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Kauai, the Petrified Forest, Costa Rica, and more: New GSA Bulletin articles now online
Date:2/26/2013

rthern Fiordland. Detailed mapping, sedimentology and microfossil analysis were used to investigate the relationship between sediment deposition and Alpine fault rupture at Hokuri Creek. Repeated fault rupture involving a component of vertical movement is shown to be the most convincing mechanism for explaining the cyclical peat and silt sedimentary sequence. This article by K.J. Clark and colleagues delves into the detail of how a record of 22 earthquakes between circa AD 800 to 6000 BC was obtained. The Hokuri Creek sequence represents one of the longest continuous large earthquake records of any on-land plate boundary fault in the world. The Alpine Fault extends about 600 km along the spine of the South Island between Milford Sound and Marlborough. It last ruptured in 1717 AD producing an earthquake of approx. magnitude 8.


Paleogene postcompressional intermontane basin evolution along the frontal Cordilleran fold-and-thrust belt of southwestern Montana
Theresa M. Schwartz and Robert K. Schwartz, Geological and Environmental Sciences, Stanford University, 450 Serra Mall, Bldg. 320, Stanford, California 94305, USA. Posted online 22 Feb. 2013; http://dx.doi.org/10.1130/B30776.1.

This article by Theresa M. Schwartz and Robert K. Schwartz investigates the evolution of the Montana landscape between approximately 50 and 20 million years ago. Detailed examination of the depositional facies and provenance of the Renova Formation in southwestern Montana provides important insight into the physical processes that affected the eastern part of the North American Cordillera after it became inactive. These include the interplay between tectonism (both in the crust and deeper in the lithosphere), erosion on the surface by large river systems, and shifts in climate patterns. Ultimately, this study finds that the complex structure that was generated more than 50 million years ago
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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