Evidence that huge 2-mile wide meteorite smashed into Earth only 800,000 years ago.

Might as well have been yesterday, in geological terms… – Paul

Published 30/12/19 in PNAS (Proceedings of the National Academy of Sciences of the United States of America)

A field of black glassy blobs, strewn across about 20% of Earth’s Eastern Hemisphere, resulted from the impact of a large meteorite about 790,000 years ago. The large crater from which these tektites originated has eluded discovery for over a century, although evidence has long pointed to a location somewhere within Indochina, near the northern limit of the strewn field. We present stratigraphic, geochemical, geophysical, and geochronological evidence that the ∼15-km diameter crater lies buried beneath a large, young volcanic field in Southern Laos.

The Bolaven Plateau volcanic field likely buries the impact crater that produced the tektites of the Australasian strewn field. It is the only adequately large and thick postimpact deposit on the Khorat Plateau, the largest region of plausible target rocks. It is also the only thick, postimpact deposit within the inner Muong Nong strewn field, the region containing exclusively nonaerodynamically shaped Muong-Nong–type tektites (circumscribed by the blue ellipse). Tektite data find locations data from this study. Outline of the Khorat Plateau data finds of Australasian tektites and microtektites (white dots) define an asymmetric strewn field (blue).

https://www.pnas.org/content/early/2019/12/24/1904368116

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