Dean's Blue Hole is the world's second deepest known salt water blue hole with an entrance below the sea level. It plunges 202 metres (663 ft) in a bay west of Clarence Town on Long Island, Bahamas.
Video Dean's Blue Hole
Formation
A blue hole is a water-filled sinkhole with the entrance below the water level. They can be formed in different karst processes, for example, by rainwater soaking through fractures of limestone bedrock onto the watertable. Sea level here has changed: for example, during the glacial age during the Pleistocene epoch (ice age), some 15,000 years ago, sea level was considerably lower.
Dean's Blue Hole is roughly circular at the surface, with a diameter ranging from 25 to 35 metres (82-115 ft). After descending 20 metres (66 ft), the hole widens considerably into a cavern with a diameter of 100 metres (330 ft).
The deepest known marine blue hole is Dragon Hole.
Maps Dean's Blue Hole
References
Further reading
- Wilson, William L. (1994). "Morphometry and Hydrology of Dean's Blue Hole, Long Island". Bahamas Journal of Science. 2 (1): 10-14. Archived from the original on 7 March 2012.
External links
- Dean's Blue Hole
- Dean's Blue Hole entry and exact location on Bloosee
- Vertical Blue
Source of article : Wikipedia
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