File:Metagraywackes (Chelmsford Formation, Paleoproterozoic, 1.74 Ga; Larchwood North outcrop, Sudbury Impact Structure, Ontario, Canada) 20 (32817627707).jpg

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Metagraywackes in the Precambrian of Ontario, Canada.

These rocks have been interpreted to be part of a proximal turbidite succession. This unit occurs only within the Sudbury Basin. A relatively large muscovite mica grain was found in a sample here - the rocks are definitely immature sandstones.

Stratigraphy: Chelmsford Formation, upper Whitewater Group, upper Paleoproterozoic, 1.74 Ga

Locality: Larchwood North outcrop, eastern side of Rt. 144, immediately south of narrow side road on the northern end of a railroad overpass, just north of the town of Larchwood, Sudbury Impact Structure, Ontario, southeastern Canada (46° 34’ 30.03” North latitude, 81° 17’ 19.86” West longitude) (= stop 20 of Rousell et al. (2009) - A field guide to the geology of Sudbury, Ontario. Ontario Geological Survey Open File Report 6243, p. 154.)
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Source Metagraywackes (Chelmsford Formation, Paleoproterozoic, 1.74 Ga; Larchwood North outcrop, Sudbury Impact Structure, Ontario, Canada) 20
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@N05/32817627707 (archive). It was reviewed on 22 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

22 October 2019

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current06:11, 22 October 2019Thumbnail for version as of 06:11, 22 October 20193,000 × 3,371 (7.49 MB)Rudolphous (talk | contribs)Transferred from Flickr via #flickr2commons

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