October Geology and GSA Today media ...(Mazon Creek biota of Illinois (slightly ...)

Date:9/25/2007

Mazon Creek biota of Illinois (slightly more than 300 million years old), their position in the geological record helps to fill an important gap in our knowledge of soft-bodied fossils.

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Multiple generations of interglacial lake sediment preserved beneath the Laurentide Ice Sheet
J.P. Briner, University at Buffalo, Department of Geology, 876 NSC, Buffalo, New York 14260, USA; et al. pages 887-890.

Global warming is a reaction of Earths climate system to anthropogenic greenhouse gasses emitted throughout the industrial era. The amount and pattern of future climate change, and the complex set of interactions between Earths natural systems (for example, oceans, biosphere, and ice sheets) are not well understood. Paleoclimate studies are important sources of information about our planet prior to the industrial era. Paleoclimate studies tell us what the relationship is between greenhouse gas concentrations in the atmosphere and global temperature, provide information on how different earth systems are connected, and determine how rapid climate and biological changes can occur under natural conditions. Because the Arctic plays a critical role in the global climate system,as it has the capability to amplify global warming, paleoclimate studies are of particular importance. One key source of paleoclimate information is the variety of climate change indicators preserved in lake sediments, which are deposited through time much like the layers in ice cores. However, long lake sediment records are rare in the Arctic because ice sheets during the last Ice Age (10,000 years ago) scooped out most lake basins or otherwise altered previously existing lakes. Briner et al. have made a unique discovery of an arctic lake containing sediments that span the last 200,000 years. The finding demonstrates that in settings where ice sheets preserved the underlying terraina situation in the Arctic that is not as rare as it once was thoughtvaluable record
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Contact: Ann Cairns acairns@geosociety.org 303-357-1056 Geological Society of America Source:Eurekalert

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