Came across some varve info - not that it's needed. Even some evolutionists have been slow/reluctant to accept the annual interpretation "hypothesis".
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But the assumption that each couplet always takes a year to form is wrong. Recent catastrophes show that violent events like the Flood described in Genesis can deposit banded rock formations very quickly. The Mount St. Helens eruption in Washington State produced eight metres (25 feet) of finely layered sediment in a single afternoon!
Source goes on to say
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Much is often made of the Green River varves,9 in Wyoming, USA. But these bands cannot possibly be annual deposits because well-preserved fish and birds are found all through the sediments.
Fossils are in indicator of rapid burial, if I may connect the dots without insulting those capable of doing it on their own.

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