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Reasonable, yes, since Lake Erie is also terrestrial?
Perhaps reasonable. You realize that there are few craters on Earth and plenty on other planets, therefore, you could find a lot of better arguments than simply saying that this doesn't look like terrestrial craters. That there are no blatantly elliptical craters is not evidence against a proposed crater merely because it is elliptical. In fact, I have heard that there's a possible elliptical in South America, and meteoritic material has been found.
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Ok, but I am missing why this is important given that we are talking about the Earth at a time when it had pretty much the same atmosphere as now?
I feel that it is important to point out that there may be a reason why there are no known ellipticals. I am not claiming that there are no ellipticals to find or that they cannot be produced in our atmosphere however it is a distinct possibility that there are no ellipticals to find.
I personally am sitting on the fence.
[This message has been edited by gene90, 01-12-2003]