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GSA Bulletin: Rock avalanches, ancient weather, astronomical clocks, anoxia, and volcanism
Date:4/4/2014

Italy
Alessandra Di Domenica et al., Dipartimento di Ingegneria e Geologia, Universit degli Studi "G. d'Annunzio" Chieti-Pescara, Campus Universitario Madonna delle Piane, Via dei Vestini, 31-66013 Chieti Scalo (CH), Italy. Published online 20 Mar. 2014; http://dx.doi.org/10.1130/B31001.1.

Alessandra Di Domenica and colleagues created a sandbox experiment to test the influence of preexisting discontinuities on foreland fold-and-thrust systems development. The model provide innovative results concerning the development of a chain, in terms of thrusts geometry and tectonic styles, highlighting the role exerted by coexisting differently oriented inherited faults. The experimental setup design was based on field data and observations collected in the Central-Northern Apennine chain (Italy).


Multiproxy approach reveals evidence of highly variable paleoprecipitation in the Upper Jurassic Morrison Formation (western United States)
Timothy S. Myers et al., Roy M. Huffington Dept. of Earth Sciences, Southern Methodist University, Dallas, Texas 75275, USA. Published online 20 Mar. 2014; http://dx.doi.org/10.1130/B30941.1.

Geochemical analyses of ancient soils in the western United States provide estimates of rainfall and humidity during deposition of the Morrison Formation in the Late Jurassic, approximately 150 million years ago. Weathering indices, used as proxies for rainfall, indicate that precipitation was highly variable within the Morrison depositional basin, with estimates ranging from 50 to 1200 mm per year and averages around 800 mm per year. These estimates of ancient precipitation indicate that aridity decreased over time, and there was an abrupt transition from relatively dry southern environments to wetter northern environments. Humidity regimes inferred from geochemical proxies ra
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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GSA Bulletin: Rock avalanches, ancient weather, astronomical clocks, anoxia, and volcanism
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