A Toreva block landslide is a distinctive

landslide Landslides, also known as landslips, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, deep-seated grade (slope), slope failures, mudflows, and debris flows. Landslides occur in a variety of ...

type which may occur when a stronger material such as sandstone or limestone overlies a weaker material such as

shale Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4) and tiny fragments (silt-sized particles) of other minerals, especial ...

and an eroding agent undercuts the weaker lower layer. The type was first recognized by ''Parry Reiche'' in 1937, and takes its name from Toreva, Arizona. Toreva blocks exhibit a characteristic backward rotation toward the parent cliff. The existence of Toreva blocks may be used to infer a warmer or wetter earlier climate, e.g. toreva blocks in the

Transantarctic Mountains The Transantarctic Mountains (abbreviated TAM) comprise a mountain range of uplifted (primarily sedimentary rock, sedimentary) rock in Antarctica which extend, with some interruptions, across the continent from Cape Adare in northern Victoria La ...

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Toreva, AZ Landsliding
Geomorphology Geological processes Landslides {{geomorph-stub