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SEM of magnetites from KT Boundary

SEM of magnetites from KT Boundary

E410/0078

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Credit

CATHERINE POUEDRAS / EURELIOS / SCIENCE PHOTO LIBRARY CATHERINE POUEDRAS / EURELIOS / SCIENCE PHOTO LIBRARY

Caption

Evidence for dinosaur extinction by an asteroid scanning electron micrograph of a particle of magnetite a few microns in diameter, found in the layer between Cretaceous and Tertiary rocks. This layer, the K/T boundary, is a clay deposited at the end of the Cretaceous about 65 million years ago. The microscope used to make this image was linked to a microspectrometer to study the composition of the magnetite. The high nickel content discovered showed that the magnetite was extraterrestrial in origin. This supports the asteroid impact theory for the mass extinction of the dinosaurs.

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Model release not required. Property release not required.

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