The largest and oldest meteorite impact structure in the world has apparently been discovered through research on the formation of gold deposits in the Western Australia Eastern Goldfields. Located in the eastern Yilgarn, the Watchorn Impact Structure (WIS) is 560 km in diameter at its widest point and estimated to be more than 2.6 billion years old. Bob Watchorn indicated that he located where the rings should cut roads... [and] he observed the lines of hills heading perpendicular to the trend of hills in the eastern Yilgarn, which is usually north-south. On the northern rings especially, he could see large in situ shatter cones and striated rocks and various other prima facie evidence of a big impact. He said that it was satisfying to find the prima facie evidence on the interpreted Landsat rings when he has had so many eminent geologists and geophysicists say that they could not see any circular features. He says the link between mineral deposits and the rings of the WIS could impact mineral exploration in WA.
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