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Finally, the water leaves the glacier through proglacial streams or lakes. [2] Proglacial streams do not only act as the terminus point but can also receive meltwater. [2] Glacial streams can play a significant role in energy exchange and in the transport of meltwater and sediment. [3]
Multiple erratics on the terminal moraine of the Okanogan Lobe. The Cascade Mountains are in the background.. The term "erratic" is commonly used to refer to erratic blocks, which geologist Archibald Geikie describes as: "large masses of rock, often as big as a house, that have been transported by glacier ice, and have been lodged in a prominent position in the glacier valleys or have been ...
The Laurentian Channel, 25–30 km wide in some areas, 100 km long, and greater than 100 m deep, still lacks data regarding its total size and sediments, relying on well sites for information. Sediments in the channel range from sands and gravels near the bottom and clay-like silts near the top. [8]
The Laurentide ice sheet (LIS) was a massive sheet of ice that covered millions of square miles, including most of Canada and a large portion of the Northern United States, multiple times during the Quaternary glaciation epochs, from 2.58 million years ago to the present.
Subglacial streams can transport, deposit, and remove sediment from the glacier bed; this process is influenced by water supply and the amount and characteristics of the available sediment. [12] The size of sediment particles, the slope of the subglacial stream’s channel, and the roughness of the bed all contribute to whether sediment is ...
The height and width of an esker are determined by the water and ice pressure and sediment load at the time of formation. [36] Eskers form in ice tunnels within or under a glacier, as shown in Figure 1, and are composed of the sediment deposits from the streams that occupy these tunnels. [37]
In geography and geology, fluvial sediment processes or fluvial sediment transport are associated with rivers and streams and the deposits and landforms created by sediments. It can result in the formation of ripples and dunes , in fractal -shaped patterns of erosion, in complex patterns of natural river systems, and in the development of ...
Stratified sediment was deposited rapidly on the high-relief erosional surface. Up to 150 metres (490 ft) in some areas, the deposits occurred on surfaces defined by highly eroded channels and drumlin uplands. [4] The channel tunnels were primarily created by the erosion from glacial rivers, a typical process before moraine formation.