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CUESTA AND HOGBACK TOPOGRAPHY


Published on: 12/12/2020 4:02:51 AM

Before moving on to the discussion on ‘Cuesta and Hogback Topography’. Firstly, know that- ‘What is Topography?’

Topography is the study of the forms and features of land surfaces. It includes changes in the surface such as mountains and valleys as well as features such as rivers and roads. It can also include the surface of other planets, the moon, asteroids and meteors.

Important Terms related to the Landform

Relief

Mountain

Mountain Range

Isostasy

Valley

Basin

Horn

Arête

Alluvial Fan

U-shaped Valley

V-shaped Valley

Cuesta

Hogback

Badlan

Cuesta Topography

Cuesta topography is an asymmetric ridge in dipping sedimentary rocks as the Flatirons. It is erosional landforms developed on resistant strata having a low to moderate dip and taking the form of an asymmetrical low ridge or hill belt, with one side a steep slope and the other a gentle slope; usually associated with a coastal plain.

  • It is the most significant landform resulting from continued erosion of unidinal/ homoiclinal sedimentary structures alternated by resistant and soft rock beds.
  • As in the case of many summits in folded rocks, cuesta landforms are a half-inverted relief.

In essence they develop in tabular, weakly dipping beds under the action of differential dissection which erodes the weak beds on the high points of folds, the resistant beds at a lower structural level persisting.

Example - Magaliesberg Range, Transvaal, South Africa.

 

Hogback Topography

Hogback Topography is ridge formed by near-vertical, resistant sedimentary rock. It is sharp - crested, often saw-toothed ridges formed from the upturned edge of a resistant rock layer of sandstone, limestone or lava where sedimentary rock beds are warped by tectonic forces, erosion can reveal hogback ridges.

Example - Dinasour Ridge (USA), Dakota (USA).

Also Read | PSEUDO VOLCANIC FEATURES