Formations really do match detailed lab expts of sorting under rapid currents

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What this means is that when we see 300 foot of sandstone, 300 foot of shale and 300 foot of limestone

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Did I hear you say "limestone?" Answer me, please, in the "general flood topic," this forum, post 17 and thereafter. Where does limestone come from?

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If I undersatnd it correctly, your explanation instead requires millenia of sandstone, then millenia of shale and then millemnia of limestone, completely arbitarily.

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I wouldn't say completely arbitrarily. We have many modern examples of similar sequences that seem to be forming agonizingly slowly. Show me a way to form a lot of that limestone quickly. Or shale, for all that...

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Originally posted by Tranquility Base:
Coragyps

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See my answer to Edge on calcium sources.

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When did those shells find time to grow? Where will you get the dissolved calcium, and what will you do with the emitted carbon dioxide, from either their growth or from chemical precipitation? "General Flood Topic", post 17 and following, please.