Obolon' crater is a 20 km (12 mi) diameter buried meteorite impact crater situated about 200 km (120 mi) southeast of Kiev in Ukraine (Poltava Oblast).[2] The site has been drilled, which revealed the presence of shocked minerals and impact melt rock; the high chlorine content of the latter suggesting that the area was covered by shallow sea at the time of impact.[3] One estimate puts the age at 169 ± 7 million years (Middle Jurassic).[4]