October Geology and GSA Today media ...(s of paleoclimate exist. Evidence...)

Date:9/25/2007

s of paleoclimate exist.

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Evidence for a rapid sea-level rise 7600 yr ago

Shi-Yong Yu, Large Lakes Observatory, Univiversity of Minnesota, Duluth, Minnesota 55812, USA; et al. Pages 891-894.

Dating the transgression and subsequent regression in marginal basins of the southeastern Swedish Baltic Sea provides a new perspective of global ice-volume changes and the isostatic adjustment of the mantle after the retreat of the Scandinavian Ice Sheet. Yu et al. attribute a rapid local sea-level rise of roughly 4.5 meters ca. 7600 calibrated (cal) years before present to a sudden increase in ocean mass, most likely caused by the final decay of the Labrador sector of the Laurentide Ice Sheet. This finding suggests that land-based ice sheets can melt relatively quickly, and thus more attention should be given to the Greenland Ice Sheet when predicting future sea level, particularly within the context of global warming.

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Changes in coral-reef structure through the Miocene in the Mediterranean province: Adaptive versus environmental influence
Luis Pomar, Universitat de les Illes Balears, Ciencies de la Terra, Ctra. Valldemossa, km 7.5, Palma de Mallorca, Baleares/Espaa E-07122, Spain; and Pamela Hallock, University of South Florida, College of Marine Science, 140 7th Avenue South, St. Petersburg, Florida 33701, USA. Pages 899-902.

Both global climate change and the worldwide decline of reef-building coral populations now make the news on a regular basis. Well-constrained studies of fossil reef communities during times of environmental change can provide invaluable insights and perspective on the current situation. Pomar and Hallock examine changes in reef-building corals in the Mediterranean approximately 6.57 million years ago. These changes took place during a time of global cooling, and also correspond with recently documented diversification of the symbiotic zooxanthellae (algae) that shallow-wa
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Contact: Ann Cairns acairns@geosociety.org 303-357-1056 Geological Society of America Source:Eurekalert

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