Recessions of Lakes Lahontan and Bonneville that commenced approximately 13,500 C-14 yr B.P. were interrupted at greater-than-or-equal-to 11,500 C-14 yr B.P. in the Lahontan basin and approximately 12,200 C-14 yr B.P. in the Bonneville basin by relatively large perturbations in lake level that persisted for approximately 2000 years. Minor glacial readvances in the Sierra Nevada and White Mountains of California-Nevada occurred during the latter half of this interval (between 11,000 and 9700 C-14 yr B.P.). The hydrologic response of Lakes Lahontan and Bonneville and the mountain glacial advances were concurrent with the Allerod/Younger Dryas climatic intervals recorded in vegetational and glacial records of western and central Europe.
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