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Original file (3,000 × 4,000 pixels, file size: 8.31 MB, MIME type: image/jpeg)
Summary
| Description |
Tillite in the Precambrian of Ontario, Canada. Tillites are ancient, lithified tills (= unsorted, nonbedded, coarse-grained glacial deposits). This is part of the famous Gowganda Formation, a ~2.3 billion year old deposit in Ontario, Canada representing a very ancient Ice Age. Other glacially-deposited sedimentary rocks of Paleoproterozoic age have been reported from Wyoming, Finland, India, southern Africa, and Australia. The glaciation was likely a widespread event, and may have persisted for a long time. This ice age is hypothesized to have been triggered by decreasing levels of methane gas (CH4) in the atmosphere as oxygen gas (O2) levels increased (the methane oxidized to carbon dioxide). This lessened the effects of greenhouse warming, and resulted in climate cooling. Notice that the till clast has been faulted - its odd shape is a result of offset along a fracture. Stratigraphy: Coleman Member, Gowganda Formation, lower Cobalt Group, Huronian Supergroup, Paleoproterozoic, ~2.3 Ga Locality: Straight Lake West outcrop - roadcut on the western side of Route 11, due west of Straight Lake, ~0.4 miles south of the Route 11-Roosevelt Forest Road/Anima Nipissing Road intersection & ~2.1 miles south of the town of Latchford & north of the town of Temagami, Ontario, southeastern Canada (47° 17’ 32.79” North latitude, 79° 47’ 29.17” West longitude) |
| Date | |
| Source | Faulted clast in tillite (Coleman Member, Gowganda Formation, Paleoproterozoic, ~2.3 Ga; Straight Lake West roadcut, north of Temagami, Ontario, Canada) 3 |
| 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@N05/47026270824 (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. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:50, 6 December 2019 | | 3,000 × 4,000 (8.31 MB) | wikimediacommons>Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
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