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Geology
Volcanism
Added: 3-3-2008
Last modified: 11-2-2014 by webmaster
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Geology
Category: Volcanism

Comments:
The Massif Central in central France is known for its volcanic activity. When lava flows cool slowly, they can crystallize. In Bort-les-Orgues (Limousin) pillars of meters long Phonolite occurs. Phonolite is (between mafic and felsic) volcanic rock containing predominantly potassium Feldspar, and more than10% Nepheline. This rock occurs in areas with alkali-rich volcanism. Because of its location in a river valley, these formations have not been lost through erosion.

Locatie
Photographed in: Bort-les-Orgues, France
Date: 2007

Photo data
By Erik Sanderson (zoekozoeko)
Fossiel.net number: 739-0001

 
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