File:Proglacial lacustrine argillite with dropstone (Konnarock Formation, Neoproterozoic, ~750 Ma; roadcut at Rt. 58-Rt. 755 intersection, west of Konnarock, Virginia, USA) 2 (31040804106).jpg
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DescriptionProglacial lacustrine argillite with dropstone (Konnarock Formation, Neoproterozoic, ~750 Ma; roadcut at Rt. 58-Rt. 755 intersection, west of Konnarock, Virginia, USA) 2 (31040804106).jpg |
Proglacial lacustrine argillite with dropstone from the Precambrian of Virginia, USA. The Snowball Earth Glaciations during the Neoproterozoic were the most significant ice ages that Earth ever experienced - two or three of them occurred in succession. The most extreme models describing Snowball Earth have glacial ice completely covering all continents and all oceans, even at the equator. Some models, called “Slushball Earth”, have Earth’s equatorial oceanic areas not completely frozen over. Each Snowball Earth Glaciation was followed by a super-greenhouse climate. The resulting sedimentary record of these “freeze-fry” events typically consists of glacial tillites and overlying cap carbonates. These units are preserved at many localities on Earth. Shown above is argillite with a granite dropstone near the right edge of the sample. Dropstones are formed when glaciers over bodies of water melt and release their ice-entrained sediment grains. Larger dropstones that fell into fine-grained sediments (= mud, as in the case here) deform the underlying layers and often have arched, draping sediment layers above. The granite is derived from the 1.0 to 1.3 billion year old Cranberry Gneiss. Stratigraphy: Konnarock Formation, Neoproterozoic, ~750 Ma Locality: roadcut on the eastern side of Rt. 58, on the southern side of the Rt. 58-Rt. 755 intersection, west of the town of Konnarock, southeastern Washington County, southwestern Virginia, USA (= stop 3A of Merschat et al., 2014, Geological Society of America Field Guide 35: 63-101.) (36º 39' 36.00" North latitude, 81º 39' 11.63" West longitude) |
Date | |
Source | Proglacial lacustrine argillite with dropstone (Konnarock Formation, Neoproterozoic, ~750 Ma; roadcut at Rt. 58-Rt. 755 intersection, west of Konnarock, Virginia, 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@N05/31040804106. It was reviewed on 24 June 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
24 June 2017
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current | 17:55, 24 June 2017 | 4,000 × 2,695 (7.73 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 | 1/1,000 sec (0.001) |
F-number | f/3.5 |
ISO speed rating | 80 |
Date and time of data generation | 10:32, 15 October 2016 |
Lens focal length | 9.7 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 10:32, 15 October 2016 |
Y and C positioning | Centered |
Exif version | 2.21 |
Date and time of digitizing | 10:32, 15 October 2016 |
Meaning of each component |
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APEX shutter speed | 9.9686668031948 |
APEX aperture | 3.614709851552 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 3.614709851552 APEX (f/3.5) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905405405 |
Focal plane Y resolution | 16,483.516483516 |
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 | Portrait |