*ping*
Thanks fieldmarshaldj. Sounds like a kludge, just as similar ideas did to me 30 years ago.
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Thanks fieldmarshaldj.
If the Grand Canyon is, say, forty million years old and Ice Ages occur, say, every forty thousand years, then the Grand Canyon must have been covered with ice over a thousand times in its history. Odd that the Colorado River can leave its mark, but being covered by an ice pack a mile thick a thousand times -- for centuries at a time -- does not. [JoeSchem]