September Geology and GSA Today media ...(ibutable to post-European water quality ...)

Date:8/22/2008

ibutable to post-European water quality changes at this site. While extrapolation of these findings to other turbid-zone and inner-shelf reefs must remain tentative, the study raises important questions about the resilience of inner-shelf reefs that have been under terrestrial sediment influence and subject to elevated turbidity conditions.

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Cyrenaican "shock absorber" and associated inversion strain shadow in the collision zone of northeast Africa

William Bosworth et al., Apache Egypt Companies, 11, Street 281, New Maadi, Cairo, Egypt. Pages 695-698.

The Mediterranean Sea is closing; Europe is moving south to collide with Africa. This process began more than 80 million years ago and will take millions of years to complete. Bosworth et al. describe some of the geologic events that occurred during the beginning of this closure and how they impacted the development of sedimentary basins in northeast Africa, which affected how oil and gas were formed and trapped in the prolific Sirt basin of Libya and the Western Desert of Egypt.

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The Pangea conundrum

Brendan Murphy and R. Damian Nance, Dept. of Earth Sciences, St. Francis Xavier University, P.O. Box 5000, Antigonish, Nova Scotia, B2G 2W5, Canada. Pages 703-706.

The existence of the supercontinent Pangea, which formed about 300 million years ago and broke up about 200 million years ago, is a cornerstone of plate tectonics, and processes resulting in its assembly and fragmentation have governed the evolution of Earth's crust for 500 million years. Over the past 20 years, evidence has been amassing that Pangea is just the latest in a series of supercontinents that formed repeatedly since the Archean, only to break up and reform again. Although the mechanisms responsible are controversial, many geoscientists agree that repeated cycles of supercontinent amalgamation and dispersal have had a profound effect on the evolution of Earth's crust,
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Contact: Christa Stratton cstratton@geosociety.org 303-357-1093 Geological Society of America Source:Eurekalert

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