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Mistaken point, Sanctuary of Zeus, catastrophic outburst floods, shocked sand grains
Date:2/20/2014

oclastic flows into water, whereas other beds imply underwater resedimentation, shallow-water eruptions and inter-eruptive background sedimentation.


Abrupt and high-magnitude changes in atmospheric circulation recorded in the Permian Maroon Formation, tropical Pangaea
M.J. Soreghan et al., School of Geology and Geophysics, University of Oklahoma, Norman, OK, 73019, USA. Posted online ahead of print on 3 Feb. 2014; http://dx.doi.org/10.1130/B30840.1

The formation and evolution of the Pangaean supercontinent 300 million years ago led to fundamental changes in Earth's climate. The rise of a mountain belt that straddled the equator impacted rainfall patterns around the tropics and altered atmospheric circulation. But constraining the details of past atmospheric circulation from geologic data has been challenging. In this paper, M.J. Soreghan and colleagues utilize a novel suite of sedimentologic and geochemical data to constrain how wind patterns changed over the western edge of the Pangaean supercontinent. Measuring changes in grain size, magnetic character, and provenance of sediment over a 12 m section of preserved wind-deposited silt (loess) in central Colorado, the authors show that both the magnitude and direction of winds changed repeatedly over time periods (tens and hundreds of thousands of years) similar in scale to those that have regulated glacial cycles in Earth's recent past. Fundamental changes in the magnitude and direction of winds, and attendant changes in precipitation, suggests a mega-monsoonal circulation was established by early Permian time.


Buried preglacial fluvial gorges and valleys preserved through Quaternary glaciations beneath the eastern Laurentide Ice Sheet
Patrick Lajeuesse, Centre d'tudes nordiques and Dpartement de gographie, Universit Laval, Qubec, Quebec, G1V 0A6, Canada. Posted online ahead of print o
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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