File:Slate (Knife Lake Formation, metamorphism at 2.7 Ga, Neoarchean; Rt. 135 roadcut, Gilbert, Minnesota, USA) 3 (23140002749).jpg

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Description

Slate in the Precambrian of Minnesota, USA.

This is an outcrop of slate, a foliated metamorphic rock composed of clay minerals. Slate is the product of low-grade metamorphism of shale. The original shale bedding is visible in slate samples at this locality. The planar surfaces facing the viewer in the above photo are foliation planes.

Stratigraphy: Knife Lake Formation, metamorphism at 2.7 Ga (Neoarchean)

Locality: roadcut on the southern side of Rt. 135 at the Gilbert city limits sign, just west of the town of Gilbert & southeast of the town of Virginia, central St. Louis County, northeastern Minnesota, USA (47° 29' 33.57" North latitude, 92° 29' 24.79" West longitude)
Date
Source Slate (Knife Lake Formation, metamorphism at 2.7 Ga, Neoarchean; Rt. 135 roadcut, Gilbert, Minnesota, USA) 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@N05/23140002749 (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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current23:52, 4 December 2019Thumbnail for version as of 23:52, 4 December 20194,000 × 3,000 (4.05 MB)imagescommonswiki>Ser Amantio di NicolaoTransferred from Flickr via #flickr2commons

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