December GEOLOGY and GSA TODAY media ... (ng the PermianTriassic crisis Shuceng ...)

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December GEOLOGY and GSA TODAY media highlights

Date:11/29/2007

ng the PermianTriassic crisis
Shuceng Xie et al., China University of Geosciencess, Key Laboratory of Biogeology and Environmental Geology, Wuhan, Hubei 430074, China. Pages 1083-1086.

Earth witnessed its most severe mass extinction 250 million years ago. This extinction has been thought to be abrupt and probably caused by an extraterrestrial impact. However, Xie et al. present several lines of geochemical evidence from a South China section (an optimal section to study the biotic crisis) that indicates a two-episodic global change in association with the ecological crisis. The global carbon cycle, the enhanced terrestrial weathering, the marine photic zone euxinia, the faunal mass extinction, and the cyanobacterial expansion all occurred as two episodes, showing a close coupling among the ocean, the atmosphere, and the land system at that time. In particular, Xie et al. found that the first episode occurred before the presumed bolide impact. The temporal sequence of these two events suggests that the biotic crisis was a consequence of prolonged and episodic changes in the marine and continental systems, and argues against an extraterrestrial impact as the main cause.

Orbital rhythms, monsoons, and playa lake response, Olduvai Basin, equatorial East Africa (ca. 1.851.74 Ma)
Gail Ashley, Rutgers, The State University of New Jersey, Geological Sciences, 610 Taylor Road, Piscataway, New Jersey 08854-8066, USA. Pages 1091-1094.

Early humans evolved in Africa during times of increasing aridity and climate variability. Olduvai Gorge, Tanzania (near the equator) has been an important site for human origin research since its discovery in the 1930s. The Gorge exposes a 100,000-year-long record at the Plio-Pleistocene boundary that contains a rich vertebrate fossil record, two species of hominins, thousands of stone tools, and a detailed paleoenvironmental record. Ashleys recent geological studies of Olduvai Basin reveale
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Contact: Ann Cairns
acairns@geosociety.org
303-357-1056
Geological Society of America
Source:Eurekalert

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December GEOLOGY and GSA TODAY media ...(ng the PermianTriassic crisis Shuceng ...)