This is actually a more general point: there are lots and lots of
impact
craters but very few tektite producing ones; why?
Sterling K. Webb
Why not very high velocity comet impacts, at a near vertical angle.
Maximum cometary velocities would be about 10 times more than average
asteroidal impacts. Near vertical would reduce the atmospheric
column that the explosion has to punch thru to the minimum.
Looked at from this point of view, perhaps only 1 in 100 crater
producing impacts would qualify, which might explain why there are
many large craters, but few tektite strewn fields.
Mike Fowler
Chicago
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