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A dissected plateau is a plateau area that has been severely eroded such that the relief is sharp. Such an area may be referred to as mountainous, but dissected plateaus are distinguishable from orogenic mountain belts by the lack of folding , metamorphism , extensive faulting , or magmatic activity that accompanies orogeny .
Hachure representation of relief was standardized by the Austrian topographer Johann Georg Lehmann in 1799. [1] Hachures may be combined with other ways of representing relief, such as shades, the result being a shaded hachure map; an example of such a map is the Dufour Map of Switzerland . [ 2 ]
Inversion tectonics is recognised to form as a result of: Regional temporal variations in stress patterns within plates, resulting from forces caused by changes in plate boundary configuration, the blocking of subduction zones by buoyant crust (collision) and changes in relative motion at nearby plate boundaries.
As a result, this area of the Allegheny Plateau has lower relief and gentler slopes than the relatively rugged Unglaciated Allegheny Plateau. In general, the glaciated lies to the north and west of the unglaciated, and forms an arc in northeastern to southeastern Ohio lying between the glacial till plains and the Unglaciated Allegheny Plateau.
A submarine canyon is a steep-sided valley cut into the seabed of the continental slope, sometimes extending well onto the continental shelf, having nearly vertical walls, and occasionally having canyon wall heights of up to 5 km (3 mi), from canyon floor to canyon rim, as with the Great Bahama Canyon. [1]
Cut bank erosion and point bar deposition as seen on the Powder River in Montana. Cut banks along the Cut Bank Creek. A cut bank, also known as a river cliff or river-cut cliff, is the outside bank of a curve in a water channel (), which is continually undergoing erosion. [1]
The cliffs are noted as a textbook example of a basaltic flow with well defined joints and hexagonal columns. They were named after a band of Eastern Shoshone known as Tukuaduka ( sheep eaters ). Many of the exposed cliffs are located along a steep inaccessible canyon cut by the Gardner near Bunsen Peak , but some of the cliffs located just off ...
The Gorda Ridge has an average depth of 3000 m, with a few locations reaching depths of 3500 m. The walls of this valley are steep, in most cases giving a vertical relief of over 1000 m. [9] The floor of the southern ridge valley has been filled in with roughly 1000 m of sediment from the continental margin, mostly delivered by turbidity ...