File:Potholes (Presque Isle River, Porcupine Mountains State Park, Upper Peninsula of Michigan, USA) (21466113862).jpg
![File:Potholes (Presque Isle River, Porcupine Mountains State Park, Upper Peninsula of Michigan, USA) (21466113862).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a8/Potholes_%28Presque_Isle_River%2C_Porcupine_Mountains_State_Park%2C_Upper_Peninsula_of_Michigan%2C_USA%29_%2821466113862%29.jpg/800px-Potholes_%28Presque_Isle_River%2C_Porcupine_Mountains_State_Park%2C_Upper_Peninsula_of_Michigan%2C_USA%29_%2821466113862%29.jpg?20200128021146)
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[edit]DescriptionPotholes (Presque Isle River, Porcupine Mountains State Park, Upper Peninsula of Michigan, USA) (21466113862).jpg |
The rounded pits are potholes - some of the best I've ever seen. Potholes principally form by abrasive erosion by sediments (sand & gravel) moving in eddies within pre-existing bedrock depressions. The rocks are dark-colored mudshales of the Precambrian-aged Nonesuch Shale. Stratigraphy: Nonesuch Shale, middle Oronto Group, upper Keweenawan Supergroup, upper Mesoproterozoic Locality: lower Presque Isle River, Porcupine Mountains State Park, Upper Peninsula of Michigan, USA |
Date | |
Source | Potholes (Presque Isle River, Porcupine Mountains State Park, Upper Peninsula of Michigan, USA) |
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@N05/21466113862 (archive). It was reviewed on 28 January 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
28 January 2020
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current | 02:11, 28 January 2020 | ![]() | 1,280 × 960 (1.11 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | OLYMPUS OPTICAL CO.,LTD |
Camera model | C900Z,D400Z |
Exposure time | 1/68 sec (0.014705882352941) |
F-number | f/3.9 |
ISO speed rating | 200 |
Date and time of data generation | 03:52, 30 August 2003 |
Lens focal length | 10.5 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 18:59, 16 September 2015 |
Y and C positioning | Co-sited |
Exif version | 2.1 |
Date and time of digitizing | 03:52, 30 August 2003 |
Meaning of each component |
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Image compression mode | 2 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Supported Flashpix version | 1 |
Image width | 1,280 px |
Image height | 960 px |
Date metadata was last modified | 14:59, 16 September 2015 |
IIM version | 2 |