Increased erosion rates following the onset of Pleistocene periglaciation at Bear Meadows, Pennsylvania, USA
Direct measurements of erosion response to past climate change are scarce, but mid-latitude landscapes enable studying how cold periods altered erosion processes and rates beyond glacial margins. To determine hillslope responses to periglaciation, we measured bulk geochemistry and cosmogenic 10Be and 26Al concentrations in colluvium and weathered bedrock from an 18 m core from Bear Meadows, Pennsylvania, ~100 km south of maximum glacial extent. Using core lithology, cosmogenic nuclide concentrations, and regional 10Be erosion rates, we show that the onset of 100-kyr glacial cycles at the Mid-Pleistocene Transition (1.2–0.7 Ma) instigated multiple periglacial episodes in central Appalachia and a sustained increase in erosion rates compared to the relatively warmer Neogene. Our results show the relative efficiency of periglacial versus temperate erosion processes and highlight the pervasive Pleistocene periglacial erosion signature preserved in the 10Be inventory of surface sediments in the slowly eroding landscapes of the Mid-Atlantic USA
|Work Title||Increased erosion rates following the onset of Pleistocene periglaciation at Bear Meadows, Pennsylvania, USA|
|License||CC0 1.0 (Public Domain Dedication)|
|Publication Date||August 2021|
|Deposited||September 03, 2021|
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