Web Results
Content Results
  • Geology of the Grand Canyon area

    serch.it?q=Geology-of-the-Grand-Canyon-area

    The Grand Canyon from Navajo Point. The Colorado River is to the right and the North Rim is visible at left in the distance. The view shows nearly every sedimentary layer described in this article. 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 lithified sand dunes from an extinct desert. There are at least 14 known unconformities in the geologic record found in the Grand Canyon. 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 . 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, 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 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. cross section of the Grand Canyon. Black numbers correspond to subsection numbers in section 1 and white numbers are referred to in the text|alt=An exhibit with different rock layers cut out from a canyon wall

  • Bright Angel (Waterhouse)

    serch.it?q=Bright-Angel-(Waterhouse)

    Bright Angel is a composition for three bassoons and contrabassoon by Graham Waterhouse. It was composed in 2008 for the annual conference of the International Double Reed Society.

  • Maswik Lodge

    serch.it?q=Maswik-Lodge

    Maswik Lodge Cafeteria / Lounge in October 2018Maswik Lodge is a lodge in Grand Canyon National Park that is run by Xanterra Parks & Resorts. It is named after a Hopi Kachina figure said to watch over the Grand Canyon. Maswik Lodge is located about from the South Rim of the Grand Canyon. It is on the west side of Grand Canyon Village. The lodge contains a cafeteria, lounge, and many spread out room complexes.

Map Box 1