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Black Chasm Cave : ウィキペディア英語版 | Black Chasm Cave
Black Chasm Cavern is a cave nestled in the hamlet of Volcano, located in Amador County, California. ==Geology== Black Chasm Cavern is a dissolution cave, formed by carbonic acid eroding the subterranean bedrock. It is considered part of the (Calaveras Complex ), however, the crystal structure of the rock has changed over time, which is classified as metamorphic and is now properly referred to as marble. Many lakes make up the lower levels of the cavern. The calcite formations in Black Chasm Cavern are derivative of the marble bedrock, containing primarily calcium or calcium carbonate (CaCO3). There are a variety of formations in Black Chasm Cavern, including stalactites, stalagmites, columns, flowstone, draperies, ribbons, angel's wings, cave bacon, soda straws, helictites, false floors, and numerous fun shapes that encourage one's imagination.
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「Black Chasm Cave」の詳細全文を読む
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