File:22-15-018-marker.jpg
Original file (2,098 × 3,072 pixels, file size: 2.29 MB, MIME type: image/jpeg)
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Summary
[edit]Description22-15-018-marker.jpg |
English:
Mississippi River Overlook This particular bluff, from here to the bottom of the hill, contains the most complete exposure of the Galena Group rocks known. This widespread rock sequence is named for outcrops at Galena, Illinois, and the term “galena” refers to the lead ore which has been mined from this district for at least the last 300 years. These carbonate rocks are also characterized by numerous vertical and horizontal fractures and crevices. Through geologic time some of these openings were slowly enlarged by seeping groundwater. The result is the development of sinkholes at the land surface, underground caverns, and springs along steep valley sides throughout this region. The flow of moist cool air down through these subterranean passageways and out over the valley slopes provides isolated, rare habitats for unusual assemblages of plants normally found in more northern climates. In addition to the valley’s offerings in earth history and ecological adaptations, this natural corridor was an important route of both prehistoric and historic exploration, trade, settlement, and transportation. |
Date | |
Source | Self-photographed |
Author | Dsdugan |
Other versions |
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Camera location | 42° 44′ 51.11″ N, 91° 05′ 22.09″ W | View this and other nearby images on: OpenStreetMap | 42.747530; -91.089470 |
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Licensing
[edit]This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. | |
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:36, 1 September 2022 | 2,098 × 3,072 (2.29 MB) | Dsdugan (talk | contribs) | Uploaded own work with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera model | Nikon D5300 |
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F-number | f/9.5 |
ISO speed rating | 100 |
Date and time of data generation | 20:21, 7 August 2022 |
Lens focal length | 38 mm |
Software used | GraphicConverter 10 (10.7.5) |
File change date and time | 10:08, 1 September 2022 |
Color space | sRGB |
Height | 5,759 px |
Width | 3,830 px |
Unique ID of original document | xmp.did:992c8bcb-4854-4b15-b213-009c1ee44e3b |