December GEOLOGY and GSA TODAY media ...(iences 1040 E. Fourth St. Tucson Arizona...)
iences, 1040 E. Fourth St., Tucson, Arizona 85721, USA. Pages 1067-1070.
Geologists have long been interested in how hill slopes erode. In this paper, Pelletier and Cline use field observations and computer modeling of cinder cones to determine the precise relationship between sediment flux and slope steepness. Cinder cones allow this complex relationship to be unraveled because their initial shapes are known at precise times in the geologic past.
Tethyan oceanic currents and climate gradients 300 m.y. ago
Lucia Angiolini et al., Universit degli Studi di Milano, Scienze della Terra A. Desio, Milano 20133, Italy. Pages 1071-1074.
Plants and animals adapt to the particular climatic conditions of an area and thus uniquely represent their habitat. Hence, the best tools to reconstruct past climate conditions are fossils. However, because of continental drift, the distribution of fossils must be associated with independent palaeolatitude estimates provided by palaeomagnetism. By adopting a multidisciplinary approach, Angiolini et al. reconstruct the oceanic circulation pattern of the Tethys Ocean 300 million years ago. A warm sea-surface gyre extended towards the southern tropics, but it was narrower than in modern times because it was delimited to the south by cold currents sweeping along the glaciated Gondwanan margin.
Effects of Arctic freshwater forcing on thermohaline circulation during the Pleistocene
Jochen Knies et al., Geological Survey of Norway, Surficial Deposits, Trondheim, Trndelag 7491, Norway. Pages 1075-1078.
Knies et al.'s study from the Arctic Ocean highlights the impact of Arctic freshwater on the thermohaline circulation during the Pleistocene. The authors show that freshwater plumes released from collapsing circum-Arctic ice sheets reached the northern North Atlantic several times over the past 0.8 million years. As a consequence, the production of North Atlantic deep w
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| Contact: Ann Cairns acairns@geosociety.org 303-357-1056 Geological Society of America Source:Eurekalert |
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