scholarly journals Pleistocene Stratigraphy of the Athabasca River Valley Region, Rocky Mountains, Alberta

2007 ◽  
Vol 49 (3) ◽  
pp. 381-399 ◽  
Author(s):  
Victor M. Levson ◽  
Nathaniel W. Rutter
Keyword(s):  
Debris Flow ◽  
Rocky Mountains ◽  
Late Quaternary ◽  
Rocky Mountain ◽  
River Valley ◽  
Alluvial Fan ◽  
Front Range ◽  
Stratigraphic Sequence ◽  
Athabasca River ◽  
Lithostratigraphic Units

ABSTRACTThe Pleistocene stratigraphy of the central Canadian Rocky Mountains is described from a region where few studies of Late Quaternary deposits have been conducted. Six informal lithostratigraphic units are recognized from newly mapped exposures in Jasper National Park. The oldest deposits are interpreted as paleofan deposits (Unit 1) and they are overlain by glaciofluvial gravels and sands (Unit 2), glaciolacustrine sediments (Unit 3) and by a glacigenic diamicton sequence (Unit 4) that includes basal till, supraglacial deposits and ice-marginal debris flow sediments. Proximal glaciofluvial gravels, debris flow deposits and minor glaciolacustrine sediments (Unit 5) and paragiacial fan deposits and loess (Unit 6) cap the stratigraphic sequence. Limited chronologic control suggests that nonglacial fluvial and alluvial fan sedimentation began prior to 48 ka and continued throughout the Middle Wisconsinan. Braided stream deposits were accumulating in the Athabasca River valley near Jasper townsite about 29 ka. In the Late Wisconsinan, Rocky Mountain and Cordilleran glaciers advanced through the area, initially damming lakes in a number of Front Range tributary valleys. During déglaciation, ice-marginal glaciofluvial activity and paragiacial debris flows dominated sedimentation. Glacial lakes were limited in extent. A radiocarbon date on shells from one small ice-marginal lake indicates that glaciers were well in retreat by about 12 ka. Alpine glaciers in the region were at or near their present limits by 10 ka.

Late Quaternary rapid talus dissection and debris flow deposition on an alluvial fan in Syria

CATENA ◽  
2004 ◽  
Vol 55 (2) ◽  
pp. 125-140 ◽  
Author(s):  
Takashi Oguchi ◽  
Chiaki T. Oguchi
Keyword(s):  
Debris Flow ◽  
Late Quaternary ◽  
Alluvial Fan

scholarly journals Ice-rock avalanche of 2002 in Genaldon River valley, North Caucasus, Russia: consequences and problems

2006 ◽  
Vol 34 ◽  
pp. 99-108
Author(s):  
E. V. Zaporozhchenko
Keyword(s):  
Debris Flow ◽  
Water Mass ◽  
Rock Avalanche ◽  
Rocky Mountain ◽  
River Valley ◽  
Mountain Range ◽  
Left Bank ◽  
North Caucasus ◽  
Dammed Lake ◽  
The One

The biggest glacial disaster in the Russian history occurred in September 2002. A huge ice- rock-water flow from the Kolka Glacier went down the Genaldon River valley with a speed of 320 km/h. Having travelled a distance of 18.5 km, it was stopped by the 2 km long narrows of the Rocky Mountain Range and it filled the hollow with 120 ml of deposits. The ice­ rock-water mass pressed through the narrows forming a debris flow which went down the valley for 10 km devastating all the settlements on the riverbed. As a result, 125 people lost their lives. In 2002, two months before the disaster, a series of collapses from an elevation of about 1000 m at the backside of the glacier had activated the avalanche. The last ice- mass collapse had a volume of 10 million ml. The material accumulated in the glacier hollow was knocked off and went down the valley. The 100-150 m high ice- rock- water mass (with air also) was moving down the 400- 500 m wide valley. The flow on its way down the valley trough was fed by the frontal masses of three huge ancient landslides situated on the left bank. The hazards and risks after 2002 can be attributed mainly to the filling up of the hollow by the ice-rock material, the formation of a dammed lake, and the filling up of the narrows by debris flow and mudflow deposits. Presently the dammed lake is discharging naturally and there is about 0.5 million ml of water in it. The future behaviour of the ice-rock dam is not clear and it is difficult to make any forecast due to its melting on the one hand and the formation of underground outflows with sporadic floods on the other hand. In 2002-2004 the debris flow deposits on the riverbed were still unstable and loose. A surge with a discharge of more than 20 m3/sec and (or) a storm flood of such a magnitude can adversely affect the riverbed processes in the overpopulated foothill areas requiring mitigation and protective measures.

scholarly journals Checklist and Ecology of the Agaricales, Russulales and Boletales in the alpine zone of the Rocky Mountains (Colorado, Montana, Wyoming) at 3000-4000 m a.s.l.

Sommerfeltia ◽  
2008 ◽  
Vol 31 (1) ◽  
pp. 101-123 ◽  
Author(s):  
C. Cripps ◽  
E. Horak
Keyword(s):  
Rocky Mountains ◽  
Woody Debris ◽  
Rocky Mountain ◽  
Front Range ◽  
San Juan Mountains ◽  
The North ◽  
Alpine Zone ◽  
Number Of Publications ◽  
Taxonomic Groups ◽  
Sawatch Range

Checklist and Ecology of the Agaricales, Russulales and Boletales in the alpine zone of the Rocky Mountains (Colorado, Montana, Wyoming) at 3000-4000 m a.s.l.Previously, the Rocky Mountain alpine zone was a mycological blank spot. There have only been a few scattered records of macrofungi from this region and limited number of publications. This alpine survey covers the Beartooth Plateau in Montana/Wyoming for the North-central Floristic Region (lat 45°N) and the Front Range, San Juan Mountains, Sawatch Range for the Southern Floristic Region in Colorado (lat 36°-38°N), and reports over 165 species in 46 genera and 11 families (ca 1 500 collections). It is estimated that over 75% are known arctic-alpine macromycetes and the remainder are Rocky Mountain species. Of these, we estimate that 2-5% are new to science, 75% are new records for this Rocky Mountain alpine zone, and that over half will be new to Colorado or Montana/Wyoming. Approximately 56% are mycorrhizal species associated with Salix reticulata, S. arctica, S. planifolia, S. glauca, Betula nana = B. glandulosa, Dryas octopetala and Polygonum viviparum. Mycorrhizal species that occur with Betula are rare in the Rockies due to a paucity of this host. The most diverse mycorrhizal family is the Cortinariaceae with over 74 species, primarily of Inocybe and Cortinarius. Saprobic genera associate with a diversity of bryophytes or are terrestrial primarily in grassland; macrofungi on woody debris are rare. A greater diversity occurs in southern mountain ranges which are more diverse in geology and habitat. The southern extent of the Rockies at latitudes of 36-38°N likely includes the southernmost extent of certain Arctic-alpine fungi such as Arrhenia auriscalpium for the Northern hemisphere. Macrofungal fruitings are sparse compared to those in maritime arctic-alpine habitats due to a well-defined continental climate with drying winds, low relative humidity, periodic droughts, fire, strong diurnal temperature fluctuations and high elevations of 3 000-4 000 m. This report helps complete distributions of arctic-alpine fungi, and discusses the ecology of individual taxonomic groups in relation to other Arctic-alpine areas.

Mitbringsel aus den Ferien

Praxis ◽  
2005 ◽  
Vol 94 (47) ◽  
pp. 1869-1870
Author(s):  
Balestra ◽  
Nüesch
Keyword(s):  
Rocky Mountains ◽  
Spotted Fever ◽  
Rocky Mountain ◽  
Rickettsia Conorii ◽  
Rocky Mountain Spotted Fever ◽  
Klinische Diagnose ◽  
Rickettsia Rickettsii

Eine 37-jährige Patientin stellt sich nach der Rückkehr von einer Rundreise durch Nordamerika mit einem Status febrilis seit zehn Tagen und einem makulösem extremitätenbetontem Exanthem seit einem Tag vor. Bei suggestiver Klinik und Besuch der Rocky Mountains wird ein Rocky Mountain spotted fever diagnostiziert. Die Serologie für Rickettsia conorii, die mit Rickettsia rickettsii kreuzreagiert, war positiv und bestätigte die klinische Diagnose. Allerdings konnte der beweisende vierfache Titeranstieg, möglicherweise wegen spät abgenommener ersten Serologie, nicht nachgewiesen werden. Nach zweiwöchiger antibiotischer Therapie mit Doxycycline waren Status febrilis und Exanthem regredient.

New insights into debris-flow hazards from an extraordinary event in the Colorado Front Range

GSA Today ◽  
2014 ◽  
Vol 24 (10) ◽  
pp. 4-10 ◽  
Author(s):  
Jeffrey A. Coe ◽  
Jason W. Kean ◽  
Jonathan W. Godt ◽  
Rex L. Baum ◽  
Eric S. Jones ◽  
...  
Keyword(s):  
Debris Flow ◽  
Colorado Front Range ◽  
Front Range
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