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File:Bluegreen-shale-335x-scalebar.jpg

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Captions

Blue-green shale from the Cretaceous period Coleraine formation in Minnesota.

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Description
English: Blue-green shale from the Coleraine formation is a fine mixture of hematite and limonite in a greenish iron-clay matrix. The Coleraine formation is a Cretaceous period geological formation in Minnesota that contains sediments and fossils from the Western Interior Seaway approximately 90 million years ago. This layer was exposed by iron mining on the Mesabi Iron Range. This rock was found in Hill Annex Mine State Park in Calumet, MN. The image was taken with a ZEISS Smartzoom 5 microscope at 335X magnification using extended depth of field.
Date
Source Own work
Author Rylan Bachman
Camera location47° 19′ 16″ N, 93° 16′ 28″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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current22:25, 6 December 2019Thumbnail for version as of 22:25, 6 December 20191,600 × 1,300 (1.14 MB)Wi-kiry-lan (talk | contribs)User created page with UploadWizard

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