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Holocene Vegetation History of the Okanogan Valley, Washington

Published online by Cambridge University Press:  20 January 2017

Richard N. Mack ,
N.W. Rutter  and
S. Valastro
Richard N. Mack
Affiliation:
Department of Botany, Washington State University, Pullman, Washington 99164
N.W. Rutter
Affiliation:
Department of Geology, University of Alberta, Edmonton, Alberta, Canada T6G 2E1
S. Valastro
Affiliation:
Balcones Research Center, University of Texas, Austin, Texas 78757
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Abstract

Haploxylon pine(s) and Artemisia dominated the initial vegetation in front of the receding Okanogan Lobe until ca. 10,000 yr B.P., as revealed by two pollen records in north-central Washington. After 10,000 yr B.P. the macroclimate became warmer throughout the Okanogan drainage as diploxylon pines and Artemisia increased. The Mount Mazama eruption at ca. 6700 yr B.P. is recorded as two stratigraphically separate and petrographically distinct tephra units at Bonaparte Meadows. While there are apparent short-term changes in the vegetation coincident with the ashfall(s), Artemisia continues to dominate the Okanogan Valley until ca. 5000 yr B.P. By 4700 yr B.P. the modern vegetation, dominated by Pseudotsuga menziesii, had become established around Bonaparte Meadows.

Type
Research Article
Information
Quaternary Research , Volume 12 , Issue 2 , September 1979 , pp. 212 - 225
Copyright
University of Washington

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