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External Spanish Pyrenees – Kellen Gunderson

June 10, 2013November 9, 2014 Christopher Spencer

The external Spanish Pyrenees are classic locale for geologists who want to study the interactions between sedimentation and tectonics. The Pyrenees are a fold and thrust belt resulting from the collision of Iberia and Europe. Most of the deformation of the external Pyrenees occurred during the Eocene (56-34 Million years ago). The external Pyrenees are […]

Barrovian Metamorphism in Central Spain

April 13, 2012November 9, 2014 Christopher Spencer

George Barrow (1853-1932), a self-taught field geologist discovered systematic changes in metamorphic mineral assemblages in the Scottish Highlands. He further proposed that the sequence of mineral appearances was an indication of increasing metamorphic grade or the conditions under which the rocks were metamorphosed. The mineral sequence is thus: Chlorite – Biotite – Garnet – Staurolite […]