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Late Quaternary Vegetation and Climatic History of the Long Valley Area, West-Central Idaho, U.S.A.

Published online by Cambridge University Press:  20 January 2017

James P. Doerner  and
Paul E. Carrara
James P. Doerner
Affiliation:
Department of Geography, University of Northern Colorado, Greeley, Colorado, 80639
Paul E. Carrara
Affiliation:
U.S. Geological Survey, Mail Stop 913, Denver Federal Center, Denver, Colorado, 80225
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Abstract

Paleoenvironmental data, including pollen and sediment analyses, radiocarbon ages, and tephra identifications of a core recovered from a fen, provide a ca. 16,500 14C yr B.P. record of late Quaternary vegetation and climate change in the Long Valley area of west-central Idaho. The fen was deglaciated prior to ca. 16,500 14C yr B.P., after which the pollen rain was dominated by Artemisia, suggesting that a cold, dry climate prevailed until ca. 12,200 14C yr B.P. From ca. 12,200 to 9750 14C yr B.P. temperatures gradually increased and a cool, moist climate similar to the present prevailed. During this period a closed spruce–pine forest surrounded the fen. This cool, moist climate was briefly interrupted by a dry and/or cold interval between ca. 10,800 and 10,400 14C yr B.P. that may be related to the Younger Dryas climatic oscillation. From ca. 9750 to 3200 14C yr B.P. the regional climate was significantly warmer and drier than at present and an open pine forest dominated the area around the fen. Maximum aridity occurred after the deposition of the Mazama tephra (ca. 6730 14C yr B.P.). After 3200 14C yr B.P. regional cooling brought cool, moist conditions to the area; the establishment of the modern montane forest around the fen and present-day cool and moist climate began at ca. 2000 14C yr B.P.

Keywords

Idahopollen analysisdeglaciationlate-Quaternary
Type
Research Article
Information
Quaternary Research , Volume 56 , Issue 1 , July 2001 , pp. 103 - 111
Copyright
University of Washington

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