- a ridge, mound, or irregular mass of unstratified glacial drift, chiefly boulders, gravel, sand, and clay.
- a deposit of such material left on the ground by a glacier.
Origin of moraine
Examples from the Web for morainal
The success of this undertaking will depend upon securing the co-operation of the people of the morainal belt.
There are a few exceptions where the lake is due chiefly to a morainal dam, or a dam that was formed by a landslide.Your National Parks
Enos A. Mills
Occasionally an under-cutting stream causes a morainal deposit to collapse.Watched by Wild Animals
Enos A. Mills
Beyond this level land was a talus fallen from the cliff and then a morainal trough, up which they passed to the ice above.Jack the Young Explorer
George Bird Grinnell
Below the glaciers throughout the entire Wind River Range great numbers of morainal lakes are found.Canyons of the Colorado
J. W. Powell
- a mass of debris, carried by glaciers and forming ridges and mounds when deposited
Word Origin and History for morainal
"ridge of rock deposited by a glacier," 1789, from French moraine (18c.), from Savoy dialect morena "mound of earth," from Provençal morre "snout, muzzle," from Vulgar Latin *murrum "round object," of unknown origin, perhaps from a pre-Latin Alpine language. Related: Morainal; morainic.
- A mass of till (boulders, pebbles, sand, and mud) deposited by a glacier, often in the form of a long ridge. Moraines typically form because of the plowing effect of a moving glacier, which causes it to pick up rock fragments and sediments as it moves, and because of the periodic melting of the ice, which causes the glacier to deposit these materials during warmer intervals.♦ A moraine deposited in front of a glacier is a terminal moraine. ♦ A moraine deposited along the side of a glacier is a lateral moraine. ♦ A moraine deposited down the middle of a glacier is a medial moraine. Medial moraines are actually the combined lateral moraines of two glaciers that have merged.
A pile of debris, often extending for miles, deposited by a glacier. It is composed of rock fragments transported by the ice, which are left behind when the ice melts.