31. The studies concluded that an ancient meteorite impact crater is present in the Precambrian bedrock below the surface. 32. Devon Island is a polar desert with a meteorite impact crater that has a geology very similar to Mars. 33. The earlier theories of the crater's origin being a meteorite impact , volcanic cinder, or limestone sinkhole are now discredited. 34. Sinoite crystallizes upon meteorite impact as grains smaller than 0.2 mm surrounded by Fe-Ni alloys and the mineral enstatite. 35. One suggestion is that the bay was formed in the aftershock of a meteorite impact in the Tasman Sea. 36. The dolerite is believed to have existed as much as 1 / 2 billion years before the meteorite impact . 37. Molten terrestrial material ejected from a meteorite impact crater can cool and solidify into an object known as a tektite. 38. To create a crater of that size by meteorite impact would have required a bolide brighter than the full Moon. 39. The meteorite impact occurred about 250, 000 years ago ( Pleistocene ) on what is now the flat Karoo landscape. 40. The same mechanism is theorized to be caused by very large meteorite impacts to the extent of causing mass extinctions.
