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KT Rivers

I have just been reading Gorgon and one of the things they observed in the
earliest Triassic of Karoo was a change from wide meandering rivers to
braided systems as a result of all rooted vegetation dying off for long
enough for the roots to allow all the sediment to be washed away, flooding
the rivers with sediment and precipitating the change.

Is there any evidence for this at the K/T?