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Creationist Friendly Q&A

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Author Topic:   Creationist Friendly Q&A
Coragyps
Member (Idle past 756 days)
Posts: 5553
From: Snyder, Texas, USA
Joined: 11-12-2002

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Message 21 of 25 (190122)
03-04-2005 8:36 PM 		Reply to: Message 19 by Monk
03-04-2005 6:55 PM

There may well have been a change in ocean/atmospheric chemistry at about the time of the early Cambrian that actually allowed critters to make calcium carbonate shells for the first time, too. Before that time, the seas were apparently a little more acidic, and solid calcium carbonate wouldn't have been stable.
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Now exactly where I read the details of how this is known is a mystery to me at the moment......
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