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Chronology of Missoula Flood Deposits at the Coyote Canyon Mammoth Site, Washington State, USA

1
Mid-Columbia Basin Old Natural Education Sciences (MCBONES) Research Center Foundation, Kennewick, WA 99338, USA
2
School of the Environment, Washington State University—Tri-Cities, Richland, WA 99354, USA
3
Department of Geosciences, Utah State University, Logan, UT 84322, USA
*
Author to whom correspondence should be addressed.
Academic Editor: David Bridgland
Quaternary 2021, 4(3), 20; https://doi.org/10.3390/quat4030020
Received: 27 April 2021 / Revised: 25 June 2021 / Accepted: 29 June 2021 / Published: 6 July 2021
Late Pleistocene outburst megafloods, mostly from glacial Lake Missoula, hydraulically ponded behind downstream constrictions in the Columbia River in southeastern Washington State, USA. Optically stimulated luminescence (OSL) ages for flood deposits from the Coyote Canyon Mammoth Site, located in a high (315–320 m asl) distal portion of the transient lake, indicate that at least seven floods ponded high enough to inundate the area during the period 20.9 ± 2.6 ka to 16.3 ± 2.8 ka. This is consistent with a radiocarbon age of about 17.4 ± 0.2 ka cal BP from the middle of the flood sequence. OSL ages from loess deposits overlying a paleosol at the top of the flood sequence range from 14.0 ± 2.3 ka to 10.9 ± 2.0 ka, suggesting a hiatus of about 2.3 thousand years. These datasets are consistent with current understanding that multiple late Pleistocene megafloods occurred between 20 ka and 14 ka and that earlier floods produced higher flood stages than later ones. The lack of flood deposits in the Coyote Canyon area younger than 16 ka supports the hypothesis that younger megafloods did not hydraulically pond in the Pasco Basin above about 230 m asl. View Full-Text
Keywords: Missoula floods; Lake Lewis; ice age floods; mammoth; Mammuthus; OSL; geochronology; late Pleistocene Missoula floods; Lake Lewis; ice age floods; mammoth; Mammuthus; OSL; geochronology; late Pleistocene
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MDPI and ACS Style

Last, G.V.; Rittenour, T.M. Chronology of Missoula Flood Deposits at the Coyote Canyon Mammoth Site, Washington State, USA. Quaternary 2021, 4, 20. https://doi.org/10.3390/quat4030020

AMA Style

Last GV, Rittenour TM. Chronology of Missoula Flood Deposits at the Coyote Canyon Mammoth Site, Washington State, USA. Quaternary. 2021; 4(3):20. https://doi.org/10.3390/quat4030020

Chicago/Turabian Style

Last, George V., and Tammy M. Rittenour 2021. "Chronology of Missoula Flood Deposits at the Coyote Canyon Mammoth Site, Washington State, USA" Quaternary 4, no. 3: 20. https://doi.org/10.3390/quat4030020

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