Type locality (geology)

Type locality, also called type area, is the locality where a particular rock type, stratigraphic unit or mineral species is first identified. 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. The term is similar to the term type site in archaeology or the term type specimen in biology. Aragonite: Molina de Aragón, Guadalajara, Spain Autunite: Autun, France Benmoreite: Ben More (Mull), Scotland Blairmorite: Blairmore, Alberta, Canada Boninite: Bonin Islands, Japan Comendite: Comende, San Pietro Island, Sardinia Cummingtonite: Cummington, Massachusetts Dunite: Dun Mountain, New Zealand. Essexite: Essex County, Massachusetts, US Fayalite: Horta, Fayal Island, Azores, Portugal Harzburgite: Bad Harzburg, Germany Icelandite: Thingmuli (Þingmúli), Iceland Ijolite: Iivaara, Kuusamo, Finland Kimberlite: Kimberley, Northern Cape, South Africa Komatiite: Komati River, South Africa Labradorite: Paul's Island, Labrador, Canada Lherzolite: Étang de Lers, France (Old spelling was: Étang de Lherz.) Mimetite: Treue Freundschaft Mine, Johanngeorgenstadt, Germany Mugearite: Mugeary, Skye, Scotland Mullite: Isle of Mull, Scotland Pantellerite: Pantelleria, off Sicily Portlandite: Scawt Hill, Ballygalley, Larne, County Antrim, Northern Ireland Rodingite: Roding River, New Zealand Sovite: Norsjø, Norway Strontianite: Strontian, Scotland (also the element strontium derived from the mineral) Temagamite: Copperfields Mine, Temagami, Ontario, Canada Tilleyite: Crestmore Quarry, Riverside County, California Tonalite: Tonale Pass Trondhjemite: Follstad, Støren, Norway Uraninite: Joachimsthal, Austria-Hungary (now Jáchymov, Czech Republic) Websterite: Webster in North Carolina. Widgiemoolthalite: Widgiemooltha, Western Australia, Australia Ytterbite (a.k.a.