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

eologic record as intact structures. Some minerals in impact-shocked rocks preserve a diagnostic microstructural record of impact deformation at the grain-scale, and survive as sand grains in sediment long after the impact structure erodes. Here, Olivia Thomson and colleagues report the occurrence of detrital shocked zircons and quartz in modern alluvium and Holocene glacial deposits eroded from the giant 1.85 billion-year-old Sudbury impact structure in Ontario, Canada. The shocked sand grains were identified using optical and electron microscopy to identify and document high-pressure shock deformation evidence on the surfaces and interiors of individual grains. One conclusion from this study is that zircons with shock microstructures can survive the process of erosion and sedimentary transport nearly two billion years after an impact event. Detrital zircons are ubiquitous in siliciclastic rocks of all ages, which means that shocked zircons eroded from older impact structures (i.e., impacts in the Archean or Hadean) should be preserved in younger sediments.


Quasi-flexural folding of pseudo-bedding
George H. Davis, Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA. Posted online ahead of print on 13 Feb. 2014; http://dx.doi.org/10.1130/B30963.1.

This paper presents a set of observations and discoveries that author George Davis made at the Sanctuary of Zeus archaeological site in Arcadia, Greece. The sanctuary contains a beautifully exposed and highly folded limestone formation of Cretaceous age. Though superficially the folding appears to be standard layer flexure in response to tectonic stress, Davis recognized that the mechanism of the folding is a hybrid never before fully recognized or documented. Standard layer flexure was prohibited because the apparent bedding in the limestone is not bedding at all, but rather "pseudo-bedding" tha
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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