This website is a guide to rock formations exposed in selected National
Parks and other federal lands on the Colorado Plateau.
Linked web pages with
generalized stratigraphic sections are intended as reference for selected
park websites included in the "3D Geology of National Parks"
The 3D Geology of National Parks website contains photographic tours of
selected park areas in both 3D-images and standard photographs (both modern
and historic imagery).
Information about the Geologic Time Scale is available here.
For a general summary of the geology of the Colorado Plateau, see a summary by Annabelle Foos (1999) on the NPS website: http://www.nature.nps.gov/geology/education/foos/plateau.pdf
Important information about this website:
Subsurface geologic information is not included on individual stratigraphic
sections, but can be inferred from surrounding areas (such as in the Grand
Canyon and Flaming Gorge areas where the Colorado and Green rivers carved
canyons that exposed ancient bedrock). Stratigraphic sections show the
relative thickness and age of named geologic units. Each of the named
units on each stratigraphic sections is hot-linked to information derived
(and revised) from the USGS GeoLex (Lexicon of Geology): http://ngmdb.usgs.gov/Geolex/ - and from other sources. Lexicon data provide a snapshot of the age
and extent of rock units, plus reference sources that provide insight
into the historic exploration, discovery, and ongoing research into Earth
history and natural resources associated with each unit. Note that possibly many other stratigraphic names may exist in the literature that may not appear in the Geolex Database or within this website. Also note that the USGS and other geologic agencies try to use uniform usage of unit names, but not all terminology is uniformly used or currently accepted by every organization. Each of the stratigraphic sections (and linked named units) use terminology from the most recently published stratigraphic sections based of references listed on individual pages, most of which were initially compiled in 2004. More recent reviews, discoveries, or changes in stratigraphic nomenclature may exist in the literature.
For more source information about regional stratigraphy that may not appear on this website see Stamm, N. and Soller, D., , Geolex Database [a subset of the National Geologic Map Database]: Reston, Virginia: U.S. Geological Survey. Available online at http://ngmdb.usgs.gov.