Asteroid crater on Earth provides clues about Martian craters

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The volcanic ash, a very light rock, consists of nitrogen-rich silicate minerals
The volcanic ash, a very light rock, consists of nitrogen-rich silicate minerals (white) and dark mica crystals. Photo: Gernot Arp, University of Göttingen
Research team led by the University of Göttingen discovers crater floor sagging from bowl-shaped volcanic ash layer

The almost 15-million-year-old Nördlinger Ries is an asteroid impact crater filled with lake sediments. Its structure is comparable to the craters currently being explored on Mars. In addition to various other deposits on the rim of the basin, the crater fill is mainly formed by stratified clay deposits. Unexpectedly, a research team led by the University of Göttingen has now discovered a volcanic ash layer in the asteroid crater. ...
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