Drumlin in Cato, New York

Drowned drumlin in Clew Bay

Drumlin at Withrow Moraine and Jameson Lake Drumlin Field National Natural Landmark

A drumlin (Irish droimnín, a little hill ridge) is an elongated whale-shaped hill formed by glacial action. Its long axis is parallel with the movement of the ice, with the blunter end facing into the glacial movement. Drumlins may be more than 150 ft (45 m) high and more than ½ miles (0.8 km) long, and are often in drumlin fields of similarly shaped, sized and oriented hills. Drumlins usually have layers indicating that the material was repeatedly added to a core, which may be of rock or glacial till. Drumlin, Cato, New York Image copyleft: Image taken by me, released under GFDL Pollinator 02:57, 13 Mar 2004 (UTC) ( ) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Drumlin, Cato, New York Image copyleft: Image taken by me, released under GFDL Pollinator 02:57, 13 Mar 2004 (UTC) ( ) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Cato, New York may refer to either: the Town of Cato, located in Cayuga County, New York or the Village of Cato, located within the Town of Cato and the Town of Ira. ... Download high resolution version (2272x1704, 1116 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (2272x1704, 1116 KB) Wikipedia does not have an article with this exact name. ... Clew Bay (Irish Cuan Mó) is a natural ocean bay in County Mayo, Ireland. ... Image File history File links Download high-resolution version (1266x1390, 538 KB) Photo of glacially created drumlin on the Waterville Plateau in Washington. ... Image File history File links Download high-resolution version (1266x1390, 538 KB) Photo of glacially created drumlin on the Waterville Plateau in Washington. ... The Withrow Moraine erratic on glacial till at the terminus of the Okanogan lobe. ... The panoramic view from Connors Hill, near Swifts Creek, Victoria A hill is a landform that extends above the surrounding terrain, in a limited area. ... A glacier is a large, long-lasting river of ice that is formed on land and moves in response to gravity and undergoes internal deformation. ... Drumlin Field in Eastern Wayne County, New York A drumlin field is a cluster of dozens to hundreds of similarly shaped, sized and oriented drumlins. ... The rocky side of a mountain creek near Orosí, Costa Rica. ... Categories: Geology stubs | Glaciology | Sedimentary rocks ...

There are many theories as to the exact mode of origin and plenty of controversy among geologists interested in geomorphology. Some consider them a direct formation of the ice, while a theory proposed since the 1980s by John Shaw and others postulates creation by a catastrophic flooding release of highly pressurized water flowing underneath the glacial ice. Either way, they are thought to be a waveform (similar to ripples of sand at the bottom of a stream). It is also poorly understood why drumlins form in some glaciated areas and not in others. They are often associated to ribbed moraines. The word theory has a number of distinct meanings in different fields of knowledge, depending on their methodologies and the context of discussion. ... Surface of the Earth Geomorphology is the study of landforms, including their origin and evolution, and the processes that shape them. ... Waveform quite literally means the shape and form of a signal, such as a wave moving across the surface of water, or the vibration of a plucked string. ... A ribbed moraine (also called a Rogen moraine) is a type of moraine shaped like an elongated hill, formed subglacially (i. ...

Drumlins are common in New York, the lower Connecticut River valley, eastern Massachusetts, Minnesota, Wisconsin, Southern Ontario, Poland, around the Lake of Constance in the Alps, Ireland, Finland and Patagonia. They are regarded as a creation of the last Wisconsin ice age. Clew Bay in Ireland is a good example of a 'drowned drumlin' landscape where the drumlins appear as islands in the sea, forming a 'basket of eggs' topography. Drumlins are typically aligned parallel to one another, usually clustered together in numbers reaching the hundreds or even thousands. NY redirects here. ... The Connecticut River as seen from the French King Bridge in western Massachusetts. ... This article is about the U.S. State. ... Capital Saint Paul Largest city Minneapolis Area  Ranked 12th  - Total 87,014 sq mi (225,365 km²)  - Width 250 miles (400 km)  - Length 400 miles (645 km)  - % water 8. ... Official language(s) None Capital Madison Largest city Milwaukee Area  Ranked 23rd  - Total 65,498 sq mi (169,790 km²)  - Width 260 miles (420 km)  - Length 310 miles (500 km)  - % water 17  - Latitude 42°30N to 47°3N  - Longitude 86°49W to 92°54W Population  Ranked... Southern Ontario is the portion of the Canadian province of Ontario which lies south of the French River and Algonquin Park. ... In orange the area most commonly defined as Patagonia. ... Variations in CO2, temperature and dust from the Vostok ice core over the last 400 000 years For the animated movie, see Ice Age (movie). ... Clew Bay (Irish Cuan Mó) is a natural ocean bay in County Mayo, Ireland. ...

Drumlin formation has recently been observed for the first time in Antarctica in the Rutford Ice Stream.

A similar formation, with a more resilient (generally composed of igneous or metamorphic rock) core, is a crag. Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ... The term Metamorphic can be associated with a number of meanings:- Metamorphic rock The term for rocks that have been transformed by extreme heat and pressure. ... The Abbey Craig, a crag with tail near The University of Stirling. ...

See also

• Landform
• Ribbed moraines
• Sediment
• Geology

A landform comprises a geomorphological unit. ... A ribbed moraine (also called a Rogen moraine) is a type of moraine shaped like an elongated hill, formed subglacially (i. ... Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. ... World geologic provinces Oceanic crust  0-20 Ma  20-65 Ma  >65 Ma Geologic provinces  Shield  Platform  Orogen  Basin  Large igneous province  Extended crust Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason))[1] is the science and study of the solid matter of the earth, its composition, structure...

External links

Wikimedia Commons has media related to:

Drumlin

• Diagrams of an idealized drumlin
• Douglas E. Cox, "Drumlins and subglacial meltwater floods"
• Douglas E. Cox, "The role of vortices in drumlin formation" Introductions to the current dialogue.