To manyee: TravertineSunToucher::2006-07-25 13:55
It is the sediment of the water that creates these structures. So basically the rock that you see.

Thanks for the question, I'll include some information about it in the notes
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Title: Travertine FallsCanon EOS 350D
Travertine Falls (18)
SunToucher Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2385 W: 237 N: 3033] (11162)
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To manyee: Travertine SunToucher Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2385 W: 237 N: 3033] (11162)::2006-07-25 13:55