File:Vertical shaft (Mammoth Dome, Mammoth Cave, Kentucky, USA) 5 (40460069751).jpg
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(photo by Ljubomir Risteski) Western Kentucky's Mammoth Cave is the longest cave system on Earth, with 412 miles known and mapped as of fall 2017. The name does not refer to the early discovery of fossil mastodon or mammoth bones here. Rather, the name refers to the immense size of many rooms and passages. The system has a variety of cave passages: tubular passages, canyon passages, vertical shafts (domepits), keyhole passages, and giant canyon passages. Mammoth Dome is a large, complexly-shaped domepit that can be viewed during the 2 hour, 2 mile long Historic Tour. Domepits are large, silo-shaped, dissolutional features in caves. They form in the vadose zone (above the water table) as downward-moving groundwater dissolves limestone. Mammoth Dome corresponds to a surface sinkhole (Mammoth Dome Sink) that can be observed along a hiking trail that originates near the park's visitor center. One measurement puts Mammoth Dome at 150 feet tall. Park signage asserts that it is 192 feet tall. Flutes are common on the walls of vertical shafts. They are vertically-oriented dissolutional grooves formed as water moves downward. The rocks in Mammoth Dome include the lower Ste. Genevieve Limestone and the upper St. Louis Limestone (both Middle Mississippian). In this photo (looking obliquely downward with the rubble-covered floor at the bottom), the Ste. Genevieve-St. Louis contact is the prominent parting near the middle (just below the whitish highlights). |
| Date | |
| Source | Vertical shaft (Mammoth Dome, Mammoth Cave, Kentucky, USA) 5 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/40460069751 (archive). It was reviewed on 13 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 17:33, 13 October 2019 | | 3,024 × 4,032 (7.51 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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