File:Metatillite (diamictite) (Gowganda Formation, Paleoproterozoic, ~2.3 Ga; Route 6 outcrop, north of Manitoulin Island, Ontario, Canada) 4.jpg

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English: Metatillite from the Precambrian of Ontario, Canada.

Tillites are ancient, lithified tills (= unsorted, nonbedded, coarse-grained glacial deposits). This sample is from 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.

Gowganda tillites have been somewhat metamorphosed, so a proper lithologic term is metatillite. Most of the included clasts are granitic.

Stratigraphy: Gowganda Formation, lower Cobalt Group, Huronian Supergroup, Paleoproterozoic, ~2.3 Ga

Locality: exposures beside Route 6, 1 to 2 miles south of Whitefish Falls & ~4 miles north of Roosevelt Memorial, just north of Manitoulin Island, southern Ontario, Canada
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Source https://www.flickr.com/photos/47445767@N05/51142138794/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/51142138794. It was reviewed on 6 May 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 May 2021

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current19:22, 6 May 2021Thumbnail for version as of 19:22, 6 May 20212,477 × 2,907 (5.37 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51142138794/ with UploadWizard

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