As the valley sank, it was filled by sediments that were eroded from the surrounding hills; in the central part of the valley the bedrock floor is buried beneath as much as 9,000 feet (2,745 metres) of sediment.
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A type of fault activity called block faulting, in which the movement is predominantly vertical, began to form the valley about 30 million years ago. As crustal blocks sank, they formed the great trough of the valley, and other blocks were uplifted to gradually form the adjacent mountain ranges.
Southern California hiker, 71, dies after trek in blistering Death Valley heat. DEATH VALLEY, Calif. (AP) — A Southern California outdoor enthusiast died Tuesday after collapsing following an hours-long hike in Death Valley National Park, the world's hottest place.
Death Valley Groundwater Basin underlies a northwest-trending valley in eastern Inyo and northern San Bernardino Counties. Elevation of the valley floor ranges from 282 feet below mean sea level at Badwater to about 4,000 feet above mean sea level at the north end of the valley.
At Badwater, significant rainstorms flood the valley bottom periodically, covering the salt pan with a thin sheet of standing water. Each newly-formed lake does not last long though, because the 1.9 inches of average rainfall is overwhelmed by a 150-inch annual evaporation rate.
Badwater Basin, the lowest point on the continent, is a small spring-fed pool in a drainage basin. It gets its name from the salts surrounding it, making it undrinkable. The salt flats adjacent to the basin have a thin crust of hexagonal-shaped crystallization. This area of the valley can be hazardous to traverse.
Devils Hole itself is a water-filled cavern cut into the side of a hill. The cavern is over 500 feet (152 m) deep and the bottom has never been mapped. Devils Hole provides its resident pupfish with conditions of constant temperature (92°F, 33°C) and salinity, unlike the fluctuating environments of many other pupfish.
At 282 feet (86 meters) below sea level, Death Valley might be expected to be filled with water. But the desert is subject to a rain shadow effect, as humid air masses traveling east from the Pacific Ocean must cross four mountain ranges before they reach the desert valley.
The Sahara Desert falls within this region, yet Death Valley, California still records higher temperatures. The explanation is simple. Throughout the Sahara desert, especially the very hot areas, it is difficult to go there to record temperatures or even maintain an automotive weather station.