File:Plumose marking on joint surface in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 2 (23733446026).jpg
![File:Plumose marking on joint surface in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 2 (23733446026).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Plumose_marking_on_joint_surface_in_tholeiitic_basalt_%28Clam_Falls_Volcanics%2C_Mesoproterozoic%2C_~1.1_Ga%3B_Interstate_State_Park%2C_Taylors_Falls%2C_Minnesota%2C_USA%29_2_%2823733446026%29.jpg/800px-thumbnail.jpg?20191010002205)
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[edit]DescriptionPlumose marking on joint surface in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 2 (23733446026).jpg |
Joints are fractures in rocks along which no differential displacement has occurred. This distinguishes them from faults, along which displacement has taken place. Some joint surfaces have feathery-like features called plumose markings. They consist of an axis and small-scale, radiating-outward ridges. The divergent-direction axis points toward the direction of fracture propagation. Host rocks: tholeiitic basalt, Clam Falls Volcanics, upper Mesoproteozoic, ~1.1 Ga Locality: outcrops above the western banks of the St. Croix River, Interstate State Park, Taylors Falls, eastern Chisago County, eastern Minnesota, USA |
Date | |
Source | Plumose marking on joint surface in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 2 |
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@N05/23733446026 (archive). It was reviewed on 10 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
10 October 2019
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current | 00:22, 10 October 2019 | ![]() | 4,000 × 3,000 (5.82 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/160 sec (0.00625) |
F-number | f/3.2 |
ISO speed rating | 80 |
Date and time of data generation | 10:51, 5 June 2015 |
Lens focal length | 7.23 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
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Pixel composition | RGB |
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 | 23:22, 14 December 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 10:51, 5 June 2015 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 7.3125 |
APEX aperture | 3.34375 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
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Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Landscape |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 16:22, 14 December 2015 |
Unique ID of original document | ECCC09FDF0CAA8F542739B1B520B42FF |