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Rubbing boulders, fossil mammal teeth, barrier islands, and a change in volcanic behavior
Date:7/24/2012

nologic techniques plus detailed geomorphic and geologic mapping allowed them to produce strong evidence for an atmospheric cooling in south Patagonia throughout the Antarctic cold reversal chronozone (ACR; about 14.6-12.9 thousand years ago). This work shows that ice in the southern mid-latitudes expanded and actively built prominent moraine systems not only at the end of the ACR, but throughout this stadial, interrupting the last deglacial warming trend. Concurrent intensive westerly circulation in the region brought cold and wetter conditions to Torres del Paine, triggering glacial expansion. For the first time, work dating glacial fluctuations strongly demonstrates that the late-glacial southern criosphere responded closely to changes in the atmosphere and ocean throughout the ACR, providing another piece of evidence for paleoclimate teleconnections at the southern part of the planet during the last glacial termination.


How steady are steady-state landscapes? Using visible-near-infrared soil spectroscopy to quantify erosional variability

Kristin E. Sweeney et al., Dept. of Geological Sciences, University of Oregon, Eugene, Oregon 97403, USA. Posted online 23 July 2012; doi: 10.1130/G33167.1.

Erosion rates enable scientists to infer how landscapes respond to climate and tectonics through time. However, most methods for measuring erosion rates are quite costly, limiting the number of samples per study. Kristin E. Sweeney and colleagues present a new, inexpensive method for measuring relative erosion rates, which uses visual/near infrared spectroscopy to infer the residence time of hilltop soils. Soil residence time is directly linked to erosion rate: longer residence times indicate slower erosion rates. Results from two study watersheds in the Oregon Coast Range suggest that this method can capture both the natural unsteadiness of hillslope erosion and larger landscape dynamics such as divide migration.



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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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