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Ancient whale coprolites, fault slickensides, shergottites, Ediacara, and Cascadia
Date:7/31/2013

ort laboratory experiments that reproduce these seemingly contradictory observations and also offer a means to infer pyroclastic flow velocity. Experiments demonstrate that the sliding head of a granular flow generates a dynamic upward pore pressure gradient at the flow-substrate interface. Associated upward air flux is enough to fluidize a smooth substrate of fines, so that particles are not entrained individually but the substrate instead results in small shear instabilities. In contrast, coarse particles forming a non-fluidized rough substrate are lifted at a critical upward force due to the pore pressure gradient, according to their individual masses, which provides a basis for a model to calculate the flow velocity. Application to the 18 May 1980 pyroclastic flow deposits at Mount St. Helens gives velocities of about 9 to 13 meters per second at about 6 to 7 km from the vent on gentle slopes (less than 4 to 6 degrees), in agreement with field observations at this volcano and others.


A stable and hot Turonian without glacial {delta}18O excursions is indicated by exquisitely preserved Tanzanian foraminifera
Kenneth G. MacLeod et al., Department of Geological Sciences, University of Missouri, Columbia, Missouri 65211, USA. Published online ahead of print 30 July 2013, http://dx.doi.org/10.1130/G34510.1.

A shift over a few centuries from the icehouse climate state in which humans evolved to a greenhouse climate similar to that of Late Cretaceous (~100 to 65 million years ago) is an often repeated, cautionary prediction of the likely consequence of continued burning of fossil fuels and other anthropogenic additions to atmospheric CO2. The corollary, that understanding previous greenhouse times might help predict future conditions, has justified many Late Cretaceous studies. The resolution of these studies has increased to the point where temporal variability i
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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