File:Banded iron-formation over basement rocks (Archean; Route 17 roadcut east of Bridget Lake, south of Wawa, Ontario, Canada) 36 (48270299621).jpg

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Iron-formation over basement rocks in the Precambrian of Ontario, Canada.

This is a cross-section exposure of Archean-aged, structurally folded, banded iron formation (BIF) perched atop basement rocks. I'm not absolutely sure about the formal stratigraphic name of the unit at this site, but it appears to be the Michipicoten Iron-Formation (Neoarchean, 2.696 to 2.749 billion years old). The basement rocks below the BIFs are part of the Bridget Lake Stock, which consists of “quartz feldspar porphyry”.

Locality: Route 17 roadcut, just west of Antoine Lake, southeast of Bridget Lake, south-southwest of the town of Wawa, Michipicoten Greenstone Belt, Ontario, southeastern Canada (47° 53’ 44.36” North latitude, 84° 50’ 47.95” West longitude)
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Source Banded iron-formation over basement rocks (Archean; Route 17 roadcut east of Bridget Lake, south of Wawa, Ontario, Canada) 36
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@N05/48270299621 (archive). It was reviewed on 5 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

5 December 2019

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current05:56, 5 December 2019Thumbnail for version as of 05:56, 5 December 20194,000 × 3,000 (8.27 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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