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Laramie Range at Morton Pass, Wyoming.  Paleoproterozoic (ca. 2 bya) mafic dikes (dark) cross-cut an older Archean (ca. 2.7+ bya) granitic/gneissic complex (light). ...

Laramie Range at Morton Pass, Wyoming. Paleoproterozoic (ca. 2 bya) mafic dikes (dark) cross-cut an older Archean (ca. 2.7+ bya) granitic/gneissic complex (light). ...

Étretat, France - the 80-mile stretch of sheer cliffs between Dieppe and Etretat, in upper Normandy, is mirrored by those of the English coast of Dover, pointing to their shared geological origin.

Étretat, France - the 80-mile stretch of sheer cliffs between Dieppe and Etretat, in upper Normandy, is mirrored by those of the English coast of Dover, pointing to their shared geological origin.

Beinn Alligin, Scotland   Beinn Eighe is unusual amongst the Torridon mountains in that its summit is not composed of Precambrian Torridonian Sandstone, but Cambrian basal quartzite, a very hard but brittle rock. This gives it its familiar light coloured summits, a notable contrast to the other peaks in the area. Underlying the quartzite is a bed of Torridonian Sandstone.

Beinn Alligin, Scotland Beinn Eighe is unusual amongst the Torridon mountains in that its summit is not composed of Precambrian Torridonian Sandstone, but Cambrian basal quartzite, a very hard but brittle rock. This gives it its familiar light coloured summits, a notable contrast to the other peaks in the area. Underlying the quartzite is a bed of Torridonian Sandstone.

Bob Gooday on Twitter: "Dolerite dyke from Arran for today's #ThinSectionThursday. Large feldspar at the top may have snuck in from elsewhere."

Bob Gooday on

Bob Gooday on Twitter: "Dolerite dyke from Arran for today's #ThinSectionThursday. Large feldspar at the top may have snuck in from elsewhere."

Sismograma registró el Terremoto (Chilean Mw8.1 earthquake 1 April 2014) y réplicas de Chile en este momento.

EarthQuakesTime on

Sismograma registró el Terremoto (Chilean Mw8.1 earthquake 1 April 2014) y réplicas de Chile en este momento.

Mexico's Istituto Geologico Nacional, circa 1910

Andrew Alden on

Mexico's Istituto Geologico Nacional, circa 1910

AMNH on Twitter: "This week's peek into the archives shows us "the destruction of Saint Pierre, Martinique" 1902  -  http://images.library.amnh.org/digital/exhibits/show/naturesfury/volcanoes

AMNH on Twitter: "This week's peek into the archives shows us "the destruction of Saint Pierre, Martinique" 1902 - http://images.library.amnh.org/digital/exhibits/show/naturesfury/volcanoes

7 US Festivals Worth Traveling For ... photo of Albuquerque International Balloon Fiesta

7 US Festivals Worth Traveling For

7 US Festivals Worth Traveling For ... photo of Albuquerque International Balloon Fiesta

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