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GEOLOGY speeding top science to online platform
Date:11/14/2012

arge volumes of rock debris, which is carried away by rivers and eventually fills in adjacent ocean basins. An unusually vigorous episode of such growth occurred from 53 to 40 million years ago in the northwestern United States. Over that time period, intense mountain uplifts and volcanic eruptions occurred in the Challis volcanic province in central Idaho. The Challis Mountains shed very large volumes of sediment into three large, ancient river systems, which then filled in parts of the Pacific Ocean to the west off coastal Oregon and California, as well as partially filling a major lake basin to the southeast in southwestern Wyoming. These sediments now form much of the modern Earth surface under an area of the Oregon Coast Range about 80 km wide by 300 km long from near Tillamook in the north to Coos Bay in the south and under an area of the California Coast Ranges about 50 km wide by 250 km long from near Eureka in the north to Santa Rosa in the south.


Variable history of Quaternary ice-sheet advance across the Beaufort Sea margin, Arctic Ocean

C.L. Batchelor et al., Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK. Posted online 13 November 2012; doi: 10.1130/G33669.1.

This study uses high-resolution, two-dimensional seismic reflection data, collected by ION Geophysical Corporation as part of the BeaufortSPAN East survey, to examine the seismic stratigraphy and sedimentary architecture of a 1000-km-long section of the Beaufort Sea margin. Three cross-shelf troughs, representing locations of former ice streams draining the north-west sector of the Quaternary North American Ice Sheet, are examined: the Mackenzie, Amundsen Gulf, and M'Clure Strait systems. The objectives of this work by C.L. Batchelor and colleagues are to constrain the number of ice advances through each trough, to discuss the possible timing of these events, and to examine the impact of Quaternary glaciation on the continental
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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