There does not seem to be any good web pages on submarine canyon formation, but turbidity currents seem to be deemed the primary errosive force, in their formation.
Turbidity currents happened in the Archean (I just got done looking at some turbidite deposit rocks, on Saturday). They've happened throughout geologic history, and they continue to happen in these modern times.
Now, what does this have to do with the topic?
Moose
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BS degree, geology, '83
Professor, geology, Whatsamatta U
Old Earth evolution - Yes
Godly creation - Maybe