Despite the number of probable and certain impacts we have mentioned, and the abrupt and important changes in atmospheric and marine environments which are registered in the geological record, probably the most important single element which has helped geologists to discriminate against the importance of impact tectonics on Earth is the apparent lack of circular or inter-linked features on Earth, which are such an obvious feature of the Moon. Even when maps and aerial or satellite images of Earth are studied, such obvious and abundant evidence of circular features is not readily apparent.
As we have already noted, there are several causes for such an apparent difference in the degree of development of such impact features on the Earth relative to those of its satellite. However, these can sound like excuses. So let us see what evidence exists of Moon-like crater patterns on Earth.
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