Boulder, Colo., USA In Geology: researchers experience an earthquake while studying the Atacama's rubbing boulders; information from fossil mammals, such as tooth crown height, is used to track aridity patterns; calibration of the plant transpiration of an ancient terrestrial ecosystem is presented; researchers chronicle the discovery of a new chain of barrier islands in one the highest wave-energy environments on Earth; and a change in volcanic behavior at Pisciarelli, Campi Flegrei, Italy, comes to light.
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Periglacial weathering and headwall erosion in cirque glacier bergschrunds
Johnny W. Sanders et al., Dept. of Earth and Planetary Science, University of California, Berkeley, California 94720, USA. Posted online 18 July 2012; doi: 10.1130/G33330.1.
Headwall retreat in cirques is a principal mechanism driving cirque expansion and topographic evolution near range divides. Until now, several hypotheses have been put forward to explain how cirque glaciers undermine their headwall, but the field evidence necessary to test these models has remained elusi
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