File:Quartzose sandstones (Jordan Sandstone, Upper Cambrian; roadcut on the northern side of Stillwater, Minnesota, USA) 1 (18354728053).jpg

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Quartzose sandstones in the Cambrian of Minnesota, USA.

Outcrops of the Jordan Sandstone occur in eastern & southeastern Minnesota; northeastern Iowa; and in western, southern, and eastern Wisconsin. The Jordan Sandstone represents an ancient shallow marine siliciclastic succession deposited on the eastern, southern, and western sides of the Wisconsin Dome (see map in Tape et al., 2003). Sedimentary structures present in Jordan Sandstone outcrops indicate that quartz sand deposition occurred in the ocean from below fair-weather wave base up to beach facies and even in subaerial back-beach dune facies.

Stratigraphy: Jordan Sandstone, Sunwaptan Stage, Upper Cambrian, ~491-493 Ma

Locality: Stillwater Railway Depot Outcrop - roadcuts on the northern and southern sides of Elm Street, just west of Rt. 95, due west of an old railroad depot, northern side of the town of Stillwater, Minnesota, USA (45° 03' 47.60" North, 92° 48' 25.54" West)

Reference cited:

Tape et al. (2003) - Tidal-bundle sequences in the Jordan Sandstone (Upper Cambrian), southeastern Minnesota, U.S.A.: evidence for tides along inboard shorelines of the Sauk epicontinental sea. Journal of Sedimentary Research 73: 354-366.
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Source Quartzose sandstones (Jordan Sandstone, Upper Cambrian; roadcut on the northern side of Stillwater, Minnesota, USA) 1
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://flickr.com/photos/47445767@N05/18354728053. 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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