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Text Description: Sample ID SB16B-67. Tephra sample from 158 cm depth in core. In general, this tephra caps a clayey unit and is 2-3 mm thick. References:  Three Holocene tephras identified in lacustrine sediment cores from the Wonder Lake area, Denali National Park and Preserve, Alaska, USA Late Pleistocene and Holocene tephrostratigraphy of interior Alaska and Yukon: Key beds and chronologies over the past 30,000 years |
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