Metagraywackes (Chelmsford Formation, Paleoproterozoic, 1.74 Ga; Larchwood North outcrop, Sudbury Impact Structure, Ontario, Canada) 36

            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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Taken on: July 15, 2012

Tags:

Chelmsford

Formation

Group

Precambrian

Proterozoic

Paleoproterozoic

Larchwood

Ontario

Canada

Sudbury

Basin

graywacke

greywacke

graywackes

greywackes

metagraywacke

metagreywackes

sandstone

sandstones

turbidite

turbidites « less

Sets appears in: • Ontario Rocks, Minerals, Geology • Chelmsford Formation (Paleoproterozoic, 1.74 Ga; Sudbury Impact Structure, Ontario, Canada) more » • Paleoproterozoic Rocks & Fossils « less

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