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Geosphere: How geology, technology, modeling, and mapping see into Earth's past and present
Date:7/17/2012

el that documents diachronous volcanism and basin development along the northern Pacific margin in response to progressive insertion of the Yakutat terrane into the arcuate continental margin of southeastern Alaska.


Magnitudes and spatial patterns of erosional exhumation in the Sevier hinterland, eastern Nevada and western Utah: Insights from a Paleogene paleogeologic map
Sean P. Long, Nevada Bureau of Mines and Geology, University of Nevada, Reno, Nevada, 89557, USA. Posted online 16 July 2012; doi: 10.1130/GES783.1.

Extension of the crust in the Basin and Range province has complexly overprinted the hinterland of the Sevier fold-thrust belt in Nevada and Utah, which is a region often interpreted as an ancient, high-elevation orogenic plateau. In this paper, Sean P. Long has constructed a paleogeologic map of this region that shows the distribution of rocks and structures that were at the surface between 25 and 45 million years ago, and therefore offers a simplified view of the bedrock geology prior to the majority of Basin and Range extension. In addition, using records of thickness patterns of sedimentary rocks that once overlay this region, Long presents an additional map that shows the amount of rock that was eroded off of the Sevier hinterland prior to extension. These paleogeologic and erosion maps greatly aid in our understanding of the geometry and distribution of thrust faults and folds in the Sevier hinterland, the erosion processes that operate in high-elevation orogenic plateaus, and the timing of the subsequent extensional collapse of this region.


Transtensional deformation and structural control of contiguous but independent magmatic systems: Mono-Inyo Craters, Mammoth Mountain, and Long Valley Caldera, California
P. Riley et al., ExxonMobil Production Company, 800 Bell Street, Houston, Texas 77002, USA. Posted online 16 July 2012; doi: 10.1130/GES00662.1.

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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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