Re: Re: OT-CHAT: calcium in water

Linda  --  Your remarks put me in mind of the time I first found a sea shell
sticking out of a cave wall in Indiana.  --  Griff


----- Original Message -----
From: "Linda Mann" <lmann@volfirst.net>
To: "iris- talk" <iris@hort.net>
Sent: Friday, February 27, 2004 2:36 PM
Subject: [iris] Re: OT-CHAT: calcium in water


> In addition to uplift and subsidence, there were also cycles of rise and
> fall of ocean levels with global warming and cooling cycles.
>
> I had never really thought about it before - the glaciers reworked
> surface geology so much in the northern US, that I had never realized
> that there could still be intact limestone bedrock underlying glacial
> deposits.  And I didn't realize there was open water all the way up the
> middle of the continent.

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