|Tin Bider crater
|6 km (3.7 mi)
Tin Bider (Arabic : تين بيدر) is an impact crater that sits in dry, rugged terrain in Algeria. The crater was formed in the last 70 million years, perhaps in the late Cretaceous or early Tertiary Period. Spanning 6 kilometres, the crater sits at the southern end of a range of hills. The elevated position and concentric rings of Tin Bider suggest that its structure is complex.
Massive sandstones attributable to the Lower Cretaceous, known throughout the Sahara, are only exposed in the craters centre, about 500 meters above its usual stratigraphic position.
Because of the large prominence of ductile deformation, Tin Bider significantly differs from other craters. While there is yet no conclusive explanation for this unique condition, Tin Bider could provide important information toward a better understanding of large-scale impact cratering.
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Tabun-Khara-Obo is an impact crater in the Dornogovi Aimag (province) the south-east of Mongolia. The crater, which is exposed at the surface, is 1.3 km (0.81 mi) in diameter. The crater's rim rises some 20 to 30 metres above the crater bottom, but the bottom of crater is covered with up to 171 metres (561 ft) thick layer of lake deposits - a testimony that this crater in earlier times was filled with a lake.
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