'Although Arches is in the Great Basin Desert, it
is a cool desert and a high one. The most common
plant community here is a pygmy forest of Juniper
and Pinion Pine, which covers forty percent of
the park. More than 350 other plant species
thrive here as well, including Yuccas,
Blackbrush, Indian Paintbrush, Dropseed, Indian
Ricegrass, Prickly Pear Cactus, Rockrose and
Mormon Tea. A diverse profusion of wildflowers
also bloom from April through June including
Larkspur, Prince's Plum, Peppergrass, Mule-ears
and Columbine. Willows and non-native Tamarisk
line the riverbanks and narrow floodplains. Most
species of mammals are nocturnal in Arches, but
you might also see Mule Deer, Kit Fox,
Jackrabbits, Desert Cottontails and Kangaroo
Rats. The Western Rattlesnake, Collared Lizard,
Red-spotted Toad and Tadpole Shrimp are also
common.' (With acknowledgement to the Arches
National Park Website)
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Balanced Rock is a good example of the geological
feature called a hoodoo. It is formed by both
wind erosion, and erosion by water seepage. A
resistant block of Slickrock Sandstone (from the
Entrada layer) is balanced on a softer layer of
Dewey Bridge Beds, which in turn rests on a
Navajo Sandstone base. The huge cap rock weights
3500 tons and stands 55 feet high.
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