texascavers Digest 17 Jan 2010 18:17:57 - Issue 948
Topics (messages 13308 through 13315):
Re: Feds step in to protect Texas endangered cave species :
13308 by: Corky
13311 by: Fritz Holt
Before and After satellite overlays of Haiti
13309 by: Gill Edigar
Edwards
I recall some years ago—I think in a show cave called Colossal Cave in
Arizona—a tour guide mentioned that cave shields are somewhat rare.
Since then, I seem to see them frequently enough.
I am wondering if anyone has empirical data, or even an educated guess, that
considers the rarity or
Some years ago would be in the 1960-70's. When Carol Hill described
them in her first Cave Minerals book we thought they were mostly known
in one of southern Arizona's caves which was also compared to the
Caverns of Sonora. Several of us from TX made a trip to see this new
speleothem. It
Some folks say shields are rare. I've found them rare regionally. In
some regions, and some caves in particular, they are amazingly abundant
and large. For example, Grand Caverns, Virginia, and some caves in China
come to mind. In other regions they are absent. Cave mineralogists have
different
When you take the tour at Grand Caverns in VA, the guide tells you that the
cave has more cave shields than any other in the world. Don't know if that
is true, but there are probably hundreds. Someone counted a few years ago
when it was resurveyed, but I can't remember the number was. Some are
California Underground Adventure: A Guide to Caves, Mines and Lava
Tubes. Jon Kramer and Julie Martinez. Adventure Publications,
Cambridge, Minnesota; 2009. ISBN 978-1-59193-230-7. 6 by 9 inches, 184
pages, softbound. $16.95.
A travelers' guide to various sites in California, including
