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Geology's 'Mystery Interval,' the 'Great Deepening,' and the largest kill-off in Earth history
Date:8/23/2012
voluci Social), c/Escorxador s/n, 43003 Tarragona, Spain, and rea de Prehistria, Universitat Rovira i Virgili (URV), Avinguda de Catalunya 35, 43002 Tarragona, Spain. Posted online ahead of print 22 Aug. 2012; doi: 10.1130/G33427.1.
Investigating how climate has changed in the past (in particular how hot were the warm periods of the Quaternary) may help us to understand how it may change in the future and its consequences on temperature and water resources. In the Mediterranean area, which is climatically stressed by limited water resources and extremes of heat, climate variations are known to play a crucial role in the ecosystems and environment. The Gran Dolina sequence (Sierra de Atapuerca, north-central Spain) provides a unique, long paleontological and archaeological record that documents the evolution of north Iberian ecosystems during the last million years. A fossil amphibian and reptile-based reconstruction of temperature and precipitation shows marked peaks that have been related to various interglacial peaks in accordance with numeric dates, and paleomagnetic and biochronological data. An analysis of the successive interglacial periods of the last million years has revealed that interglacials become warmer and drier after about 450 thousand years ago, and most of them were warmer than present day. As a result, climate trend in the Mediterranean area is found to be congruous with global climate changes as reconstructed from ice and sea surface temperature records over the last million years.
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| Contact: Kea Giles kgiles@geosociety.org Geological Society of America Source:Eurekalert |
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