File:Cretaceous-Tertiary (K-T) boundary clay (65 Ma, Quipar-Jorquera Formation; Agost-Castalia Road, southeastern Spain) (14617961128).jpg
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[edit]DescriptionCretaceous-Tertiary (K-T) boundary clay (65 Ma, Quipar-Jorquera Formation; Agost-Castalia Road, southeastern Spain) (14617961128).jpg |
Cretaceous-Tertiary (K-T) boundary clay from Spain. (21 millimeters thick) 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 been 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. The K-T boundary clay sample shown here is from southeastern Spain. It's a thin, poorly lithified claystone with a 2-3 mm thick yellowish/orangish-brown, oxidized, ferruginous layer at the base. The orangish stuff is the “fallout layer”. Geologists have determined it is relatively enriched in Ir, Co, Cr, and Ni. These elements are all derived from the original bolide. The fallout layer also has altered microtektite spherules. Stratigraphy: upper Quipar-Jorquera Formation, Maastrichtian Stage-Danian Stage boundary (= Cretaceous-Tertiary boundary), 65 Ma Locality: Agost-Castalla Road, 1-2 km north of the village of Agost, Alicante Province, southeastern Spain |
Date | |
Source | Cretaceous-Tertiary (K-T) boundary clay (65 Ma, Quipar-Jorquera Formation; Agost-Castalia Road, southeastern Spain) |
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@N05/14617961128 (archive). 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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current | 09:05, 1 December 2019 | 2,026 × 1,078 (955 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 17:09, 1 August 2014 |
Color space | Uncalibrated |
Image width | 2,026 px |
Image height | 1,078 px |
Date and time of digitizing | 13:09, 1 August 2014 |
Date metadata was last modified | 13:09, 1 August 2014 |
IIM version | 2 |