File:Tillite (Konnarock Formation, Neoproterozoic, 650-700 Ma (?); Fox Creek roadcut, Grayson County, Virginia, USA) 1 (25807324030).jpg
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| Description |
Tillite from the Precambrian of Virginia, USA. (~4.8 cm across at its widest) The Snowball Earth Glaciation during the Neoproterozoic was the most significant Ice Age that Earth ever encountered. The most extreme model describing Snowball Earth has 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. The Snowball Earth Glaciation was apparently 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 rock shown above is a glacial conglomerate deposited by Snowball Earth glaciers. Glacial conglomerates are called tillites, which are ancient lithified tills. Tills are coarse-grained, poorly-sorted, poorly-bedded to non-bedded glacial deposits. The large whitish-gray pebble at left is composed of quartz. The pinkish-orangish material in some of the other clasts are potassium feldspar. Stratigraphy: Konnarock Formation, Neoproterozoic, 650 to 700 Ma (?) Locality: Fox Creek Outcrop - roadcut on the southern side of Rt. 602, across the road from Fox Creek, northwestern Grayson County, western Virginia, USA (36º 41.773’ North latitude, 81º 28.088’ West longitude) |
| Date | |
| Source | Tillite (Konnarock Formation, Neoproterozoic, 650-700 Ma (?); Fox Creek roadcut, Grayson County, Virginia, USA) 1 |
| 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@N05/25807324030 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 02:12, 6 December 2019 | | 2,757 × 2,086 (3.57 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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