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A drumlin, from the Irish word droimnín ("little ridge"), first recorded in 1833, in the classical sense is an elongated hill in the shape of an inverted spoon or half-buried egg [1] [2] formed by glacial ice acting on underlying unconsolidated till or ground moraine.
Drumlin is a linguistic diminutive of drum, and it means a small rounded hill of glacial formation, often seen in series (OED). A landscape of many drumlins occurs in some parts of Ireland, including counties Cavan and Armagh. Drumlin is an established technical word in geology, but drum is almost never used. drisheen (from drisín or drúishin ...
Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
Drumlins may be composed of stratified or unstratified till ranging in size from sand to boulders. The non-uniformity of drumlin composition is representative of the diverse origin of the sediments. [38] Banding or layering of till may occur in drumlins as till accumulates on the drumlin formation in successive layers. [38]
Also amphidrome and tidal node. A geographical location where there is little or no tide, i.e. where the tidal amplitude is zero or nearly zero because the height of sea level does not change appreciably over time (meaning there is no high tide or low tide), and around which a tidal crest circulates once per tidal period (approximately every 12 hours). Tidal amplitude increases, though not ...
The Namibian drumlins are a geologic feature in Namibia. Since drumlins only occur as the result of glaciers, researchers determined they are the relic of an ice age in the late Paleozoic Era. [1] The researchers measured the supposed rock drumlins with satellite imagery available on the Internet.
An 1841 engraving of Cumorah (looking south), where Joseph Smith said he was given golden plates by an angel named Moroni, on the west side, near the peak.. Cumorah (/ k ə ˈ m ɔːr ə /; [2] also known as The Sacred Grove is a drumlin in Palmyra, New York, United States, [3] where Joseph Smith said he found a set of golden plates which he translated into English and published as the Book of ...
The Withrow Moraine and Jameson Lake Drumlin Field National Natural Landmark is located on the Waterville Plateau, which lies in the northwest corner of the Columbia River Plateau. The plateau is formed on top of the Columbia River Basalt Group a large igneous province that lies across parts of the states of Washington , Oregon , and Idaho in ...