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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.
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.
Jointing that contributes to their shape typically predates glaciation, and roche moutonnée-like forms can be found in tropical areas such as East Africa and Australia. Further, at Ivö Lake in Sweden, rock surfaces exposed by kaolin mining and then weathered resemble roche moutonnée. [4]
Rôche moutonnée – Rock formation created by the passing of a glacier; List of rock formations; Strike ridge – Ridge with a moderate sloping backslope and steeper frontslope; Structural bench – Long, relatively narrow land bounded by distinctly steeper slopes above and below
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.
The landform is an example of a rôche moutonnée [4] with clear lee and stoss slopes. Lembert Dome was named for John Baptist Lembert, sometimes erroneously spelled Lambert, who took up a homestead in a section of Tuolumne Meadows in 1885. [2] [5] [6] The Wheeler Survey referred to it as Soda Springs Dome, and John Muir called it Glacier Rock. [7]
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 Talkeetna Mountains (Dghelaay tahwt’aene in Ahtna) are a mountain range in AlaskaThe Matanuska and Susitna River valleys, with towns such as Trapper Creek, Talkeetna, Wasilla, Palmer, Sutton, and Chickaloon, roughly bound the Talkeetnas in the westerly parts of the range.