File:Grand Canyon National Park- Toroweap Formation.jpg

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Description

A detail of the mixture of stones that make up the Toroweap Formation. NPS Photo by: Kristen M. Caldon

Toroweap Formation: thickness: 130-375 ft.

The Toroweap Formation, a mixture of shales, sandstones, and limestones, forms the first slope below the rim of the canyon.

It was deposited 273 million years ago, during the Paleozoic Era- Late Early Permian Period. This formation, with its variable rocks, marks the return of the sea to the Grand Canyon region. Both transgressions and regressions occurred during deposition.

The Toroweap Formation was thus deposited in everything from shallow marine and intertidal to coastal dune environments.
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Source Flickr: Grand Canyon National Park- Toroweap Formation_0936
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Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.

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current21:14, 1 January 2013Thumbnail for version as of 21:14, 1 January 20133,872 × 2,592 (1.85 MB)Flickr upload botUploaded from http://flickr.com/photo/50693818@N08/7706886684 using Flickr upload bot
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