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 in diameter. The crater's rim rises some above the crater bottom, but the bottom of crater is covered with up to thick layer of lake deposits - a testimony that this crater in earlier times was filled with a lake. It has an estimated age of 150 ± 20 million years (Middle Jurassic to Early Cretaceous). The site was first identified as a probable impact crater in the 1960s, although confirmation of the hypothesis only occurred decades later. Drilling at the site in 2008 revealed rock features consistent with high-speed impacts such as those caused by meteorites. References Further reading Amgaa, T., Koelberl, C., Anonymous, Geology and petrography of Tabun Khara Obo Crater (abstract). Meteoritics & Planetary Science, vol. 44, abstract 5019 Amgaa, T., Koelberl, C., Anonymous, Impact origin of Tabun Khara Obo Crater, Mongolia, confirmed by drill core studies. (Abstract). Geological Society of America, vol. 41, pp. 533. 2009 McHone, J. F., Dietz, R. S., Tabun Khyara Obo crater, Mongolia: Probably meteoritic. Meteoritics, V. 11, pp. 332–333. 1976 Shkerin, L. M., Geological structure of the crater-like feature Tabun Khara Obo (south east Mongolia) (in Russian). Meteoritika, v. 35, pp. 97–102. 1976 Suetenko, O. D., Shkerin, L. M., A proposed meteorite crater in southeastern Mongolia (in Russian). Astronomischeskii Vestnik, v. 4, pp. 261–263. 1970 Impact craters of Mongolia Jurassic impact craters Mesozoic Mongolia