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The Olgas, central Australia
Sugar Loaf Mountain, Rio de Janeiro

A bornhardt (how to say: /ˈbɔrnˈhɑrt/) is a big dome-shaped, steep-sided, bald rock formation.[1][2] They are a kind of inselberg. They are usually made up of granites or gneisses, but can sometimes be found in other rock types like limestone, sandstone and conglomerate. They are named after Wilhelm Bornhardt (1864–1946), the German geologist who first described the feature.[3][4]


  1. Allaby, Michael (2004). A Dictionary of Ecology (2nd ed.). Oxford University Press. ISBN 0198609442 .
  2. Mayhew, Susan (2004). A Dictionary of Geography (3rd ed.). Oxford University Press. ISBN 0198606737 .
  3. "Glossery of Terms: Bornhardt". InfoCenter for Environmental Geology. Archived from the original on 26 October 2011.
  4. Twidale, C R; Romaní, J R V (2005). "Inselbergs and Bornhardts". Landforms and Geology of Granite Terrains. New York: A.A. Balkema. pp. 109–116. ISBN 0415364353 .

More reading

  • Twidale, C R (1981). "Granitic Inselbergs: Domed, Block-Strewn and Castellated". The Geographical Journal 147 (1): 54–71.
  • Twidale, C R (2007). "Bornhardts and associated fracture patterns". Revista de la Asociación Geológica Argentina 62 (1): 139–153. ISSN 0004-4822

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