File:Stromatolitic metadolostone (Kona Dolomite, Paleoproterozoic, 2.2 to 2.3 Ga; Lindberg Quarry, Marquette, Upper Peninsula of Michigan, USA) (8363769094).jpg

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Stromatolitic metadolostone - nice stromatolite from the Kona Dolomite (Precambrian) of northern Michigan, USA.

Stratigraphy: Kona Dolomite, Chocolay Group, lower Marquette Range Supergroup, Paleoproterozoic, 2.2 to 2.3 Ga.

Locality: Lindberg Quarry, Marquette, northern Upper Peninsula of Michigan, USA.

Stromatolites are large, layered structures built up by mats of cyanobacteria. Stromatolites vary in appearance, ranging from slightly wrinkled horizontal laminations in sedimentary rocks to low mounds to prominent mounds to columnar structures and other forms.

Stromatolites are most common in the Proterozoic fossil record. They are scarce today, but famous modern examples occur at Shark Bay, Western Australia.
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Source Stromatolitic metadolostone (Kona Dolomite, Paleoproterozoic, 2.2 to 2.3 Ga; Lindberg Quarry, Marquette, Upper Peninsula of Michigan, USA)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/8363769094. It was reviewed on 3 March 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

3 March 2015

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