Pliocene and Pleistocene Volcanic Interaction with Cordilleran Ice Sheets, Damming of the Yukon River and Vertebrate Palaeontolo
Quaternary International xxx (2011) 1e18 Contents lists available at SciVerse ScienceDirect Quaternary International journal homepage: www.elsevier.com/locate/quaint Pliocene and Pleistocene volcanic interaction with Cordilleran ice sheets, damming of the Yukon River and vertebrate Palaeontology, Fort Selkirk Volcanic Group, west-central Yukon, Canada L.E. Jackson Jr. a,*, F.E. Nelsonb,1, C.A. Huscroftc, M. Villeneuved, R.W. Barendregtb, J.E. Storere, B.C. Wardf a Geological Survey of Canada, Natural Resources Canada, 625 Robson Street, Vancouver, BC V6B5J3, Canada b Department of Geography, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta T1K 3M4, Canada c Department of Geography, Thompson Rivers University, Box 3010, 900 McGill Road, Kamloops, BC V2C 5N3, Canada d Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada e 6937 Porpoise Drive, Sechelt, BC V0N 3A4, Canada f Department of Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC V2C 5N3, Canada article info abstract Article history: Neogene volcanism in the Fort Selkirk area began with eruptions in the Wolverine Creek basin ca. 4.3 Ma Available online xxx and persisted to ca. 3.0 Ma filling the ancestral Yukon River valley with at least 40 m of lava flows. Activity at the Ne Ch’e Ddhäwa eruptive center overlapped with the last stages of the Wolverine Creek eruptive centers. Hyaloclastic tuff was erupted between ca. 3.21 and 3.05 Ma. This eruption caused or was coincident with damming of Yukon River. The first demonstrable incursion of a Cordilleran ice sheet into the Fort Selkirk area was coincident with a second eruption of the Ne Ch’e Ddhäwa eruptive center ca.
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