Landforms Of Glaciated Lowlands

Landforms of Glaciated Lowlands

Most of the glaciated lowlands have depositional features, but where rock masses project above the level surface, they result in striking features of erosion, such as the Roche moutonnee and crag and tail.
 
Landforms Of Glaciated Lowlands
 
ROCHE MOUTONNEE  
  • This is a resistant residual rock hummock. The surface is striated by ice movement. Its upstream side is smoothed by abrasion and its downstream side is roughened by plucking and is much steeper. Roche moutonnees are found in both highland and lowland glaciated regions.
 
CRAG AND TAIL  
  • The Crag is a mass of hard rock with a precipitous slope on the upstream side, which protects the softer leeward slope from being completely worn down by the oncoming ice. It, therefore, has a gentle tail, strewn with the eroded rock debris.
 
The following glaciated lowland features are of a depositional nature:  
 
BOULDER CLAY OR GLACIAL TILL  
Prelims Couse Ads
  • This is an unsorted glacial deposit comprising a range of eroded materials —boulders, angular stones, sticky clay, and fi ne rock flour.
ERRATIC’S
  • These are boulders of varying sizes that were transported by ice. They came with the advancing glaciers or ice sheets but when the ice melted, they were left ‘stranded’ in the regions of deposition. They are called erratic because they are composed of materials entirely different from those of the region in which they are found. Their presence in large numbers is a hindrance to farming.
 DRUMLINS  
  • These are swarms of oval, elongated ‘whaleback’ hummocks composed wholly of boulder clay, with their elongation in the direction of the ice flow, that is on the downstream side.
 ESKERS  
  • These are long, narrow, sinuous ridges composed of sand and gravel which mark the former sites of sub-glacial melt-water streams As eskers are made up of highly porous sand and gravel, water is rapidly drained off from their crests and they may not support many trees.
TERMINAL MORAINES
  • These are made up of the coarse debris deposited at the edge of the ice-sheet, to form hummocky and hilly countries such as the Baltic Heights of the North European Plain.
 
OUTWASH PLAINS
  • These are made up of fluvio glacial deposits washed out from the terminal moraines by the streams and channels of the stagnant ice mass. The melt-waters sort and re-deposit the material in a variety of forms from the low hilly heathlands where terraces, alluvial fans and deltaic deposits of the melt-water streams make up the landscape.

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