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In researching glacial features, I came across the terms esker, drumlin, and kame. I know that they are all depositional features that are shaped like a mound. My impression is that an esker is longer than a drumlin, which is longer than a kame. What other differences distinguish between the three? Eskers are glaciofluvial deposits from sediment carrying subglacial tunnels.
As the water emerges from a tunnel at the bed of an ice sheet or glacier it will slow down. Since the sediment movement depends on water velocity the sediment will be deposited.
The results is a highly localised deposition. When glaciers retreat the point of emergence for the water will of course change with the edge of the glacier. Hence the deposition will occur progressively further upstream leaving a narrow trail of sediment accumulation. Much more can be said but the result is ridges sometimes hundreds of kilometres long that extend pretty much perpendicular to the past glacier edge, the way the water flows from within to the edge of the glacier.
Kames are hummocky terrain formed by material that has been transported by glacier melt water. The reasons for the hummocks is that when the sediment was deposited, chunks of ice were buried by the sediments and when that ice melted a hummocky terrain was formed. A key here is that the deposition of sediments from sediment transport would not be able to form the irregular hummocky terrain as a primary feature, there has to be other processes involved.
Kames are therefore usually an extensive land form that does not necessarily have a preferred extension. As with eskers the origin of the water and sediment is the same, the base of the glacier. Finally, drumlins. These forms are elongated land forms, in the direction of ice flow, often some kilometres in length, width of a few hundred metres and a height of tens of metres.
This varies a lot though. These forms are not formed by running water and sediment transport but formed beneath the ice. In the literature they have been described as both depositional and erosional land forms, although a depositional formation seems to be most common. They seem to consist of whatever material is present beneath the ice but because the most common sediment beneath glaciers is till this is also what most drumlins consist of. So eskers and kames have som relationship in the origin of the sediment that make them up.
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Where are drumlin's found? Is an drumlin a result of erosion or deposition? Is a drumlin created by erosion and deposition? What is a landform that starts with the letter e? Are there any landforms that starts with an e? What is a name of a landform that starts with E? Did lori esker make parole? What are some examples of Eskers? Till , in geology, unsorted material deposited directly by glacial ice and showing no stratification. Till is sometimes called boulder clay because it is composed of clay, boulders of intermediate sizes, or a mixture of these.
Drumlins are elongated hills of glacial deposits. They can be 1 km long and m wide, often occurring in groups. A group of drumlins is called a drumlin swarm or a basket of eggs, eg Vale of Eden.
Moraines are formed from debris previously carried along by a glacier, and normally consist of somewhat rounded particles ranging in size from large boulders to minute glacial flour. Lateral moraines are formed at the side of the ice flow and terminal moraines at the foot, marking the maximum advance of the glacier. Whilst the classic drumlin is entirely a depositional form and the classic crag and tail is entirely an erosional feature, most drumlins and crag and tails show evidence of both deposition and erosion.
They are formed by the actions of meltwater streams that flow along the sides of the ice, trapped against it by the valley walls. As the valley walls warm up in summer the warm rock helps to melt the ice nearest to it, forming a long depression or trough along which meltwater flows. Outwash plains are formed in front of a glacier and are where material is deposited over a wide area, carried out from the glacier by meltwater. Discharge occurs from both the melting snout of the glacier and the emergence of meltwater streams from within the body of the glacier.
Most of the Mason esker has been removed, its sand and sorted gravel used to make concrete highway construction. Most eskers are on till plains although some are known to cut through moraines and even cross drumlins. Moraine landform formed along the valley side, middle of the valley, along the valley ground and the snout end of the glacier, whereas Esker formed in the outwash plains at the foot of the mountains.
Drumlins have been recognized as similar streamlined forms and the lernniscate loop is suggested as providing a quantitative genetic description of their shapes. OF all the topographic forms associated with the action ofland ice, none consistently possesses greater geometrical regularity or symmetry than the drumlin.
What does this curved ridge esker record. As the glaciers expand, due to their accumulating weight of snow and ice they crush and abrade and scour surfaces such as rocks and bedrock. An esker , eskar, eschar, or os, sometimes called an asar, osar, or serpent kame, is a long, winding ridge of stratified sand and gravel, examples of which occur in glaciated and formerly glaciated regions of Europe and North America.
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