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Rochechouart impact structure or Rochechouart astrobleme is an impact structure in France. Erosion has over the millions of years mostly destroyed its impact crater, the initial surface expression of the asteroid impact leaving highly deformed bedrock and fragments of the crater's floor as evidence of it.
Rochechouart is situated in the Rochechouart impact structure, an impact crater caused by an asteroid that crashed into the Earth's surface about 205 million years ago, [9] [10] in the Rhaetian period, shortly before the Triassic Jurassic boundary characterized by a massive extinction event in which 80% of the world's species were obliterated. [11]
The EID lists fewer than ten such craters, and the largest in the last 100,000 years (100 ka) is the 4.5 km (2.8 mi) Rio Cuarto crater in Argentina. [2] However, there is some uncertainty regarding its origins [ 3 ] and age, with some sources giving it as < 10 ka [ 2 ] [ 4 ] while the EID gives a broader < 100 ka.
At the west end of the department is the Rochechouart impact structure, an impact crater caused by a meteorite that crashed into the Earth's surface over 200 million years ago; because of subsequent erosion, little sign of the crater is in evidence today apart from the geologic effects on the surrounding rock. [5]
[340] [341] [342] However, the source of the young (less than a million years old) and enormous Australasian strewnfield (c. 790 ka) is suggested to be a crater about 100 km (62 mi) across somewhere in Indochina, [343] [344] with Hartung and Koeberl (1994) proposing the elongated 100 km × 35 km (62 mi × 22 mi) Tonlé Sap lake in Cambodia ...
The impactite, which is part of the Rochechouart impact structure, was quarried north-west of Rochechouart near Chassenon, was the stone principally used in the building of the monumental Roman baths of Cassinomagus. [3]
Reidite from Rochechouart impact structure has also been reported as bladed, wedged, and massive. [ 11 ] Libyan desert glass may show lattice deformation in zircon that is interpreted as evidence of this material having previously contained reidite, and as such constitutes strong evidence for its impact origin.
Alga crater on Mars is a possible site for preserved ancient life, after detection of an impact glass deposit. [4] Impactite has been found, for example, at the following impact craters and structures: Alamo bolide impact (Late Devonian), Nevada, United States; Alga crater on the planet Mars [4] Barringer crater, Arizona, United States [7]