Earth:Type locality (geology)

From HandWiki

Type locality, also called type area, is the locality where a particular rock type, stratigraphic unit or mineral species is first identified.[1] If the stratigraphic unit in a locality is layered, it is called a stratotype, whereas the standard of reference for unlayered rocks is the type locality.[2]

The term is similar to the term type site in archaeology or the term type specimen in biology.

Examples of geological type localities

Rocks and minerals


  • Bearpaw Formation: Bear Paw Mountains, Montana, US
  • Burgess Shale: Burgess Pass on Mount Burgess, Alberta–BC, Canada
  • Calvert Formation: Calvert Cliffs State Park, Maryland, US
  • Chapel Island Formation: Newfoundland, Canada
  • Chattanooga Shale: Chattanooga, Tennessee, US
  • Chazy Formation: Chazy, New York, US
  • Fort Payne Formation: Fort Payne, Alabama, US
  • Gault Formation: Copt Point, Folkestone, UK
  • Ste. Genevieve Limestone: Ste. Genevieve, Missouri, US
  • Upper Greensand Formation: Weald, Sussex, Hampshire
  • Holston Formation: Holston River, Tennessee, US
  • Jacobsville Sandstone: Jacobsville, Michigan, US
  • St. Louis Limestone: St. Louis, Missouri, US
  • Temple Butte Formation: Temple Butte, Grand Canyon, US[15]
  • Waulsortian mudmound: Waulsort, Namur, Belgium

See also


  1. "Scottish Geology, Glossary: Type locality/area". Hunterian Museum and Art Gallery of the University of Glasgow. 
  2. "Stratotypes and Type Localities". International Commission on Stratigraphy. 
  3. "Benmoreite". Oxford Index. Oxford University Press. 
  4. Harms U., Koeberl C. & Zoback M. D. (2007). Continental Scientific Drilling: A Decade of Progress, and Challenges for the Future. Springer Science & Business Media. p. 311. ISBN 978-3540687788. 
  5. Robinson H.H. (1913). U.S. Geological Survey Professional Paper 76. U.S. Government Printing Office. p. 109. 
  6. 6.0 6.1 6.2 Rogers, Nick; Stephen Blake; Kevin Burton; Mike Widdowson; Ian Parkinson; Nigel Harris (2008). An introduction to our dynamic planet (Co-published ed.). Cambridge: Cambridge Univ. Press. ISBN 978-0521494243. 
  7. State Geologist, Vermont (1918). Report of the State Geologist, Volume 11. pp. 191. 
  8. Middlemost E. A. K. (1985). Magmas and magmatic rocks: an introduction to igneous petrology. Longman. p. 89. ISBN 978-0582300804. 
  9. Maier W.D., Lahtinen R. & O'Brien H. (2015). Minerals Deposits of Finland. Elsevier. p. 302. ISBN 978-0124104761. 
  10. Glikson A.Y. (2014). The Archaean: Geological and Geochemical Windows into the Early Earth. Springer. p. 75. ISBN 978-3319079080. 
  11. Gill R. (2010). Igneous Rocks and Processes: A Practical Guide. John Wiley & Sons. p. 328. ISBN 978-1444330656. 
  12. Oftedahl C. (1989). Sövite. 544–545. doi:10.1007/0-387-30845-8_231. ISBN 978-0-442-20623-9. 
  13. Dunning G. R. & Grenne T. (2000). "U-Pb age dating and paleotectonic significance of trondhjemite from the type locality in the Central Norwegian Caledonides". Norges Geologiske Undersøkelse Bulletin 437: 57–65. 
  14. Senning, Alexander (2019). The Etymology of Chemical Names: Tradition and Convenience vs. Rationality in Chemical Nomenclature. Berlin: De Gruyter. p. 391. ISBN 978-3-11-061271-4. 
  15. Temple Butte Limestone, USGS