File:Giant canyon passage (Cyclops Gateway, Mammoth Cave, Kentucky) (38107711391).jpg
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| Description |
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 is famous for having giant canyon passages. Canyons are taller than they are wide. Giant canyons often have a boxy or rectangular cross-section because they are significantly filled with sediments and breakdown - often more than 50% filled. At one site (at least), about 80 feet worth of fill is present. Shown above is the entrance to Cyclops Gateway, a giant canyon that intersects with Main Cave, the main trunk in Mammoth Cave Ridge. Dim lighting makes photography difficult. A subterranean river used to flow through here. The dust-covered rocks in the foreground are breakdown slabs. Modern cave tours do not enter this passage Cyclops Gateway and Main Cave are at level B in the Mammoth Cave system, which is the 2nd-oldest and the 2nd-elevationally highest set of passages. Level B passages started forming during the Pliocene, 2 to 4 million years ago. The ceiling and walls of Cyclops Gateway and Main Cave consist of marine limestones of the upper Ste. Genevieve Limestone (upper Middle Mississippian). Locality: mouth of Cyclops Gateway, as seen from Main Cave, north-northwest of Giant's Coffin, Mammoth Cave Ridge, Mammoth Cave National Park, western Kentucky, USA |
| Date | |
| Source | Giant canyon passage (Cyclops Gateway, Mammoth Cave, Kentucky) |
| 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@N05/38107711391 (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 | |
|---|---|---|---|---|---|
| current | 17:36, 13 October 2019 | | 4,000 × 3,000 (6.4 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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