Our first geology stop today is a one-hour caving trip thru Crystal
Cave. It has formed in marble and is bounded by schists; in the
Junction Room you can see this contact. In the Organ room there are
glittering growths of bacteria (not gold), in addition to the
beautiful cave formations. In the Dome Room we talked about
phosphourescent formations (but didn't have a good enough light to
activate them.) In Marble Hall we talked about the vast number of
endemic cave species in this park. A very informative -- and
welcomingly chilly -- deviation from surface geology.
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