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Roche moutonnée near Myot Hill, Scotland In glaciology, a roche moutonnée (or sheepback) is a rock formation created by the passing of a glacier.The passage of glacial ice over underlying bedrock often results in asymmetric erosional forms as a result of abrasion on the "stoss" (upstream) side of the rock, and plucking (i.e. pieces cracked off) on the "lee" (downstream) side.
Erosional landforms. As the glaciers expand, due to their accumulating weight of snow and ice they crush, abrade, and scour surfaces such as rocks and bedrock.The resulting erosional landforms include striations, cirques, glacial horns, arêtes, trim lines, U-shaped valleys, roches moutonnées, overdeepenings and hanging valleys.
The Abbey Craig, a crag with tail near the University of Stirling.The Wallace Monument stands on the crag at the right, and the long tail slopes down leftward Salisbury Crags to the left and Arthur's Seat to the right, with their tails sloping east to the right.
Cadair Idris or Cader Idris is a mountain in the Meirionnydd area of Gwynedd, Wales.It lies at the southern end of the Snowdonia National Park near the town of Dolgellau.The peak, which is one of the most popular in Wales for walkers and hikers, [1] is composed largely of Ordovician igneous rocks, with classic glacial erosion features such as cwms, moraines, striated rocks, and roches moutonnées.
Mt. Susitna is a roche moutonnée, a landform created when a glacier flows over a resistant, topographically high, bedrock body, creating a smooth-sided and teardrop shaped feature aligned with the direction of ice flow. [5] The Anchorage bowl topography has been influenced by 5-7 glaciations.
Lembert Dome is a granite dome rock formation in Yosemite National Park in the US state of California.The dome soars 800 feet (240 m) above Tuolumne Meadows and the Tuolumne River and can be hiked starting at the Tioga Road in the heart of Tuolumne Meadows, 8 miles (13 km) west of the Tioga Pass Entrance to Yosemite National Park.
Rosthwaite is host to many interesting post-glacial geographical features. The town nestles underneath the How, a large roche moutonnée, with a smaller roche moutonnée being further to the west. Near to and within Rosthwaite is also a set of terminal moraines which show the staggered retreat of the Stonethwaite Glacier.
The following affect the rate of abrasion: [1] The amount of rock debris embedded in the basal surface of the ice. If there is no rock in the basal surface of the ice there will be no abrasion, but if there is too much rock in the basal surface of the ice the motion of the glacier will be affected, thus affecting abrasion rates.