A terminal moraine, also called an end moraine, is a type of moraine that forms at the terminal (edge) of a glacier, marking its maximum advance. At this point, debris that has accumulated by plucking and abrasion, has been pushed by the front edge of the ice, is driven no further and instead is deposited in an unsorted pile of sediment. Because the glacier acts very much like a conveyor belt, the longer it stays in one place, the greater the amount of material that will be deposited. The moraine is left as the marking point of the terminal extent of the ice.
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👉 Terminal moraine in the context of Moraine
A moraine is any accumulation of unconsolidated debris (regolith and rock), sometimes referred to as glacial till, that occurs in both currently and formerly glaciated regions, and that has been previously carried along by a glacier or ice sheet. It may consist of partly rounded particles ranging in size from boulders (in which case it is often referred to as boulder clay) down to gravel and sand, in a groundmass of finely-divided clayey material sometimes called glacial flour. Lateral moraines are those formed at the side of the ice flow, and terminal moraines are those formed at the foot, marking the maximum advance of the glacier. Other types of moraine include ground moraines (till-covered areas forming sheets on flat or irregular topography) and medial moraines (moraines formed where two glaciers meet).
In this Dossier
- ⭐ Core Definition: Terminal moraine
- 👉 Terminal moraine in the context of Moraine
- Terminal moraine in the context of Till
- Terminal moraine in the context of Ribbon lake
- Terminal moraine in the context of Glacial lake outburst flood
- Terminal moraine in the context of Outer Lands
- Terminal moraine in the context of Finger lake
- Terminal moraine in the context of Hoge Veluwe National Park
- Terminal moraine in the context of Kame
Terminal moraine in the context of Till
Till or glacial till is unsorted glacial sediment.
Till is derived from the erosion and entrainment of material by the moving ice of a glacier. It is deposited some distance down-ice to form terminal, lateral, medial and ground moraines.
Terminal moraine in the context of Ribbon lake
A ribbon lake is a long and very deep, finger-shaped lake, usually found in a glacial trough. As such, a ribbon lake is one of a number of glacial landscapes, including arêtes, corries, rock lips, rock basins and terminal moraines.
Such a lake's formation begins when a glacier moves over an area containing alternate bands of hard and soft bedrock. The sharp-edged boulders that are picked up by the glacier and carried at the bottom of the glacier erode the softer rock more quickly by abrasion, thus creating a hollow called a rock basin. On either side of the rock basin, the more resistant rock is eroded less and these outcrops of harder rock are known as rock bars, which act as dams between which rainwater may accumulate after the retreat of the ice age, filling up the rock basin and creating a ribbon lake. A ribbon lake may also form behind a terminal or recessional moraine, both of which also act as dams, enabling water to accumulate behind them.
Terminal moraine in the context of Glacial lake outburst flood
A glacial lake outburst flood (GLOF) is a type of outburst flood caused by the failure of a dam containing a glacial lake. An event similar to a GLOF, where a body of water contained by a glacier melts or overflows the glacier, is called a jökulhlaup. The dam can consist of glacier ice or a terminal moraine. Failure can happen due to erosion, a buildup of water pressure, an avalanche of rock or heavy snow, an earthquake or cryoseism, volcanic eruptions under the ice, or massive displacement of water in a glacial lake when a large portion of an adjacent glacier collapses into it.
Increasing glacial melting because of climate change, alongside other environmental effects of climate change (i.e. permafrost melting) mean that regions with glaciers are likely to see increased flooding risks from GLOFs. This is especially true in the Himalayas where geologies are more active.
Terminal moraine in the context of Outer Lands
40°48′N 73°18′W / 40.8°N 73.3°W
The Outer Lands is the prominent terminal moraine archipelagic region off the southern coast of New England in the United States. This eight-county region of Massachusetts, Rhode Island, and New York comprises the peninsula of Cape Cod and the islands of Nantucket, Martha's Vineyard, the Elizabeth Islands, Block Island, and Long Island, as well as surrounding islands and islets.
Terminal moraine in the context of Finger lake
A finger lake, also known as a fjord lake or trough lake, is "a narrow linear body of water occupying a glacially overdeepened valley and sometimes impounded by a morainic dam." Where one end of a finger lake is drowned by the sea, it becomes a fjord or sea-loch.
Terminal moraine in the context of Hoge Veluwe National Park
De Hoge Veluwe National Park (Dutch pronunciation: [də ˈɦoːɣə ˈveːlyʋə]; "The High Veluwe") is a Dutch national park in the province of Gelderland near the cities of Ede, Wageningen, Arnhem and Apeldoorn. It is approximately 55 km (14,000 acres; 21 sq mi) in area, consisting of heathlands, sand dunes, and woodlands. It is situated in the Veluwe, the area of the largest terminal moraine in the Netherlands. Most of the landscape of the park and the Veluwe was created during the last ice age. The alternating sand dune areas and heathlands may have been caused by human utilization of the surrounding lands. The park forms one of the largest continuous nature reserves in the Netherlands.
Terminal moraine in the context of Kame
A kame, or knob, is a glacial landform, an irregularly shaped hill or mound composed of sand, gravel and till that accumulates in a depression on a retreating glacier, and is then deposited on the land surface with further melting of the glacier. Kames are often associated with kettles, and this is referred to as kame and kettle or knob and kettle topography. The word kame is a variant of comb (kame, or kaim is the Old Scottish word meaning 'comb'), which has the meaning "crest" among others. The geological term was introduced by Thomas Jamieson in 1874.
According to White, "kames were formed by meltwater which deposited more or less washed material at irregular places in and along melting ice. At places the material is very well washed and stratified; at others it is more poorly washed, with inclusions of till masses that fell from ice but were covered before they were completely washed. Kame gravels thus tend to be variable and range from fine to coarse grained and even to cobbly and boulder."