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Dunbar Cave State Park is a 110 acre (450,000 m²) [1] protected area in Clarksville, Tennessee. Dunbar Cave is the 280th largest known cave complex in the world, stretching 8.067 miles (13 km) inward. The cave is located in an area of karst topography, including sinkholes, springs, and limestone bedrock.
The Douglas Lake Member is composed of a diverse set of sedimentary rocks, including rubble conglomerate, chert conglomerate, and black dolomite.In outcrops along the north shore of Lake Douglas, the chert conglomerate overlies the rubble conglomerate and both of which fill prehistoric sinkholes, called paleokarst, developed in upper surface of the Mascot Dolomite.
Bering Sinkhole – natural limestone sinkhole in Texas used for prehistoric burials [4] Big Basin Prairie Preserve – St. Jacob's Well, Kansas, a water-filled sinkhole which lies in the Little Basin, and the Big Basin, a 1.5-kilometre-wide (1 mi) crater-like depression; Blue Hole (Castalia) – a fresh water pond located in Castalia, Erie ...
Karst is made up of soluble rock types like limestone, marble and gypsum, which can dissolve or collapse over time, creating sinkholes, sinking streams, caves, springs, and other characteristic ...
Three counties in Florida's Tampa area make up a region sometimes called "sinkhole alley" because of the over 20,000 sinkholes there, almost 75% of the sinkholes in the whole state, according to ...
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The Mississippi River as well as the Tennessee and Cumberland Rivers formed and cut deep into the valleys. The Nashville Basin , which in reality is a geologic dome , was pushed up from underneath by a mantle plume , exposing softer strata that with additional erosion on the Highland Rim surrounding the basin expanded the size of the basin.
The cave has more than 9 miles (14 km) of surveyed passages, making it the longest continuous cave in the Tennessee Central Basin region. It is part of a system of caves known to have more than 13 miles (21 km) of passages. [1] The mouth of Snail Shell Cave is a sinkhole, with nearly vertical walls, 125 feet in diameter and 60 feet deep.