Late Holocene glacier expansion in the Cariboo and northern Rocky Mountains, British Columbia, Canada

2012 ◽  
Vol 51 ◽  
pp. 71-80 ◽  
Author(s):  
Malyssa K. Maurer ◽  
Brian Menounos ◽  
Brian H. Luckman ◽  
Gerald Osborn ◽  
John J. Clague ◽  
...  
Keyword(s):  
British Columbia ◽  
Rocky Mountains ◽  
Late Holocene ◽  
Northern Rocky Mountains

A late Holocene record of disturbance from the northern Rocky Mountains, USA

2013 ◽  
Vol 310 ◽  
pp. 245
Author(s):  
Jennifer H. Watt ◽  
Andrea Brunelle ◽  
Kurt Kipfmueller
Keyword(s):  
Rocky Mountains ◽  
Late Holocene ◽  
Northern Rocky Mountains ◽  
Holocene Record

Regionalization of fire regimes in the Central Rocky Mountains, USA

2013 ◽  
Vol 80 (3) ◽  
pp. 406-416 ◽  
Author(s):  
Vachel A. Carter ◽  
Andrea Brunelle ◽  
Thomas A. Minckley ◽  
Philip E. Dennison ◽  
Mitchell J. Power
Keyword(s):  
Rocky Mountains ◽  
Late Holocene ◽  
Fire Regime ◽  
Fire Regimes ◽  
Northern Rocky Mountains ◽  
Southern Rocky Mountains ◽  
The Past ◽  
The Us ◽  
Central Rocky Mountains ◽  
Early And Middle Holocene

Fire is one of the most important natural disturbances in the coniferous forests of the US Rocky Mountains. The Rocky Mountains are separated by a climatic boundary between 40° and 45° N, which we refer to as the central Rocky Mountains (CRM). To determine whether the fire regime from the CRM was more similar to the northern Rocky Mountains (NRM) or southern Rocky Mountains (SRM) during the Holocene, a 12,539-yr-old sediment core from Long Lake, Wyoming, located in the CRM was analyzed for charcoal and pollen. These data were then compared to charcoal records from the CRM, NRM and SRM. During the Younger Dryas chronozone, the fire regime was characterized as frequent at Long Lake. The early and middle Holocene fire regime was characterized as infrequent. A brief interval from 4000 to 3000 cal yr BP, termed the Populus period, had a frequent fire regime and remained frequent through the late Holocene at Long Lake. In comparison to sites from the NRM and SRM, the fire regime at Long Lake was most similar to the SRM during the past 12,539 cal yr BP. These results suggest the disturbance regime in the CRM has a greater affinity with those of the SRM.

A structural interpretation across part of the northern Rocky Mountains, British Columbia, Canada

1979 ◽  
Vol 16 (6) ◽  
pp. 1228-1241 ◽  
Author(s):  
Robert I. Thompson
Keyword(s):  
British Columbia ◽  
Rocky Mountains ◽  
Lateral Displacement ◽  
Rocky Mountain ◽  
Thrust Faults ◽  
Northern Rocky Mountains ◽  
Eastern Margin ◽  
The North ◽  
Structural Style ◽  
Mountain Front

The northern Canadian Rocky Mountains, as exemplified by the Halfway River map-area (94B) in British Columbia, consists of a rugged and mountainous structurally complex Foothills subprovince of large amplitude box and chevron-style folds in rocks of late Paleozoic and Mesozoic age, and a structurally diverse Rocky Mountain subprovince with open folds and apparently inconspicuous thrust faults in upper Precambrian to upper Paleozoic rocks; separating them is a narrow topographically subdued and heavily vegetated 'transition interval' comprising more penetratively folded and faulted shales and thin-bedded carbonate rocks of late Devonian and Mississippian age.Flat thrust faults, with displacements in the order of 10 km, which occur under the eastern margin of the Rocky Mountain subprovince (mountain front) extend across the 'transition interval' and beneath the western margin of the Foothills subprovince. These faults terminate within a décollement along the Devonian and Mississippian Besa River shale, as the displacement on them is transformed into disharmonic kink-type box and chevron folds in overlying units and into tectonic thickening within the Besa River shale. Because most of the major thrust faults along the Rocky Mountains are 'blind' and cannot be traced to surface exposures, one is left with the erroneous impression that very little lateral displacement (foreshortening) has occurred in the northern Canadian Rocky Mountains.The basic change from a well organized thrust-fault terrane in the southern Rockies to a more diverse fold terrane with few large mappable thrusts in the north is consistent with changes in the stratigraphic character of the rock prism that was deformed: the proportion of thick incompetent shale units increases northward, and major lateral carbonate to shale facies transitions traverse the eastern margin of the Rocky Mountain subprovince.Despite the differences in structural style from south to north, strain patterns within the northern Rocky Mountains are consistent with the lateral eastward movement of a detached prism of sedimentary rocks, and support the basic tenets of thin-skinned tectonics.

Early establishment of conifer recruits in the northern Rocky Mountains as a function of postfire duff depth

2009 ◽  
Vol 39 (11) ◽  
pp. 2059-2064 ◽  
Author(s):  
M. Hesketh ◽  
D. F. Greene ◽  
E. Pounden
Keyword(s):  
British Columbia ◽  
Rocky Mountains ◽  
Additional Data ◽  
Mineral Soil ◽  
Data Sets ◽  
Hypocotyl Length ◽  
Northern Rocky Mountains ◽  
Early Establishment

Well-combusted duff (<3 cm depth) is generally considered the best seedbed for small-seeded species on upland sites, but we ask here, What is the optimal, postfire residual duff thickness? We hypothesize that a duff thickness equal to (but not greater than) the length of the germinant will offer the best conditions, because at this thickness, the duff layer will not prohibit radicle penetration into the mineral soil, and yet it will serve as a water-conserving mulch. Data from a recent fire in the Rocky mountains of British Columbia were used to show that for three species of Pinus and Picea, (1) duff depths <3 cm were far more clement substrates than thicker duff, and (2) there was a peak in relative survivorship at about 1–2 cm, somewhat shallower than the typical hypocotyl length for these species. Additional data sets from studies previously conducted at boreal and northern cordilleran sites in Alberta, Saskatchewan, Yukon, and Quebec (a combined 21 fires) bolstered these results.

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