Stratigraphy of Petrified Forest National Park

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Generalized stratigraphy of the Petrified Forest National Park and vicinity compiled after:

Martz, J. W. and Parker W. G., 2010, Revised Lithostratigraphy of the Sonsela Member (Chinle Formation, Upper Triassic) in the Southern Part of Petrified Forest National Park, Arizona. PLoS ONE 5(2): e9329. doi:10.1371/journal.pone.0009329.

Woody, D. T., 2006, Revised stratigraphy of the lower Chinle Formation (Upper Triassic) of Petrified Forest National Park, Arizona: in A Century of Research at Petrified Forest National Park: Geology and Paleontology: Parker, W. G., Ash, S. R., and Irmis, R. B., editors, Flagstaff, Arizona: Museum of Northern Arizona Bulletin no. 62, p. 17-45.

With addition stratigraphic unit information from the park area modified from Billingsley, G. H., 1985, General stratigraphy of Petrified Forest National Park: Museum of Northern Arizona Bulletin, v. 54, p. 3-8; and Ash, S. R., 1987, Petrified Forest National Park, Arizona: in Rocky Mountain Section of the Geological Society of America, Beus, S. S., editor, Boulder, Colorado: Geological Society of America Centennial Field Guide v. 2, p. 405-410.
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Fossil logs at Petrified Forest National Park. Click here to begin a geologic image tour of Petrified Forest National Park.

To learn more about Petrified Forest National Park check out the National Park Service website at:

Stratigraphic unit information is modified from the USGS GeoLex (Lexicon of Geology):

Information about the Geologic Time Scale is available at:

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Last modified: 1/10/2011
Quaternary sediments Bidahochi Owl Rock Petrified Forest Chinle Shinarump Moenkopi Blue Mesa Member Sonsela Member