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Mitchell Caverns : ウィキペディア英語版 | Mitchell Caverns
The Mitchell's Caverns, within the Mitchell Caverns Natural Preserve, are a trio of limestone caves, located on the east side of the Providence Mountains at an elevation of , within the Providence Mountains State Recreation Area. They are located in the Mojave Desert, at the north-western end of Essex Road, off of Interstate 40 (Needles Freeway) in San Bernardino County, California. ==Geology== The caverns were created during the Pleistocene epoch, when ground water with a high carbonic acid content ate into the surrounding marble and sedimentary limestone. Stalactites, stalagmites, and other cave formations were formed from calcium carbonate left by dripping mineral water. For many years the caves were thought to be "dead", that is, the formations were no longer growing. However, recent studies have found some signs of life.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Mitchell Caverns」の詳細全文を読む
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