Image: Grand Canyon National Park- Toroweap Formation

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.
Title: Grand Canyon National Park- Toroweap Formation
Credit: Flickr: Grand Canyon National Park- Toroweap Formation_0936
Author: Public Domain
Permission: This image, which was originally posted to Flickr, was uploaded to Commons using Flickr upload bot on 1 January 2013, 21:13 by Tillman. On that date, it was confirmed to be licensed under the terms of the license indicated. This file is licensed under the Creative Commons Attribution 2.0 Generic license. You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. https://creativecommons.org/licenses/by/2.0 CC BY 2.0 Creative Commons Attribution 2.0 truetrue
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