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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.
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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
249:– You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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Slate (Knife Lake
Formation, metamorphism at 2.7 Ga, Neoarchean; Rt. 135 roadcut, Gilbert, Minnesota, USA) 3 (23140002749).jpg
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This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
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Slate (Knife Lake
Formation, metamorphism at 2.7 Ga, Neoarchean; Rt. 135 roadcut, Gilbert, Minnesota, USA) 3
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The following pages on the
English Knowledge (XXG) use this file (pages on other projects are not listed):
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Stratigraphy: Knife Lake
Formation, metamorphism at 2.7 Ga (Neoarchean)
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and was confirmed to be licensed under the terms of the cc-by-2.0.
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Add a one-line explanation of what this file represents
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https://www.flickr.com/photos/jsjgeology/23140002749/
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Commons is a freely licensed media file repository.
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147:Slate in the Precambrian of Minnesota, USA.
1015:Transferred from Flickr via #flickr2commons
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
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