File:Diamictite (metatillite) (Konnarock Formation, Neoproterozoic, ~750 Ma; Rt. 603 roadcut near Konnarock, Virginia, USA) 49 (25337206839).jpg
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Summary
DescriptionDiamictite (metatillite) (Konnarock Formation, Neoproterozoic, ~750 Ma; Rt. 603 roadcut near Konnarock, Virginia, USA) 49 (25337206839).jpg |
Diamictite in 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. The Virginia outcrop shown above consists of a Snowball Earth glacial conglomerate (polylithic diamictite), with non-bedded matrix-supported clasts. This was originally a glacial till. With burial and lithification, till becomes tillite. The rocks in this area have been subjected to very low grade metamorphism, so the tillite is now a metatillite. The clasts vary in lithology, origin, and age. The most conspicuous clasts are speckled granites (dominated by quartz and potassium feldspar), derived from the 1.0 to 1.3 billion year old Cranberry Gneiss. Stratigraphy: Konnarock Formation, Neoproterozoic, ~750 Ma Locality: roadcut on the northern side of Rt. 603, immediately west of the Rt. 603- Rt. 755 intersection, just west of the town of Konnarock, southeastern Washington County, southwestern Virginia, USA (36º 39' 49.34" North latitude, 81º 38' 45.54" West longitude) |
Date | |
Source | Diamictite (metatillite) (Konnarock Formation, Neoproterozoic, ~750 Ma; Rt. 603 roadcut near Konnarock, Virginia, USA) 49 |
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@N05/25337206839. 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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15 October 2016
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14.303 millimetre
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current | 17:49, 24 June 2017 | 4,000 × 3,000 (4.35 MB) | Ser Amantio di Nicolao | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/500 sec (0.002) |
F-number | f/4.5 |
ISO speed rating | 80 |
Date and time of data generation | 09:01, 15 October 2016 |
Lens focal length | 14.303 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 09:01, 15 October 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 09:01, 15 October 2016 |
Meaning of each component |
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Shutter speed | 8.96875 |
APEX aperture | 4.34375 |
Exposure bias | −0.33333333333333 |
Maximum land aperture | 4.34375 APEX (f/4.51) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
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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 |