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- Geology_of_the_Grand_Canyon_area abstract "The geology of the Grand Canyon area includes one of the most complete and studied sequences of rock on Earth. The nearly 40 major sedimentary rock layers exposed in the Grand Canyon and in the Grand Canyon National Park area range in age from about 200 million to nearly 2 billion years old. Most were deposited in warm, shallow seas and near ancient, long-gone sea shores in western North America. Both marine and terrestrial sediments are represented, including fossilized sand dunes from an extinct desert. There are at least 14 known unconformities in the geologic record found in the Grand Canyon area.Uplift of the region started about 75 million years ago during the Laramide orogeny; a mountain-building event that is largely responsible for creating the Rocky Mountains to the east. In total, the Colorado Plateau was uplifted an estimated 2 miles (3.2 km). The adjacent Basin and Range province to the west started to form about 18 million years ago as the result of crustal stretching. A drainage system that flowed through what is today the eastern Grand Canyon emptied into the now lower Basin and Range province. Opening of the Gulf of California around 6 million years ago enabled a large river to cut its way northeast from the gulf. The new river captured the older drainage to form the ancestral Colorado River, which in turn started to form the Grand Canyon.Wetter climates brought upon by ice ages starting 2 million years ago greatly increased excavation of the Grand Canyon, which was nearly as deep as it is now by 1.2 million years ago. Volcanic activity deposited lava over the area 1.8 million to 500,000 years ago. At least 13 lava dams blocked the Colorado River, forming lakes that were up to 2,000 feet (610 m) deep. The end of the last ice age and subsequent human activity has greatly reduced the ability of the Colorado River to excavate the canyon. Dams in particular have upset patterns of sediment transport and deposition. Controlled floods from Glen Canyon Dam upstream have been conducted to see if they have a restorative effect. Earthquakes and mass wasting erosive events still affect the region.".
- Geology_of_the_Grand_Canyon_area thumbnail Grand_Canyon_from_Navajo_Point-crop.jpg?width=300.
- Geology_of_the_Grand_Canyon_area wikiPageExternalLink ?id=zzEvTydPU8QC.
- Geology_of_the_Grand_Canyon_area wikiPageExternalLink gc_layer.htm.
- Geology_of_the_Grand_Canyon_area wikiPageExternalLink 72157631569550151.
- Geology_of_the_Grand_Canyon_area wikiPageExternalLink index.cfm.
- Geology_of_the_Grand_Canyon_area wikiPageExternalLink geologicformations.htm.
- Geology_of_the_Grand_Canyon_area wikiPageExternalLink index.htm.
- Geology_of_the_Grand_Canyon_area wikiPageExternalLink geologygraphic.html.
- Geology_of_the_Grand_Canyon_area wikiPageExternalLink grand.pdf.
- Geology_of_the_Grand_Canyon_area wikiPageExternalLink movie.
- Geology_of_the_Grand_Canyon_area wikiPageID "621004".
- Geology_of_the_Grand_Canyon_area wikiPageRevisionID "606810029".
- Geology_of_the_Grand_Canyon_area hasPhotoCollection Geology_of_the_Grand_Canyon_area.
- Geology_of_the_Grand_Canyon_area subject Category:Articles_which_contain_graphical_timelines.
- Geology_of_the_Grand_Canyon_area subject Category:Geology_of_Arizona.
- Geology_of_the_Grand_Canyon_area subject Category:Grand_Canyon.
- Geology_of_the_Grand_Canyon_area subject Category:Regional_geology_of_the_United_States.
- Geology_of_the_Grand_Canyon_area comment "The geology of the Grand Canyon area includes one of the most complete and studied sequences of rock on Earth. The nearly 40 major sedimentary rock layers exposed in the Grand Canyon and in the Grand Canyon National Park area range in age from about 200 million to nearly 2 billion years old. Most were deposited in warm, shallow seas and near ancient, long-gone sea shores in western North America.".
- Geology_of_the_Grand_Canyon_area label "Geologia della zona del Grand Canyon".
- Geology_of_the_Grand_Canyon_area label "Geologie des Grand Canyon".
- Geology_of_the_Grand_Canyon_area label "Geology of the Grand Canyon area".
- Geology_of_the_Grand_Canyon_area label "Geología del área del Gran Cañón".
- Geology_of_the_Grand_Canyon_area sameAs Geologie_des_Grand_Canyon.
- Geology_of_the_Grand_Canyon_area sameAs Geología_del_área_del_Gran_Cañón.
- Geology_of_the_Grand_Canyon_area sameAs Geologia_della_zona_del_Grand_Canyon.
- Geology_of_the_Grand_Canyon_area sameAs Q970737.
- Geology_of_the_Grand_Canyon_area sameAs Q970737.
- Geology_of_the_Grand_Canyon_area wasDerivedFrom Geology_of_the_Grand_Canyon_area?oldid=606810029.
- Geology_of_the_Grand_Canyon_area depiction Grand_Canyon_from_Navajo_Point-crop.jpg.
- Geology_of_the_Grand_Canyon_area isPrimaryTopicOf Geology_of_the_Grand_Canyon_area.
