File:Snow roller (30 January 2014) (Newark, Ohio, USA) 38 (31891160787).jpg
![File:Snow roller (30 January 2014) (Newark, Ohio, USA) 38 (31891160787).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/8c/Snow_roller_%2830_January_2014%29_%28Newark%2C_Ohio%2C_USA%29_38_%2831891160787%29.jpg/800px-Snow_roller_%2830_January_2014%29_%28Newark%2C_Ohio%2C_USA%29_38_%2831891160787%29.jpg?20191128210435)
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Summary
[edit]DescriptionSnow roller (30 January 2014) (Newark, Ohio, USA) 38 (31891160787).jpg |
(photo by Mary Ellen St. John) Snow rollers are very rare sedimentary structures. They only form in snowy sediments. Snow is a type of sediment of cold, meteoric origin and composed of the mineral ice (H2O). Snow rollers are layered cylindrical structures formed as moderately strong winds blow across snow surfaces. They are rare because several specific conditions must be met (e.g., see Reed, 1933; Cameron, 1949; Hornstein, 1951). Depressed trails occur behind snow rollers, showing the direction of movement. Trails start out small and narrow, but widen toward the actual snow roller. The widening trail reflects the growth of the snow roller - each end of the cylinder is conically embayed. The example seen here formed in late January 2014 in Ohio. This is semi-natural, because the field in which it occurs was clear-cut long ago. Almost all of Ohio's natural landscape was originally forested. Locality: field along the northern side of Sharon Valley Road, west of Country Club Drive intersection, western side of Newark, Licking County, east-central Ohio, USA References cited: Cameron (1949) - Snow rollers - nature at play. Weatherwise February, 1949: 12-13. Hornstein (1951) - Snow rollers. Weather 6(6); 168-169. Reed (1933) - Snow rollers. Monthly Weather Review December, 1932: 252. |
Date | |
Source | Snow roller (30 January 2014) (Newark, Ohio, USA) 38 |
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@N05/31891160787. It was reviewed on 28 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
28 November 2019
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current | 21:04, 28 November 2019 | ![]() | 1,396 × 881 (641 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Exposure time | 1/1,250 sec (0.0008) |
F-number | f/6.3 |
ISO speed rating | 100 |
Date and time of data generation | 01:48, 30 January 2014 |
Lens focal length | 4.3 mm |
Width | 1,396 px |
Height | 1,057 px |
Bits per component |
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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 | 17:41, 21 January 2019 |
Y and C positioning | Co-sited |
Exif version | 2.3 |
Date and time of digitizing | 01:48, 30 January 2014 |
Meaning of each component |
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APEX shutter speed | 10.28125 |
APEX aperture | 5.3125 |
APEX exposure bias | 0 |
Maximum land aperture | 2.875 APEX (f/2.71) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
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Color space | sRGB |
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File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 4.3-150.5 mm |
Rating (out of 5) | 0 |
Date metadata was last modified | 12:41, 21 January 2019 |
Unique ID of original document | CA14A8A1A18DDF71AE31BF9A40BF342C |
IIM version | 1 |