Journal
QUATERNARY RESEARCH
Volume 63, Issue 2, Pages 189-198Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.yqres.2004.11.003
Keywords
Beringia; Pleistocene; plant macrofossils; Spermophilus parryii; microtine rodents; herbivory; pennafrost; loess; palcoecology
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Rodent middens from ice-rich loess deposits are important new paleoenvironmental archives for Eastern Beringia. Plant macrofossils recovered from three middens associated with Dawson tephra (ca. 24,000 C-14 yr B.P.) at two sites in Yukon Territory include diverse graminoids, forbs, and mosses. These data suggest substantial local scale floristic and habitat diversity in valley settings, including steppe-tundra on well-drained soils, moist streamside meadows, and hydric habitats. Fossil arctic ground squirrel burrows and nesting sites indicate that permafrost active layers were thicker during Pleistocene glacial periods than at present on north-facing slopes. (c) 2004 University of Washington. All rights reserved.
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