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A meteorite impact created the Hummeln structure.

Photomicrograph of a shocked quartz grain from the Hummeln impact structure.
Photomicrograph of a shocked quartz grain from the Hummeln impact structure.

In a study, published in the journal Geology, C. Alwmark and co-authors provides definite evidence for a meteorite impact origin of the Hummeln structure (located in the Småland province, Sweden), closing an about 200 years old debate. Further reading..

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