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Indian Rock in Montebello, New York is a large glacial erratic boulder of granite gneiss, formed in the Proterozoic (Precambrian) era, 1.2 billion to 800 million years ago. It is estimated to weigh ≈17,300 tons. Madison Boulder, a 5,000-short-ton (4,500 t) glacial erratic the size of a large house in Madison, New Hampshire.
Kame terraces are frequently found along the side of a glacial valley and are stratified deposits of meltwater streams flowing between the ice and the adjacent valley side. [4] These kame terraces tend to look like long, flat benches, with many pits on the surface made by kettles.
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 ...
Arête – Narrow ridge of rock which separates two valleys formed by glacial movement; Cirque – Amphitheatre-like valley formed by glacial erosion; Col – Lowest point on a mountain ridge between two peaks; Crevasse – Deep crack, or fracture, in an ice sheet or glacier; Corrie – Amphitheatre-like valley formed by glacial erosion or cwm
Rounded erratic boulders of crystalline rock composition next to Ordovician limestone bank along the shoreline in NW Osmussaar, Estonia.. In geology, drift is a name for all sediment (clay, silt, sand, gravel, boulders) transported by a glacier and deposited directly by or from the ice, or by glacial meltwater.
Fluvio-glacial processes can occur on the surface and within the glacier. The deposits that happen within the glacier are revealed after the entire glacier melts or partially retreats. Fluvio-glacial landforms and erosional surfaces include: outwash plains, kames, kame terraces, kettle holes, eskers, varves, and proglacial lakes. [4]
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Transverse crevasses, Chugach State Park, Alaska A crevasse is a deep crack that forms in a glacier or ice sheet. Crevasses form as a result of the movement and resulting stress associated with the shear stress generated when two semi-rigid pieces above a plastic substrate have different rates of movement.