Definition of overthrust in English:

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Pronunciation: /ˈōvərˌTHrəst/


The thrust of one series of rock strata over another, especially along a fault line at a shallow angle to the horizontal.
Example sentences
  • He showed that the great dislocation beneath the Moine Schists was an overthrust, but left open the question of what the original nature of the Moines had been.
  • It is true, of course, that some ‘overthrusts’ do exhibit evidence of brecciation and other such indicators of relative movement.

verb (past and past participle overthrust)

[with object]
1Force (a body of rock) over another: (as noun overthrusting) the increased overburden resulting from overthrusting
More example sentences
  • The thickness of Cenozoic alluvial fill that is overthrust at the South Karlik Tagh front is poorly constrained, and thus the amount of shortening on that bounding fault is a minimum estimate.
  • Similar thrust ridges bring tilted Neogene red beds to the surface near the northern margin of the Adak valley and indicate that the valley is being overthrust on both its north and south sides.
  • The thickness of this package of sediments is impossible to measure because of the subsequent folding and overthrusting that have taken place.
1.1(Of a body of rock) be forced over (another formation): the shales are overthrust by Carboniferous rocks
More example sentences
  • For example, in the Beysehir area, Monocl & Akay reported that Ordovician shales are overthrust by Cambrian shales, with the contact being unconformably sealed by Lower Jurassic neritic carbonates.
  • In the western quarry, folds and thrusts in green and red marker layers in intervening marls indicate that the multicoloured salt overthrust the white mylonitic salt.
  • On its southern edge the Indus Molasse is overthrust by ophiolites of the Indus Suture Zone along the SW-dipping Nidar Thrust.

For editors and proofreaders

Syllabification: o·ver·thrust

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