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Cliff & Talus

Cliff and talus communities are a system that includes cliff faces, ledges, cliff-top outcrops or cliff-edge, and the cliff base. The cliff face of some cliff types may be shear or vertical, they may be deeply recessed and cave-like (e.g. rockhouses), they may be very steeply sloping and with or without ledges. At the top of many Tennessee cliffs at the cliff edge there may be open glade-like outcrops. These are here considered and have been considered by others to be part of the overall cliff community. All cliff communities are subject to erosional forces. Water, wind, mass wasting, freeze-thaw processes are often the major forces responsible for maintaining cliff communities. These erosional processes result in much material be deposited at the base of the cliff. This jumbled mass of material--called talus and resulting in the formation of a talus slope--is often unstable and loose and is itself often subject to slope creep. Tennessee's cliffs are associated mostly with consolidated rock formations such as limestone, dolomite, shale, sandstone, and a variety of metamorphic types. In the Coastal Plain of West Tennessee there are also cliffs that are formed of unconsolidated materials such as gravel, clay, loess, and lignite. Below, the cliff types of Tennessee are classified by their geology and physiographic location.

UNCONSOLIDATED CLIFF

  • Loess Bluff Unconsolidated Cliff
  • West Tennessee Plain Unconsolidated Cliff

LIMESTONE CLIFF 

  • Western Valley Limestone Cliff
  • Western Highland Rim Limestone Cliff
  • Nashville Basin Limestone Cliff
  • Eastern Highland Rim Limestone Cliff
  • Cumberland Plateau Limestone Cliff
  • Ridge and Valley Limestone Cliff

DOLOMITE CLIFF

  • Ridge and Valley Dolomite Cliff
  • Blue Ridge Dolomite Cliff

CHERT CLIFF    

  • Western Highland Rim Chert Cliff
  • Eastern Highland Rim Chert Cliff 

SHALE CLIFF

  • Western Highland Rim Shale Cliff
  • Nashville Basin Shale Cliff
  • Eastern Highland Rim Shale Cliff
  • Cumberland Plateau Shale Cliff
  • Ridge and Valley Shale Cliff

SANDSTONE CLIFF

  • Cumberland Plateau Sandstone Rockhouse
  • Cumberland Plateau Sandstone Cliff
  • Ridge and Valley Sandstone Cliff
  • Blue Ridge Sandstone Cliff

METAMORPHIC CLIFF

   Phyllite
  • Blue Ridge Phyllite Cliff
   Quartzite
  • Blue Ridge Quartzite Cliff

   Gneiss

  • Blue Ridge Gneiss Cliff