File:Acute Angle (Main Cave, Mammoth Cave, Kentucky, USA) 1 (38202307382).jpg
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[edit]DescriptionAcute Angle (Main Cave, Mammoth Cave, Kentucky, USA) 1 (38202307382).jpg |
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. Shown here is Main Cave, the principal trunk passage in the Mammoth Cave Ridge part of the system. The rocks are gray, marine limestones of the upper Ste. Genevieve Limestone (upper Middle Mississippian). Dim lighting makes photography difficult. The projecting wall near the center of the photo is "Acute Angle". At this site, the path of the original subterranean river that flowed through this giant canyon passage took a hard turn to the right (when viewed in the downstream direction) - about 115 degrees. The projecting wall itself forms an approximately 20 degree angle (= acute). This picture is looking upstream - the passage continues to the left on the far side of the projecting wall. The rubble in the foreground is breakdown. Locality: Acute Angle, between Giant's Coffin and Star Chamber, Main Cave, Mammoth Cave Ridge, Mammoth Cave National Park, western Kentucky, USA |
Date | |
Source | Acute Angle (Main Cave, Mammoth Cave, Kentucky, USA) 1 |
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@N05/38202307382 (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. |
13 October 2019
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current | 17:40, 13 October 2019 | ![]() | 4,000 × 3,000 (8.73 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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ISO speed rating | 400 |
Date and time of data generation | 20:48, 13 June 2011 |
Lens focal length | 6.2 mm |
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Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 01:28, 7 November 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 20:48, 13 June 2011 |
Meaning of each component |
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File source | Digital still camera |
Custom image processing | Normal process |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Date metadata was last modified | 20:28, 6 November 2017 |
Unique ID of original document | uuid:6B37763A0A8D11E285FB874ED02A7EA7 |
Copyright status | Copyright status not set |
IIM version | 2 |