- Glacial boundary
A glacial boundary is a line on a map representing the furthest advance of a
glacierthat has retreated. It generally refers to the extent of continental, rather than alpine, glaciers.
In the northern hemisphere, glaciers advanced from the north during the
Pleistoceneepoch. The glacial boundary thus represents the furthest southern extent of the glaciers at that time.
In North America, the boundary from the most recent ice sheet passes through the states of New York, New Jersey, Pennsylvania, Ohio, Kentucky, Indiana, Illinois, Missouri, Kansas, Nebraska, South Dakota, Montana, and Washington. It also crosses the U.S.-Canadian border several times.
Timeline of glaciation.
See the U.S. [http://www.nationalatlas.gov National Atlas] for a [http://www.nationalatlas.gov/articles/geology/features/glaciallimit.html map of the boundary] in North America.
Wikimedia Foundation. 2010.
Look at other dictionaries:
boundary ecosystem — ▪ biology Introduction complex of living organisms in areas where one body of water meets another, e.g., estuaries and lagoons, or where a body of water meets the land, e.g., marshes. The latter are often called wetlands. Boundary… … Universalium
Boundary Waters Canoe Area Wilderness — Infobox protected area | name = Boundary Waters Canoe Area Wilderness iucn category = III iucn category = Ib caption = locator x = 162 locator y = 25 location = Minnesota, USA nearest city = Ely, MN lat degrees = 47 lat minutes = 49 lat seconds … Wikipedia
Last Glacial Maximum — The Last Glacial Maximum (LGM) refers to the time of maximum extent of the ice sheets during the last glaciation (the Würm or Wisconsin glaciation), approximately 20,000 years ago. This extreme persisted for several thousand years. At this time,… … Wikipedia
valley — valleylike, adj. /val ee/, n., pl. valleys. 1. an elongated depression between uplands, hills, or mountains, esp. one following the course of a stream. 2. an extensive, more or less flat, and relatively low region drained by a great river system … Universalium
George Frederick Wright — (January 22, 1838 ndash; April 20, 1921) was an American geologist and a professor at Oberlin Theological Seminary, first of New Testament language and literature (1881 ndash; 1892), and then of harmony of science and revelation (until retirement … Wikipedia
Fulton County, Pennsylvania — Location in the state of Pennsylvania … Wikipedia
Geology of Bedford County, Pennsylvania — Bedford County, Pennsylvania is situated along the western border of the Ridge and Valley physiographic province, which is characterized by folded and faulted sedimentary rocks of early to middle Paleozoic age. The northwestern border of the… … Wikipedia
граница наибольшего распределения ледникового покрова в данной области — — [http://slovarionline.ru/anglo russkiy slovar neftegazovoy promyishlennosti/] Тематики нефтегазовая промышленность EN glacial boundary … Справочник технического переводчика
Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… … Universalium
Holocene Epoch — formerly Recent Epoch Latest interval of the Earth s geologic history, dating from 10,000 years ago to the present. The younger of the two epochs that constitute the Quaternary Period, the Holocene follows the last glacial stage of the… … Universalium