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As of 2017 [update], an estimated 700 grizzly bears were living in the Greater Yellowstone Ecosystem, [129] with about 150 grizzlies living wholly or partially within Yellowstone National Park. [130] The grizzly was initially listed as a threatened species in the contiguous United States on July 28, 1975, by the Fish and Wildlife Service. The grizzly bear was taken off the endangered species list in 2007. [131] Opponents of delisting the grizzly expressed concerns that states might once again allow hunting and that better conservation measures were needed to ensure a sustainable population. [132] A federal district judge overturned the delisting ruling in 2009, reinstating the grizzly; however, the grizzly was once again removed from the list in 2017. [131] In September 2018, a U.S. district judge ruled that the grizzly's protections must be restored in full, arguing the Fish and Wildlife Service was mistaken in removing the bear from the threatened status list. [133] Regardless of the rulings, hunting is prohibited within Yellowstone National Park. Hunters who legally hunt animals outside park boundaries may transport the carcass through the park with a permit. [134] Elk in Hayden Valley a b "U.S. Statutes at Large, Vol. 17, Chap. 24, pp. 32–33. "An Act to set apart a certain Tract of Land lying near the Headwaters of the Yellowstone River as a public Park." [S. 392]". Archived from the original on June 24, 2013. Baker, Brett J.; Saw, Jimmy H.; Lind, Anders E.; Lazar, Cassandra Sara; Hinrichs, Kai-Uwe; Teske, Andreas P.; Ettema, Thijs J.G. (February 16, 2016). "Genomic inference of the metabolism of cosmopolitan subsurface Archaea, Hadesarchaea". Nature Microbiology. 1 (3): 16002. doi: 10.1038/nmicrobiol.2016.2. PMID 27572167. The most famous geyser in the park, and perhaps the world, is Old Faithful geyser, located in Upper Geyser Basin. Castle Geyser, Lion Geyser, Beehive Geyser, Grand Geyser (the world's tallest predictable geyser), Giant Geyser (the world's most voluminous geyser), Riverside Geyser and numerous other geysers are in the same basin. The park contains the tallest active geyser in the world— Steamboat Geyser in the Norris Geyser Basin. A study that was completed in 2011 found that at least 1,283 geysers have erupted in Yellowstone. Of these, an average of 465 are active in a given year. [90] [91] Yellowstone contains at least 10,000 geothermal features altogether, including geysers, hot springs, mudpots, and fumaroles. [92] Over half of the world's geysers and hydrothermal features are concentrated in Yellowstone. [93] [17]
Jones, William A. (1875). Report Upon the Reconnaissance of Northwestern Wyoming, Including Yellowstone National Park, Made in the Summer of 1873. U.S. Government Printing Office. p. 1. ISBN 0331948184. Microbes in Colorful Yellowstone Hot Springs Fueled By Hydrogen, CU-Boulder Researchers Say". University of Colorado at Boulder. January 24, 2005. Archived from the original on April 26, 2013 . Retrieved March 13, 2007.Rappaport Clark, Jamie (March 21, 2020). "We Were Wrong About Wolves, Here's Why". Defenders of Wildlife . Retrieved June 7, 2023. Fire Facts". Yellowstone Wildland Fire. National Park Service. October 25, 2006. Archived from the original on April 25, 2007 . Retrieved March 21, 2007. On March 10, 2004, a biologist discovered 5 dead bison which apparently had inhaled toxic geothermal gases trapped in the Norris Geyser Basin by a seasonal atmospheric inversion. This was closely followed by an upsurge in earthquake activity in April 2004. [97] In 2006, it was reported that the Mallard Lake Dome and the Sour Creek Dome—areas that have long been known to show significant changes in their ground movement—had risen at a rate of 1.5 to 2.4 inches (3.8 to 6.1cm) per year from mid–2004 through 2006. As of late 2007, the uplift has continued at a reduced rate. [98] [99] These events inspired a great deal of media attention and speculation about the geologic future of the region. Experts responded to the conjecture by informing the public that there was no increased risk of a volcanic eruption in the near future. [100] However, these changes demonstrate the dynamic nature of the Yellowstone hydrothermal system. Yellowstone National Park Archives". National Park Service. Archived from the original on December 3, 2009 . Retrieved November 20, 2009.
An Act to set apart a certain tract of Land lying near the Head-waters of the Yellowstone River as a Public Park" (PDF). Library of Congress. Grizzly Bears". nps.gov. National Park Service. April 2, 2018. Archived from the original on October 10, 2018. Retrieved December 19, 2018. BYU Larsen Yellowstone collection at the L. Tom Perry Special Collections Library of Brigham Young University The Grand Canyon of the Yellowstone". American Studies at the University of Virginia. University of Virginia. Archived from the original on October 1, 2013 . Retrieved May 16, 2007.Yellowstone in United States of America". protectedplanet.net. IUCN. Archived from the original on August 27, 2019 . Retrieved December 31, 2018. Mountain Lions". National Park Service. July 26, 2006. Archived from the original on September 3, 2007 . Retrieved March 19, 2007. Main articles: Geothermal areas of Yellowstone, Yellowstone Caldera, and Yellowstone hotspot Volcanism [ edit ] Columnar basalt near Tower Fall; large floods of basalt and other lava types preceded mega-eruptions of superheated ash and pumice. Caldera rim on the horizon south of Yellowstone Lake a b "Grizzly Bears & the Endangered Species Act". nps.gov. National Park Service. October 5, 2018. Archived from the original on October 13, 2018. Retrieved December 19, 2018.
History & Culture". General Grant National Memorial. National Park Service. July 25, 2006. Archived from the original on April 13, 2012 . Retrieved April 23, 2007. Main articles: Trails of Yellowstone National Park and Angling in Yellowstone National Park Union Pacific Railroad brochure promoting travel to the park (1921)Yellowstone National Park's First 130 Years". Yellowstone History. National Park Service. Archived from the original on November 9, 2013 . Retrieved April 1, 2007. The Civilian Conservation Corps (CCC), a New Deal relief agency for young men, played a major role between 1933 and 1942 in developing Yellowstone facilities. CCC projects included reforestation, campground development of many of the park's trails and campgrounds, trail construction, fire hazard reduction, and fire-fighting work. The CCC built the majority of the early visitor centers, campgrounds, and the current system of park roads. [63] Lahren, Larry (2006). Homeland: An archaeologist's view of Yellowstone Country's past. Cayuse Press. p.161. ISBN 978-0-9789251-0-9.
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