Petrified Forest National Park Stratigraphy

Stratigraphy of Petrified Forest National Park

Click on any stratigraphic name for more information.

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.

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: http://www.nps.gov/pefo/.

Stratigraphic unit information is modified from the USGS GeoLex (Lexicon of Geology): http://ngmdb.usgs.gov/Geolex/geolex_qs.html.

Information about the Geologic Time Scale is available at: https://gotbooks.miracosta.edu/gonp/coloradoplateau/timescale.htm.