Chronology and ecology of late Pleistocene megafauna in the northern Willamette Valley, Oregon

Daniel M. Gilmour, Virginia L. Butler, Jim E. O'Connor, Edward Byrd Davis, Brendan James Culleton, Douglas James Kennett, Gregory Hodgins

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Since the mid-19th century, western Oregon's Willamette Valley has been a source of remains from a wide variety of extinct megafauna. Few of these have been previously described or dated, but new chronologic and isotopic analyses in conjunction with updated evaluations of stratigraphic context provide substantial new information on the species present, timing of losses, and paleoenvironmental conditions. Using subfossil material from the northern valley, we use AMS radiocarbon dating, stable isotope (δ13C and δ15N) analyses, and taxonomic dietary specialization and habitat preferences to reconstruct environments and to develop a local chronology of events that we then compare with continental and regional archaeological and paleoenvironmental data. Analysis of twelve bone specimens demonstrates the presence of bison, mammoth, horse, sloth, and mastodon from ~15,000-13,000calyrBP. The latest ages coincide with changing regional climate corresponding to the onset of the Younger Dryas. It is suggested that cooling conditions led to increased forest cover, and, along with river aggradation, reduced the area of preferred habitat for the larger bodied herbivores, which contributed to the demise of local megafauna. Archaeological evidence for megafauna-human interactions in the Pacific Northwest is scarce, limiting our ability to address the human role in causing extinction.

Original languageEnglish (US)
Pages (from-to)127-136
Number of pages10
JournalQuaternary Research (United States)
Volume83
Issue number1
DOIs
StatePublished - Jan 1 2015

Fingerprint

chronology
Pleistocene
ecology
valley
archaeological evidence
subfossil
aggradation
Younger Dryas
accelerator mass spectrometry
radiocarbon dating
horse
forest cover
habitat selection
regional climate
bone
herbivore
stable isotope
extinction
cooling
habitat

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Earth-Surface Processes
  • Earth and Planetary Sciences(all)

Cite this

Gilmour, Daniel M. ; Butler, Virginia L. ; O'Connor, Jim E. ; Davis, Edward Byrd ; Culleton, Brendan James ; Kennett, Douglas James ; Hodgins, Gregory. / Chronology and ecology of late Pleistocene megafauna in the northern Willamette Valley, Oregon. In: Quaternary Research (United States). 2015 ; Vol. 83, No. 1. pp. 127-136.
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Chronology and ecology of late Pleistocene megafauna in the northern Willamette Valley, Oregon. / Gilmour, Daniel M.; Butler, Virginia L.; O'Connor, Jim E.; Davis, Edward Byrd; Culleton, Brendan James; Kennett, Douglas James; Hodgins, Gregory.

In: Quaternary Research (United States), Vol. 83, No. 1, 01.01.2015, p. 127-136.

Research output: Contribution to journalArticle

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