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File:Carbonaceous siltstone (Nonesuch Formation, Precambrian; Keweenaw Peninsula, Upper Peninsula of Michigan, USA).jpg

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English: Siltstone from the Precambrian of Michigan, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)

This rock is from the Nonesuch Formation, a 1.07 to 1.08 billion years old mixed siliciclastics unit in northern Michigan. In places, for example the White Pine Mine, the Nonesuch Formation has been partially mineralized with native copper. Copper can occur as fracture fillings or as scattered, small, intergranular masses or can partially replace bulk rocks.

Stratigraphy: Nonesuch Formation, middle Oronto Group, upper Keweenawan Supergroup, upper Mesoproterozoic, ~1.07 to 1.08 Ga

Locality: unrecorded/undisclosed site in the Keweenaw Peninsula, Upper Peninsula of Michigan, USA
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Source https://www.flickr.com/photos/47445767@N05/26826662057/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/26826662057. It was reviewed on 26 March 2024 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

26 March 2024

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current16:53, 26 March 2024Thumbnail for version as of 16:53, 26 March 20242,055 × 2,436 (4.16 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/26826662057/ with UploadWizard

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