File:Quartzose sandstones (Mazomanie Formation, Upper Cambrian; riverside cliff, western side of the St. Croix River, northeast of Lookout Point, Minnesota, USA) 4 (18811819890).jpg

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Quartzose sandstones in the Cambrian of Minnesota, USA.

This cliff exposure consists of quartzose sandstones of the Mazomanie Formation, a shallow marine siliciclastic succession in the Upper Cambrian of the Upper Mississippi Valley, USA. Herringbone cross-bedding and trough cross-bedding are moderately common here. Skolithos trace fossils and intraclastic sandstone horizons are also present.

Stratigraphy: Mazomanie Formation, upper Tunnel City Group (formerly the Franconia Sandstone), Sunwaptan Stage, Upper Cambrian, ~491-493 Ma

Locality: riverside cliff exposures along the western side of St. Croix River, below a rest stop along Rt. 95 between mileposts 101 and 102, just northeast of Lookout Point, north-northeast of the town of Stillwater, Minnesota, USA (45° 05’ 03.80" North, 92° 47’ 10.33" West)
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Source Quartzose sandstones (Mazomanie Formation, Upper Cambrian; riverside cliff, western side of the St. Croix River, northeast of Lookout Point, Minnesota, USA) 4
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://flickr.com/photos/47445767@N05/18811819890. It was reviewed on 19 July 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

19 July 2015

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current19:56, 19 July 2015Thumbnail for version as of 19:56, 19 July 20153,000 × 4,000 (3.63 MB)Natuur12 (talk | contribs)Transferred from Flickr via Flickr2Commons

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