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The Palisades, in central Alaska, is one of the most prominent exposures of Quaternary sediments on the Yukon River. Perennially-frozen silt and sand at the Palisades are presently thought to preserve paleoenvironmental records from the Holocene to ∼Marine Isotope Stage (MIS) 8 and, beneath a major unconformity, the earliest Pleistocene (∼2 Ma). We present new paleomagnetic and tephrochronologic constraints...
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