Editing Grand Teton National Park (section)

=== Glaciation ===
[[File:Middle Teton Glacier looking southeast.jpg|right|thumb|[[Middle Teton Glacier]] on the northeast slopes of Middle Teton has numerous [[crevass]]es.]]
The major peaks of the Teton Range were carved into their current shapes by long-vanished [[glacier]]s. Commencing 250,000–150,000&nbsp;years ago, the Tetons went through several periods of [[glacial period|glaciation]] with some areas of Jackson Hole covered by glaciers {{convert|2000|ft|abbr=on}} thick.<ref name=geology/><ref name=love2>{{cite book|last=Love|first=David|title=Creation of the Teton Landscape|year=1997|publisher=Grand Teton Natural History Association|isbn=978-0-931895-08-1|at=Quaternary-Time of Ice, More Lakes and Continued Crustal Disturbance|url=https://www.nps.gov/parkhistory/online_books/grte/grte_geology/sec9.htm|access-date=August 23, 2012|url-status=live|archive-url=https://web.archive.org/web/20161108080217/https://www.nps.gov/parkhistory/online_books/grte/grte_geology/sec9.htm|archive-date=November 8, 2016|df=mdy-all}}</ref> This heavy glaciation is unrelated to the uplift of the range itself and is instead part of a period of global cooling known as the [[Quaternary glaciation]].<ref name=love2/> Beginning with the Buffalo Glaciation and followed by the [[Bull Lake glaciation|Bull Lake]] and then the [[Last glacial period|Pinedale glaciation]], which ended roughly 15,000&nbsp;years ago, the landscape was greatly impacted by glacial activity. During the Pinedale glaciation, the landscape visible today was created as glaciers from the Yellowstone Plateau flowed south and formed Jackson Lake, while smaller glaciers descending from the Teton Range pushed rock [[moraines]] out from the canyons and left behind lakes near the base of the mountains.<ref name=love2/> The peaks themselves were carved into [[Pyramidal peak|horns]] and [[arête]]s and the canyons were transformed from water-eroded V-shapes to glacier-carved U-shaped valleys.<ref name=geology/> Approximately a dozen glaciers currently exist in the park, but they are not ancient as they were all reestablished sometime between 1400 and 1850&nbsp;AD during the [[Little Ice Age]].<ref name=keller2>{{cite web|last=Keller|first=Lynn|title=Glaciers and Climate Change|url=http://www.nature.nps.gov/geology/inventory/publications/reports/grte_gri_rpt_body_print.pdf|work=Grand Teton National Park and John D. Rockefeller Jr. Memorial Parkway Geologic Resources Inventory Report|publisher=National Park Service|access-date=February 4, 2012|pages=8–9|year=2010|url-status=live|archive-url=https://web.archive.org/web/20120923122521/http://www.nature.nps.gov/geology/inventory/publications/reports/grte_gri_rpt_body_print.pdf|archive-date=September 23, 2012|df=mdy-all}}</ref> Of these more recent glaciers, the largest is [[Teton Glacier]], which sits below the northeast face of Grand Teton. Teton Glacier is {{convert|3500|ft|abbr=on}} long and {{convert|1100|ft|abbr=on}} wide, and nearly surrounded by the tallest summits in the range.<ref name=love2/> Teton Glacier is also the best-studied glacier in the range, and researchers concluded in 2005 that the glacier could disappear in 30 to 75&nbsp;years.<ref name=nrp/> West of the Cathedral Group near [[Hurricane Pass]], [[Schoolroom Glacier]] is tiny but has well-defined terminal and lateral moraines, a small [[proglacial lake]], and other typical glacier features near each other.<ref>{{cite book|last=Cooper|first=Ed|title=Soul of the Rockies: Portraits of America's Largest Mountain Range|year=2008|publisher=Falcon Guides|isbn=978-0-7627-4941-6|page=75|url=https://books.google.com/books?id=yRggz0glL3gC&pg=PT95|edition=1st|access-date=February 4, 2012}}{{Dead link|date=July 2024 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>