With an unusually large concentration of more than 300, shields are the formations that Lehman Caves is best known for. Shields consist of two round or oval parallel plates with a thin medial crack between them. They grow at all sorts of angles from the ceiling, wall, and floor of the cave, may be decorated with popcorn or helictites on the top and along the medial crack, and draperies and stalactites on the bottom. One shield found in the Grand Palace, Parachute Shield, has become the symbol for Lehman Caves National Park.
For more information, see Cave Shields: The Wonder of Lehman Caves by the US Park Service.
Great Basin National Park, Nevada USA
Shot handheld using Canon EOS 40D with Canon EF75-300mm f/4.0-5.6 IS USM lens
Focal length 75mm, ISO 1000, 1/25 sec at f/5.6
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Post Card Style August 18 2012