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October Geology and GSA Today media highlights
Date:9/25/2007

he use of Archean cherts as traces of the earliest environmental conditions of our planet.


Geodetic constraints on areal changes in the PacificNorth America plate boundary zone: What controls Basin and Range extension?
Corn Kreemer and William C. Hammond, University of Nevada, Reno, Bureau of Mines and Geology, 1664 N. Virginia Street, Reno, Nevada 89557-0178, USA. Pages 943-946.

The crustal deformation in the wide region between the Pacific and North America plates has been quantified using over 1500 published velocities inferred from global positioning system (GPS) measurements. Kreemer and Hammond have converted the deformation into estimates of present-day changes in surface area. Their study shows that between the Gulf of California and British Columbia, the entire plate boundary does not undergo any net areal change. The greater Basin and Range area, on the other hand, increases its size by over 5000 square meters per year. Kreemer and Hammond show that this areal growth is offset by an equal amount of areal reduction in the northern California Coast Ranges and Klamath Mountains. The study enforces the idea that the southern Cascadia subduction zone provides a "window of escape" for the highly elevated Basin and Range to extend toward. Such an idea is consistent with independent information about stress orientations in the Basin and Range, and anomalously low-stress magnitudes along the southern Cascadia subduction zone.


A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs
Ari Iglesias, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Divisin Paleobotnica, Paseo del Bosque s/n, La Plata, La Plata / Buenos Aires 1900, Argentina; et al. Pages 947-950.

Very little is known about the vegetation of the South American continent during the Paleocene epoch, the 10 million years following the mass extinc
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Contact: Ann Cairns
acairns@geosociety.org
303-357-1056
Geological Society of America
Source:Eurekalert

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