At 02:12 PM 3/18/2003 -0800, Winsor Crosby wrote:
>On Tuesday, March 18, 2003, at 01:35 PM, Garth Wood wrote:
>
>>At 01:27 PM 3/18/2003 -0800, you wrote:
>>>As others have already intoned, amazing stuff. What are Tufa layers?
>>
>>
>>A type of limestone which forms exclusively underwater. There's lots of tufa
>>in the American Southwest (which was once mostly underwater in a vast inland
>>sea) -- the Anasazi people used to burrow into cliff walls which were
>>essentially tufa in order to create cliff-dwellings.
>>
>>Garth
>All the cliff dwellings I have seen are in sandstone. Not tufa which is
>calcium carbonate.
Sure, whatever.
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