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Ancient Passive Margin—Grand Canyon Supergroup

illustration upper layers of the earth showing the ancient depositional setting of colorado plateau region sedimentary rocks

The region included the coastal plain as well as shallow water of the continental shelf. Rift valley strata from an earlier breakup of the continent are called the Grand Canyon Supergroup, whereas the igneous and metamorphic rocks of the inner portions of Grand Canyon are part of the underlying, older continental crust.

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Modified from “Parks and Plates: The Geology of our National Parks, Monuments and Seashores,” by Robert J. Lillie, New York, W. W. Norton and Company, 298 pp., 2005, www.amazon.com/dp/0134905172.

Public domain:Full Granting Rights

Image

Geologic Resources Division, Code: GRD

NPS.gov Collection

12/05/2019

12/05/2019

Public Can View

Friday, January 31, 2020 12:57:57 PM

Friday, January 31, 2020 12:57:57 PM

illustration upper layers of the earth colorado plateau region@10x.jpg

Thursday, December 5, 2019 3:31:41 PM

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474.2 kB

2019-12-05T08:31:41-07:00

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