Glacial limits and flow patterns, Yukon Territory, south of 65 degrees north latitude

Hughes, O L; Campbell, R B; Müller, J.; Wheeler, J O

doi:10.4095/104733

Cited by 40 publications

(36 citation statements)

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“…The Pony Creek area has been ice-free since the last(younger) pre-Reid glaciation which is bracketed between 0.99 and 0.78 Ma (Jackson et al, 1996). At that time, glaciers, originating more than 100 km to the southeast, in higher parts of the Cordillera (Hughes et al, 1969), flowed up the Victoria Creek basin to at least the elevation of the Pony Creek drill site (Jackson, in …”

Section: Physiographic Settingmentioning

confidence: 99%

A middle Pleistocene paleosol sequence from Dawson Range, Central Yukon Territory

Jackson¹,

Tarnócai²,

Mott³

2002

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AbstractFour paleosols were intersected in a core drilled into the colluvial fill of a largely buried meltwater channel that was last active during the youngest of the pre-Reid glaciation (0.99-0.78 Ma) in the Dawson Range, Yukon Territory. The paleosols are classified as Podzols. The sedimentary sequence and paleosols indicate that at least two middle Pleistocene glacial and interglacial periods are represented in the core. The mean annual temperature exceeded 0° C for thousands of years in the upland environment of the Dawson Range at 61° N during these interglacial periods.

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Section: Physiographic Settingmentioning

confidence: 99%

A middle Pleistocene paleosol sequence from Dawson Range, Central Yukon Territory

Jackson¹,

Tarnócai²,

Mott³

2002

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“…Although other large montane glaciers in valleys such as Keele, Stone Knife Valley and its branch, a western tributary of Arctic Red Valley and its branch, left well preserved frontal moraines and loops where they bulged into lateral valleys (such as the ones in Hay Creek), none left terminal moraines as completely preserved as the moraine complex in Gayna Valley. Gayna River glacial features are similar in the degree of preservation to those of McConnell age and presumed correlatives throughout Yukon (Hughes et al, 1969 …”

Section: ) Degree Of Preservationmentioning

confidence: 67%

“…between McCauley and Mirror Creek deposits of the piedmont glacier complex of southwestern Yukon (Rampton 1971), between McConnell and Reid deposits of the Cordilleran Ice Sheet in central Yukon (Bostock, 1966: Hughes et al, 1969 and between last and intermediate glaciations in Southern Ogilvie Mountains (Vernon and Hughes, 1966) and Wernecke and Northern Ogilvie Mountains (Hughes, 1972).…”

Section: Pleistocene Glaciationsmentioning

confidence: 99%

Pleistocene Montane Glaciations in the Mackenzie Mountains, Northwest Territories

Duk-Rodkin¹,

Hughes²

2007

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During the Pleistocene the Mackenzie Mountains were affected by a series of glaciations. Through all the glaciations a single pattern seems to have been repeated: a Cordilleran ice sheet formed to the west of the continental divide and montane valley glaciers formed to the east. The montane glaciers in the Mackenzie Mountains emanated from two differents sources: a) a glacial divide, lying generally along the topographic divide between Pacific and Arctic drainage, and dividing the westerly flowing Cordilleran Ice Sheet from easterly and northerly flowing montane glaciers, b) local peaks in the Canyon Ranges. There were two well defined glacial advances in this mountain region: lllinoian, Late Wisconsinan, and one or more less defined pre-lllinoian glaciation(s). lllinoian and Late Wisconsinan glaciations are herein named Mountain River and Gayna River glaciations respectively. These advances are usually identifiable in valleys by frontal and segments of lateral moraines and glacial erosional features. Pre-lllinoian glaciation(s) have been recognized so far only in stratigraphie sections. The older advances were more extensive than the Gayna River advance; associated deposits occur higher on the valley sides and further down the valley than those associated with Gayna River Glaciation. During Mountain River Glaciation some of the montane glaciers in the Canyon Ranges merged to form piedmont glaciers. In contrast, during Gayna River Glaciation, the local glaciers consisted of single tongues, and these were mostly restricted to tributary valleys that had northward facing cirques.Au cours du Pléistocène, les monts Mackenzie ont connu une série de glaciations au cours desquelles un seul patron semble s'être répété : formation d'un inlandsis cordillérien à l'ouest de la ligne de partage continentale et formation de glaciers de vallée vers l'est. Les glaciers de vallée des monts Mackenzie provenaient de deux sources: a) la ligne de partage des glaces, qui se situait généralement le long de la ligne de partage des eaux entre le Pacifique et l'Arctique, et qui divisait l'inlandsis à écoulement vers l'ouest des glaciers de vallées s'écoulant vers l'est et le nord; b) les pics locaux des Canyon Ranges. Il y a eu deux avancées glaciaires bien définies dans cette région montagneuse: l'une à Plllinoien, l'autre au Wisconsinien supérieur, puis une ou plusieurs glaciations moins bien définies avant l'Illinoien. La glaciation de l'Illinoien est ici appelé Mountain River et celle du Wisconsinien supérieur, Gayna River. Dans les vallées, on peut habituellement identifier ces avancées par les moraines frontales et des segments de moraines latérales et par certaines formes d'érosion glaciaire. Jusqu'à maintenant, on a pu identifier les glaciations pré-illinoiennes dans quelques coupes seulement. Les avancées plus anciennes ont été plus importantes que celle de Gayna River. Ainsi les dépôts qui leur sont associés s'observent à des altitudes plus élevées et plus loin dans la vallée que ceux de la Glaciation de Gayna River. Pendant la G...

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“…In contrast, glaciated areas of Yukon, particularly areas glaciated during the Late Wisconsinan age McConnell Glaciation (Bostock, 1966;Hughes et al, 1969) have been unproductive.…”

Section: Introductionmentioning

confidence: 99%

“…The bedrock immediately adjacent to and below the gravels at the Ketza site is poorly exposed pillow basalts and basalt flows of one of these basins. The site lies well within terrain glaciated by the Selwyn lobe of the Cordilleran Ice Sheet during McConnell Glaciation (Hughes et al, 1969).…”

Section: Settingmentioning

confidence: 99%

Middle Wisconsinan Mammals, Stratigraphy, and Sedimentology at the Ketza River Site, Yukon Territory

Jackson¹,

Harington²

2007

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Remains of Middle Wisconsinan mammoth, bison, horse, moose, hare, ground squirrel and lemming were recovered from sediments that stratigraphically underlie till of the Late Wisconsinan McConnell Glaciation along the Ketza River valley. The bone-bearing sediments are a complex of colluvium, fan, and outwash sediments. Similar fossil sites are likely to occur where glaciofluvial watercourses abut hillside deposits laid down prior to the onset of McConnell Glaciation.Les restes de mammouth, de bison, de cheval, d'orignal, de lièvre, d'écureuil et de lemming ont été recueillis dans des sédiments sous-jacents au till de la Glaciation de McConnell du Wisconsinien supérieur, le long de la vallée de Ketza. Les sédiments renfermant ces ossements représentent un complexe de colluvions, d'alluvions et de sédiments fluvio-glaciaires. D'autres sites fossilifères risquent de se trouver là où les cours d'eau fluvio-glaciaires traversent des colluvions déposées avant le début de la Glaciation de McConnell.Reste von Mammut, Bison, Pferd, amerikanischem Elch, Hase, Eichhörnchen und Lemming aus dem mittleren Wisconsinium sind in Sedimenten, die stratigraphisch unter dem Till der McConnell-Vereisung des späten Wisconsiniums liegen, entlang des Ketza River-Tals gefunden worden. Dièse knochenhaltigen Sedimente bestehen aus einem Komplex von Kolluvium, Alluvialfachern und glazifluviatilen Sedimenten. Ähnliche Fossil-Fundstellen befinden sich wahrscheinlich da, wo glazifluviatile Wasserläufe auf Berghang-Ablagerungen treffen, die vor dem Beginn der McConnell-Vereisung abgelagert worden sind

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Glacial limits and flow patterns, Yukon Territory, south of 65 degrees north latitude

Cited by 40 publications

References 0 publications

A middle Pleistocene paleosol sequence from Dawson Range, Central Yukon Territory

A middle Pleistocene paleosol sequence from Dawson Range, Central Yukon Territory

Pleistocene Montane Glaciations in the Mackenzie Mountains, Northwest Territories

Middle Wisconsinan Mammals, Stratigraphy, and Sedimentology at the Ketza River Site, Yukon Territory

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