Template:Geobox The Old Woman Mountains are located south of the town of Essex, California, and north of Danby Dry Lake. The range reaches an elevation of 3,720 feet (1,130 m) at the northeastern end (Mercury Mountain), and lies in San Bernardino County in the Mojave Desert.
The mountain range is approximately 15 miles (24 km) wide east to west at the widest point, and 25 miles (40 km) in length from north to south. The mountains receive very little precipitation, with just 4-10 inches of rain falling in a normal year. The Old Woman Statue, a prominent rock formation, is found on the eastern side of the range about two miles (3 km) south of Paramount Spring. The Old Woman Mountains Wilderness area is also part of the range.
The lower elevations of the range are dominated by Creosote bush scrub, with juniper-pinyon woodland found in the higher elevations. The dry washes are characterized by catclaw acacia, cheesebush, desert lavender, little-leaf ratany, and desert almond.
Animals found in the mountains include: bighorn sheep, mule deer, bobcats, cougars, coyotes, black-tailed jackrabbits, ground squirrels, kangaroo rats, and several species of lizards.
Numerous raptor species are likely to be found in the area; including prairie falcons, red-tailed hawks, golden eagles, Cooper's hawks, American kestrels, as well as several species of owls. The washes and canyons provide good habitat for several species of songbirds, and the bird densities and diversity is further enhanced by the presence of the known 24 springs and seeps.
The mountains were the discovery site of the Old Woman Meteorite, the largest meteorite ever found in the state. The meteorite is now on display at the Desert Information Center in Barstow, California.
The Old Woman Mountains are one of several ranges that constitute the Maria Fold and Thrust Belt. The Maria Fold and Thrust Belt underwent generally thick-skinned (involving basement rocks) North-South trending crustal shortening in the Cretaceous, followed by generally East-West trending large-scale crustal extension in the Miocene. This North-South shortening is anomalous, as crustal shortening in the rest of the North American Cordillera is oriented generally East-West because of the generally East-West compression that was due to the subduction of the Farallon plate under western North America. Also unlike the rest of the North American Cordillera, deformation in the Maria Fold and Thrust Belt involved rocks of the North American Craton, most notably the Grand Canyon sequence of sedimentary rocks.
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