At least nine species of insects are endemic to Grand Canyon, and six fish species are endemic to the Colorado River basin. One reptile, three mammal, and one mollusk species are known only from the Grand Canyon region. Regionally Endemic animals, not extirpated: 5 species humpback chub, razorback sucker, flannelmouth sucker, Kaibab squirrel, and the Navajo Mexican voleįederally Endangered and Threatened Species: California condor, humpback chub, razorback sucker, Southwestern Willow Flycatcher, Ridgway's rail, Mexican Spotted Owl, yellow-billed cuckoo, and desert tortoise.Įxtirpated Species: Grizzly bear, black-footed ferret, gray wolf, jaguar, Bear Valley sandwort, Colorado Pikeminnow, bonytail, roundtail chub, and southwestern river otter. Park Endemic animals, not extirpated: 9 species 5 butterflies, 1 pseudoscorpion, 1 tarantula, 1 snake, and 1 mollusk Invertebrates: 1,443 species, including 292 butterflies and moths Learn more about geology in Grand Canyon. Palentology resources include nearly 300 diverse and globally significant fossil localities ranging from 1.2-billion-year-old stromatolites to Paleozoic trilobites, plants, reptile tracks, and marine invertebrates, and Pleistocene megafauna in caves. The geologic record in Grand Canyon is an important scientific chronicle and is largely responsible for its inspirational scenery. Geologic processes, including erosion of tributaries and slopes, and active tectonics continue to shape the canyon today. The Colorado River established its course through the canyon approximately 6 million years ago and likely evolved from pre-existing drainages to its current course. Grand Canyon National Park preserves an iconic geologic landscape and resources ranging from 1.8 billion (PreCambrian) year-old igneous and metamorphic rocks to 230 million (Triassic)-year-old sedimentary rocks, 5 million (Pliocene)-year old to recent volcanic deposits, a complex tectonic and erosional history, and unconsolidated surface deposits. The Colorado River is 1,450 miles (2,333 km) long from its source in the Rocky Mountains of Colorado to the Gulf of California. Elevation at Phantom Ranch: 2,400 feet (720 m).Average Gradient: 7 feet per mile (1.3 m/km).Volume: 5.45 trillion cubic yards (4.17 trillion m 3)Ĭolorado River in Grand Canyon National Park.Minimum at Marble Canyon, 600 feet (180 m).1882: First unsuccessful attempt to establish a Grand Canyon National Parkġ893: Designated a "forest reserve" by President Benjamin Harrison (Presidential Proclamation #45)ġ908: Established as Grand Canyon National Monument by President Theodore Roosevelt (Presidential Proclamation #794)ġ919: Designated Grand Canyon National Park by an act of Congress on February 26 (40 Stat 1175)ġ975: Grand Canyon National Park Enlargement Act enacted by Congress on January 3 (88 Stat 2089) (Public Law 93-620)ġ979: Designated a World Heritage Site on October 26Ģ019: Designated an International Dark Sky Park (IDSP) by the International Dark-Sky Association in June after being awarded Provisional IDSP status in 2016 Geography Grand Canyon National Park
0 kommentar(er)
