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Showing results for tags 'k-t boundary'.
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From the album: Dinosaurs
K-Pg Boundary Microtektites Hell Creek Formation Garfield Co., MT, USA These aren't fossils, but are relevant to the extinction of the non-avian dinosaurs, pterosaurs, large marine reptiles, and many other species of flora/fauna at the end of the Cretaceous. When a large meteor/asteroid struck the earth ~ 66 mya, it sent molten ejecta across the world. Some of this molten material, sourced from the impact site, was shaped by its trajectory through the atmosphere and cooled into small, glassy droplets. The black blobs you see are those droplets, called tektites (each typically ~ 1 mm in diameter). The layer which these came from is more famous for its unusually high concentration of iridium (which is more common in meteorites than on Earth). However, in some locations, tektites have been preserved. In this matrix sample, I've also found carbonized plant material (charcoal), which suggests fires that could be associated with the impact event.- 8 comments
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- cretaceous extinction
- dinosaur extinction
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Cone shaped thing in matrix from Seymour Island, Antarctica
David Cothran posted a topic in Fossil ID
Near the K-T boundary there; below, I think. A solitary rugose coral? But the striations look wrong to me. Loose on surface.- 3 replies
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- antarctica
- k-t boundary
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Leaf fossils show severe end- Cretaceous plant extinction in Southern Argentina
Thecosmilia Trichitoma posted a topic in Fossil News
The article from Science Daily= https://www.sciencedaily.com/releases/2021/01/210105130123.htm The Source Paper= https://www.cambridge.org/core/journals/paleobiology/article/cretaceouspaleogene-plant-extinction-and-recovery-in-patagonia/94645848E3BE16AC818320248C725734 (I found this paper to be quite well written, and would recommend you read it too.)-
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- 92% of plant species extinct
- k-t boundary
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