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The Mammoth Site is a museum and paleontological site near Hot Springs, South Dakota, in the Black Hills. It is an active paleontological excavation site at which research and excavations are continuing. The facility encloses a prehistoric sinkhole that formed and was slowly filled with sediments during the Pleistocene era.
The Black Hills is an isolated mountain range rising from the Great Plains of North America in western South Dakota and extending into Wyoming, United States. [3] Black Elk Peak, which rises to 7,242 feet (2,207 m), is the range's highest summit. [4]
After a series of devastating wildfires in 1893, U.S. President Grover Cleveland created the Black Hills Forest Reserve on February 22, 1897. [5] U.S. President William McKinley issued a presidential proclamation on September 19, 1898, appending the Black Hills Forest Reserve geographic boundaries while acknowledging the forest preservation decrees established by the Timber Culture Act and ...
The Tin Mountain pegmatite is an igneous intrusion located in the southern Black Hills, South Dakota. It is a part of the Harney Peak Granite dome that formed in the Late Paleoproterozoic around 1.7 billion years ago. [1] [2] [3] The Harney Peak Granite system includes thousands of pegmatites, one of which is the Tin Mountain. [1]
Boesmansgat (or Bushmansgat), also known in English as "Bushman's Hole", is a deep submerged freshwater cave (or sinkhole) in the Northern Cape province of South Africa, which has been dived to a depth of 282.6 metres (927 ft). Boesmansgat was believed to have first been explored by amateur diver Mike Rathbourne, in 1977.
The Pocasset Water Quality Coalition is concerned about water quality in Bourne's Hen Cove. Now they have a grant to help do something about it.
Mud was already flowing across the Hollywood Hills, damaging homes and forcing residents to flee. In Studio City late Sunday, a debris flow sent mud and other objects flowing down the 11900 block ...
The faults and joints are associated with the uplift of the Black Hills approximately 58 to 54 million years ago. After main cave dissolution, a thick layer of calcite lined the walls about 2.5 million years ago. [11]: 12 During cave development and afterwards, speleothems and speleogens formed, including the "jewels" or spar.