Field trip guide for the International Field Conference and Workshop on Tephrochronology & Volcanism, Dawson City, Yukon Territory, Canada, July 31st - August 8th, 2005

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Froese, D.G.; Westgate, J.A.; Alloway, B.V. (eds) 2005 Field trip guide for the International Field Conference and Workshop on Tephrochronology & Volcanism, Dawson City, Yukon Territory, Canada, July 31st - August 8th, 2005 . Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2005/26 132 p.

Abstract: The last decade has seen a resurgence in studies of the rich Plio-Pleistocene record preserved in central and western Yukon Territory. The exceptional exposure of Plio-Pleistocene deposits by Yukon placer miners in the Klondike, and the application of new dating methods (palaeomagnetism, tephrochronology – including fission track and Ar-Ar dating) along with soil-stratigraphic and sedimentologic data, and the diligent efforts of palaeoecologists have led to a more accurate and precise understanding of this region’s Ice Age history. These studies, by their nature, are interdisciplinary and this field trip will highlight these connections in the developing story of the evolution of environments in this region over the last three million years. The trip will start in Whitehorse and proceed along a transect from the most recent glacial deposits of southern Yukon through progressively older terrain, into the unglaciated region of west-central Yukon. The trip from Whitehorse to Dawson crosses the McConnell (late Wisconsin), Reid (mid-Pleistocene) and pre-Reid (multiple late Pliocene-early Pleistocene) drift surfaces, entering into the unglaciated region of central Yukon Territory. The field excursion on the final day of the conference introduces the rich glacial record of the Klondike goldfields and the late Pleistocene environments associated with the Mammoth steppe in Yukon Territory. This field-trip guide is organised into three sections. The first section is a series of background summaries on climate, permafrost, regional Quaternary history, palaeoecology, palaeofauna, soils, tephrochronology and placer gold deposits. These are intended to provide a more complete context for the individual stops. This section is followed by another two which provide specific information on stops scheduled to be visited during the Whitehorse-Dawson (Stops 1-6; August 1st) and Klondike Goldfield (Stops 7-15, August 5th & 6th) field excursions. (auth)