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A subterranean river in the Cross Cave system of Slovenia. (Scale shown by people in photograph.) A subterranean river (also known as an underground river) is a river or watercourse that runs wholly or partly beneath the ground, one where the riverbed does not represent the surface of the Earth. It is distinct from an aquifer, which may flow ...
Moaning Caverns is a solutional cave located in the Calaveras County, California, near Vallecito, California in the heart of the state's Gold Country. It is developed in marble of the Calaveras Formation. It was discovered in modern times by gold miners in 1851, but it has long been known as an interesting geological feature by prehistoric peoples.
The rock overhangs and caves have fire-scarred roofs that bear evidence of occupancy over hundreds of years. Researchers have identified a village named Trh’ama at Wagon Cave, between Rattlesnake Creek and the North Fork of the San Antonio River. Maria Jesusa Encinales stated that it was “the big rock where they keep the wagons”.
Derrick Cave. Fort Rock Cave. Horse Lava Tube System. Lava River Cave. Oregon Caves National Monument. Paisley Caves. Redmond Caves. Sandy Glacier Caves. Sea Lion Caves.
Black Chasm Cavern is a dissolution cave, formed by carbonic acid eroding the subterranean bedrock. This eroded the limestone bedrock to form small to very large chambers. It is formed in what is considered to be part of the Calaveras Complex. The crystal structure of the metamorphic rock has changed over time, and it is now properly referred ...
Fee. Crystal Cave is a marble karst cave within Sequoia National Park, in the western Sierra Nevada of California. It is one of at least 240 known caves in Sequoia National Park but the only one accessible to the public. Crystal Cave is in the Giant Forest area, between the Ash Mountain entrance of the park and the Giant Forest museum.
The Black Diamond Mines Regional Preserve is a 6,000-acre (2,400 ha) park located north of Mount Diablo in Contra Costa County, California under the administration of the East Bay Regional Park District (EBRPD). The district acquired the property in 1973. The preserve contains relics of 3 mining towns, former coal and sand mines, and offers ...
The Upper Las Virgenes Canyon Open Space Preserve is a large open space nature preserve owned and operated by the Santa Monica Mountains Conservancy spanning nearly 3,000 acres (1,200 ha) in the Simi Hills of western Los Angeles County and eastern Ventura County. Originally part of Ahmanson Ranch, this area was sold by Seattle -based Washington ...