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Articles for Geosphere posted online in April


Boulder, Colo., USA: GSA s dynamic online journal,
Geosphere, posts articles online regularly. Locations and topics studied this month include the Central Anatolian Plateau; the Southern Rocky Mountain Volcanic Field; petrogenesis in the Grand Canyon; and the evolution of the Portland and Tualatin forearc basins, Oregon.
A physical and chemical sedimentary record of Laramide tectonic shifts in the Cretaceous-Paleogene San Juan Basin, New Mexico, USA
Kevin M. Hobbs; Peter J. Fawcett
Abstract: Fluvial siliciclastic rocks bracketing the Cretaceous-Paleogene (K-Pg) boundary in the San Juan Basin, New Mexico (USA), provide records of regional fluvial and tectonic evolution during the Laramide orogeny. Petrographic analyses of sandstones from the Upper Cretaceous Fruitland Formation and Kirtland Formation and the Paleocene Ojo Alamo Sandstone and Nacimiento Formation show that the rivers depositing these sediments were sourced in areas where unroofing of crystalline ....

United States , San Juan Basin , New Mexico , Upper Fruitland , Columbia River , Fisher Gulch , Ojo Alamo , Chiquito Peak , Carlos Fern , A Kate Souders , John Bershaw , Maudjm Meijers , Gillesy Brocard , Ashleyr Streig , Manuel Francisco Pereira , Michaela Cosca , Peterj Fawcett , Peterw Lipman , Carmen Rodriguez , Brena Thompson , Kea Giles , Antonio Castro , Amyk Gilmer , Tristan Salles , Kevinm Hobbs , Jane Willenbring ,

New Geology articles published online ahead of print in April


reconstructed from sub-ice shelf and offshore sediments
J.A. Smith; C.-D. Hillenbrand; C. Subt; B.E. Rosenheim; T. Frederichs .
Abstract:
Because ice shelves respond to climatic forcing over a range of time
scales, from years to millennia, an understanding of their long-term
history is critically needed for predicting their future evolution. We
present the first detailed reconstruction of the Larsen C Ice Shelf (LCIS),
eastern Antarctic Peninsula (AP), based on data from sediment cores
recovered from below and in front of the ice shelf. Sedimentologic and
chronologic information reveals that the grounding line (GL) of an expanded
AP ice sheet had started its retreat from the midshelf prior to 17.7 ± 0.53 ....

United States , Mount Sharp , Henrys Fork , Pacific Ridge , Columbia River , Canada General , Snake River , British Columbia , Montezuma Well , New Zealand , Snake River Plain , Death Valley , Sonoran Desert , Coast Range , Michaell Williams , Mike Mayall , Ghislain Trullenque , Atlantic Ocean , Dorothea Wiesner , Tamara Baumberger , Davidr Gaylord , Chi Yuen Wang , Gen Shimoda , Maria Giuditta , Andrew Rc Kylander Clark , Briank Horton ,