Erosional landscapes: Influence of rock strength and structure on landforms @TheGeoModels

Uploaded January 2015 | Updated September 2026, 4 hours ago

Coordinates of large breached anticline structure:

37.10N, 81.34W

Geologic Map overlay: Virginia Division of Mineral Resources (1993, 2003). .kmz file availabe at
mrdata.usgs.gov/geology/state/state.php?state=VA

Hillshade overlay DEM data from

nationalmap.gov/viewer.html

Erosional landscapes: Influence of rock strength and structure on landforms

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$Fold-thrust belt topography: The Ouachita Mountains, whetstone capital of the world This video shows how different sedimentary rock types folded into distinct structures control topography in the Ouachita Mountains of Arkansas and Oklahoma. The chert, or novaculite, ridges in this area are sources of raw materials for making the worlds finest natural sharpening stones. Novaculite is essentially slightly recrystallized chert, and the extremely high silica content and fine grain produce an outstanding abrasive stone for honing fine edges onto steel tools. These whetstones are often sold as Arkansas Stones or Ouachita (Washita) Stones, and have been produced in the area since the early 19th century. The original users of the material were, of course, Native Americans in the region, who produced exceptional points and cutting tools from the conchoidally-fracturing novaculite.$

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