Dioxycaris Fritzi Sp. Nov. [Arthropoda, Phyllocarida] From the Pika Formation [Middle Cambrian, Bolaspidella Zone], Jasper National Park, Alberta

The Brazeau Lake slide, Jasper National Park, Alberta

Canadian Journal of Earth Sciences ◽

10.1139/e82-081 ◽

1982 ◽

Vol 19 (5) ◽

pp. 975-981 ◽

Cited By ~ 11

Author(s):

D. M. Cruden

Keyword(s):

National Park ◽

Bedding Plane ◽

Aerial Photographs ◽

Rupture Surface ◽

Average Width ◽

Middle Cambrian ◽

Jasper National Park ◽

Angle Of Friction ◽

Natural Event ◽

Slide Debris

An historic major rockslide has diverted John-John Creek northwards to its present channel flowing into Brazeau Lake in the Main Ranges of the Rockies in Jasper National Park, Alberta.The slide debris moved northeastwards from cliffs on the northeastern face of "Molard Mountain," an unnamed peak northeast of Flat Ridge in the Grand Brazeau. It reached the shores of Brazeau Lake.The debris occupies a plan area of 0.9 km2 with an average width of 500 m. An estimated average debris thickness of 5 m gives a volume of the displaced mass of 4.5 × 106 m3. The angle from the slide crown to the tip of the debris is about 18°. An approximate reconstruction of the depletion and accumulation of the slide suggests 23° as a lower bound for the angle of friction of the slide debris.The exposed rupture surface of the slide, a bedding plane in the lower portion of the Middle Cambrian Pika Formation, dips at 27° to the northeast. Dolostones, limestones, and shales from the Pika Formation form the slide debris. The slide site is in a panorama photographed in 1928. The slide shows on aerial photographs taken in 1951. A secondhand account of the slide places its occurrence in early July 1933. So the Brazeau Lake slide is the second major rockslide to occur in the Canadian Rockies this century and the first that is undoubtedly a natural event.

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"Culturing Wilderness in Jasper National Park: Studies in Two Centuries of Human History in the Upper Athabasca River Watershed" edited by I. MacLaren 2007. [book review]

The Canadian Field-Naturalist ◽

10.22621/cfn.v122i3.594 ◽

2008 ◽

Vol 122 (3) ◽

pp. 285

Author(s):

Cyndi M. Smith

Keyword(s):

National Park ◽

Human History ◽

Athabasca River ◽

River Watershed ◽

Jasper National Park

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Eighty years of change: vegetation in the montane ecoregion of Jasper National Park, Alberta, Canada

Canadian Journal of Forest Research ◽

10.1139/x02-112 ◽

2002 ◽

Vol 32 (11) ◽

pp. 2010-2021 ◽

Cited By ~ 48

Author(s):

Jeanine M Rhemtulla ◽

Ronald J Hall ◽

Eric S Higgs ◽

S Ellen Macdonald

Keyword(s):

National Park ◽

Vegetation Change ◽

Fire Regime ◽

Reference Conditions ◽

Habitat Diversity ◽

Climatic Conditions ◽

Aerial Photographs ◽

Contributing Factors ◽

Jasper National Park ◽

Closed Canopy

Repeat ground photographs (taken in 1915 and 1997) from a series of topographical survey stations and repeat aerial photographs (flown in 1949 and 1991) were analysed to assess changes in vegetation composition and distribution in the montane ecoregion of Jasper National Park, in the Rocky Mountains of Alberta, Canada. A quantitative approach for assessing relative vegetation change in repeat ground photographs was developed and tested. The results indicated a shift towards late-successional vegetation types and an increase in crown closure in coniferous stands. Grasslands, shrub, juvenile forest, and open forests decreased in extent, and closed-canopy forests became more prevalent. The majority of forest stands succeeded to dominance by coniferous species. Changes in vegetation patterns were likely largely attributable to shifts in the fire regime over the last century, although climatic conditions and human activity may also have been contributing factors. Implications of observed changes include decreased habitat diversity, increased possibility of insect outbreaks, and potential for future high-intensity fire events. Results of the study increase knowledge of historical reference conditions and may help to establish restoration goals for the montane ecoregion of the park.

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Holocene palaeoenvironmental record preserved in a paraglacial alluvial fan, Sunwapta Pass, Jasper National Park, Alberta, Canada

CATENA ◽

10.1016/0341-8162(94)90004-3 ◽

1994 ◽

Vol 22 (3) ◽

pp. 227-248 ◽

Cited By ~ 16

Author(s):

Alwynne B. Beaudoin ◽

Roger H. King

Keyword(s):

National Park ◽

Alluvial Fan ◽

Jasper National Park

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Using discriminant function analysis to identify Holocene tephras based on magnetite composition: a case study from the Sunwapta Pass area, Jasper National Park

Canadian Journal of Earth Sciences ◽

10.1139/e86-082 ◽

1986 ◽

Vol 23 (6) ◽

pp. 804-812 ◽

Cited By ~ 19

Author(s):

A. B. Beaudoin ◽

R. H. King

Keyword(s):

National Parks ◽

Discriminant Function ◽

Discriminant Function Analysis ◽

National Park ◽

Function Analysis ◽

Classification Schemes ◽

Jasper National Park ◽

Multivariate Method ◽

Reference Samples

The magnetite composition from three sets of samples of Mazama, St. Helens set Y, and Bridge River tephras from Jasper and Banff national parks are used to test whether discriminant function analysis can unambiguously distinguish these tephras. The multivariate method is found to be very sensitive to the change in reference samples. St. Helens set Y tephra is clearly distinguished. However, discrimination between Mazama and Bridge River tephras is less distinct. A set of unknown tephras from the Sunwapta Pass area was used to test the classification schemes. Unknown tephras are assigned to different tephra types depending on which reference tephra set is used in the discriminant function analysis.

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