Increased Erosion Rates Following the Onset of Pleistocene Periglaciation at Bear Meadows, Pennsylvania, USA

Direct measurements of erosional response to past climate change are scarce, but mid-latitude landscapes can record how shifts between cold and warm periods altered erosion outside glacial margins. To study hillslope responses to periglaciation, we measured bulk geochemistry and cosmogenic 10Be and 26Al concentrations in colluvium and weathered bedrock in an 18 m regolith core from Bear Meadows, Pennsylvania, ∼100 km south of maximum glacial extent. Using core lithology, cosmogenic nuclide concentrations, and regional 10Be-derived erosion rates, we show the onset of 100-Kyr glacial cycles at the Mid-Pleistocene Transition (1.2–0.7 Ma) instigated multiple periglacial episodes in central Appalachia, increasing erosion rates compared to the relatively warmer Neogene. Our results show the higher efficiency of periglacial versus temperate erosion processes and highlight a pervasive Pleistocene periglacial erosion signal preserved in the 10Be inventory of surface sediments in central Appalachia, where erosion rates are slow enough to integrate previous cold-climate processes.

An edited version of this paper was published by AGU. Copyright 2022 American Geophysical Union [Increased Erosion Rates Following the Onset of Pleistocene Periglaciation at Bear Meadows, Pennsylvania, USA. Geophysical Research Letters 49, 4 (2022)]

Files

Metadata

Work Title Increased Erosion Rates Following the Onset of Pleistocene Periglaciation at Bear Meadows, Pennsylvania, USA
Access
Open Access
Creators
  1. J. Del Vecchio
  2. R. A. DiBiase
  3. L. B. Corbett
  4. P. R. Bierman
  5. M. W. Caffee
  6. S. J. Ivory
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Geophysical Research Letters
Publication Date January 28, 2022
Publisher Identifier (DOI)
  1. https://doi.org/10.1029/2021GL096739
Deposited February 17, 2023

Versions

Analytics

Collections

This resource is currently not in any collection.

Work History

Version 1
published

  • Created
  • Added Del_Vecchio_et_al._2022_GRL_preprint.pdf
  • Added Creator J. Del Vecchio
  • Added Creator R. A. DiBiase
  • Added Creator L. B. Corbett
  • Added Creator P. R. Bierman
  • Added Creator M. W. Caffee
  • Added Creator S. J. Ivory
  • Published
  • Updated Publication Date Show Changes
    Publication Date
    • 2022-02-28
    • 2022-01-28