AN EARLY HOLOCENE COLD CLIMATIC EPISODE IN EASTERN IDAHO |
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| Authors: | David R Butler |
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| Institution: | Department of Geography , Oklahoma State University , Stillwater, OK 74078 |
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| Abstract: | Glacial, periglacial, and palynologic evidence from a small valley in the Lemhi Mountains of eastern Idaho indicates that an early Holocene cold climatic episode occurred there approximately 8,000 years ago. A small glacial moraine marks the farthest downvalley point of advance during a previously unrecognized glacial stade in the area. Periglacial ice wedges and involutions are preserved in buried sediments deposited during this same time. Pollen data extracted from these sediments suggest that an alpine steppe/tundra characterized the vegetational response to this period of early Holocene cold conditions. Other evidence from studies on the eastern Snake River Plain of Idaho corroborates these interpretations, suggesting a climatic reversal of regional importance. |
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| Keywords: | monsoon moisture surge Gulf of California Arizona |
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