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Holocene depositional history inferred from single-grain luminescence ages in southern California, North America.
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  • Sourav Saha,
  • Seulgi Moon,
  • Nathan D Brown,
  • Edward Rhodes,
  • Katherine M. Scharer,
  • Devin McPhillips,
  • Sally F. McGill,
  • Bryan A Castillo
Sourav Saha
University of California

Corresponding Author:sahasv07@gmail.com

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Seulgi Moon
University of California Los Angeles
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Nathan D Brown
University of California, Berkeley
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Edward Rhodes
University of Sheffield
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Katherine M. Scharer
United States Geological Survey
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Devin McPhillips
US Geological Survey
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Sally F. McGill
California State University, San Bernardino
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Bryan A Castillo
California State University, San Bernardino
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Significant sediment flux and deposition in a sedimentary system are influenced by climate changes, tectonics, lithology, and the sedimentary system’s internal dynamics. Identifying the timing of depositional periods from stratigraphic records is a first step to critically evaluating the controls of sediment flux and deposition. Here, we show that ages of single-grain K-feldspar luminescence subpopulations may provide information on the timing of previous major depositional periods. We analyzed 754 K-feldspar single-grains from 17 samples from the surface to ~9 m-depth in a trench located downstream of the Mission Creek catchment. Single-grain luminescence subpopulation ages significantly overlap at least eight times since ~12.0 ka indicating a common depositional history. These depositional periods correspond reasonably well with the wetter climate periods based on hydroclimatic proxies from nearby locations. Our findings imply a first-order climatic control on sediment depositional history in southern California on a millennial timescale.