Long Canyon Road, southwest of the western end of Trinidad Lake, southwestern Las Animas County, southern Colorado, USA (37° 07’ 28.88" North latitude, 104° 37' 20.19" West longitude)
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Source https://www.flickr.com/photos/jsjgeology/49962117016/
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@N05/49962117016. It was reviewed on 2 June 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

2 June 2020

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current11:20, 2 June 2020Thumbnail for version as of 11:20, 2 June 20202,033 × 1,157 (1.97 MB)FunkMonk (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/jsjgeology/49962117016/ with UploadWizard

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