Thermoluminescence dating applied to a thin winter varve of the late glacial South Thompson silt, south-central British Columbia

1985 ◽  
Vol 22 (11) ◽  
pp. 1736-1739 ◽  
Author(s):  
G. W. Berger
Keyword(s):  
British Columbia ◽  
Late Glacial ◽  
The Other ◽  
Tl Dating ◽  
South Central ◽  
Thermoluminescence Dating ◽  
Other Hand ◽  
Apparent Age

The partial bleach (R–Γ) procedure of thermoluminescence (TL) dating of unheated sediments has been applied to the 2–4 μm sized feldspar-dominated grains from two components of a 10–11 ka BP glaciolacustrine silt. A previous TL study of the 4–11 μm sized feldspars from a ~12 cm thick summer layer of this varved deposit did not produce the correct age. Here it is shown that the 2–4 μm feldspar grains from a contiguous, 5 mm thick clay-rich winter varve give a satisfactory TL apparent age of 14.2 ± 2.3 ka. On the other hand, and consistent with the previous results, the 2–4 μm feldspar grains from the thicker summer layer yield an incorrect high apparent age of 55 ± 13 ka. These results have implications for general TL dating of waterlaid sediments.

Thermoluminescence dating studies of rapidly deposited silts from south-central British Columbia

1985 ◽  
Vol 22 (5) ◽  
pp. 704-710 ◽  
Author(s):  
Glenn W. Berger
Keyword(s):  
British Columbia ◽  
Deposition Rate ◽  
Quaternary Sediments ◽  
Tl Dating ◽  
Small Lake ◽  
Fine Grain ◽  
South Central ◽  
Thermoluminescence Dating ◽  
Visible Wavelengths

To determine whether Quaternary sediments from small lake and fan deposits can be dated by thermoluminescence (TL) methods, I have applied recently proposed techniques for TL dating to known-age, rapidly deposited silts and have examined the sensitivity of the TL of fine-grain feldspars and quartz to light. These feldspar-dominated silts exhibited little or no detectable anomalous fading. The TL of quartz was observed to be very resistant to light with wavelengths above ~400 nm, whereas that of feldspars was sensitive to all visible wavelengths. No significant resetting of the TL of the 11 ka old glaciolacustrine silt (deposition rate [Formula: see text]) could be detected with these techniques, implying that silts deposited at such rates into small, glacier-bordered lakes cannot be dated by these methods. However, accurate equivalent doses were measured for the derivative 7.5 ka old mudflow silts (~1 mm/year), but only with the use of the R–Γ technique applied to the feldspars.

Applied Anthropology in 1860

1942 ◽  
Vol 1 (3) ◽  
pp. 19-32
Author(s):  
H. Barnett
Keyword(s):  
British Columbia ◽  
Church And State ◽  
Applied Anthropology ◽  
The Other ◽  
Public And Private ◽  
Other Hand ◽  
The Subject ◽  
Long Life

Much has been written of William Duncan, "the Apostle of Alaska", who came to the coast of northern British Columbia in 1857 as a missionary to the Tsimshian Indians. Although he deplored it, in the course of his sixty years' residence in this area controversy raged around him as a result of his clashes with church and state, and his work has been the subject of numerous investigations, both public and private. His enemies have called him a tyrant and a ruthless exploiter of the Indians under his control; and there are men still living who find a disproportionate amount of evil in the good that he did, especially during the declining years of his long life. On the other hand, he has had ardent and articulate supporters who have written numerous articles and no less than three books in praise of his self-sacrificing ideals and the soundness of his program for civilizing the Indian.

Relative Virulence of Botrytis cinerea and B. mali in Apple Lesions

2010 ◽  
Vol 11 (1) ◽  
pp. 7
Author(s):  
Reza H. Etebarian ◽  
Daniel T. O'Gorman ◽  
Peter L. Sholberg
Keyword(s):  
British Columbia ◽  
Botrytis Cinerea ◽  
Apple Fruit ◽  
The Other ◽  
Specific Primer ◽  
Fluorescent Intensity ◽  
Other Hand ◽  
Apple Tissue ◽  
Pcr Test

Botrytis cinerea and recently B. mali have been identified as important postharvest pathogens of apples in British Columbia (BC), Canada. Three isolates of both B. cinerea and B. mali were studied alone and in combination by inoculating mature ‘Gala’ apple fruit to compare their potential for causing decay. The fruit were incubated at 20°C for 6 and 8 days when lesion areas were calculated from lesion diameters. The lesion areas in apples inoculated with B. cinerea ranged from 1020 to 1514 mm2 compared to 130 to 293 mm2 for B. mali after 6 days. Primers developed to specifically amplify B. mali or B. cinerea were used in a PCR test to determine which Botrytis spp. was present in a particular lesion and estimate the quantity of each species. Relative fluorescent intensity of DNA extracted from apple tissue co-inoculated with B. cinerea + B. mali and amplified with the B. cinerea specific primer averaged 102.3%. On the other hand, the fluorescence produced by the B. mali primer averaged only 11.6% from the same DNA samples. These results confirmed that when both B. cinerea and B. mali are mixed together, B. cinerea becomes the dominant pathogen. Accepted for publication 2 July 2010. Published 20 September 2010.

scholarly journals Post-glacial diatom-inferred aquatic changes in Sicamous Creek Lake, British Columbia, Canada

2014 ◽  
Vol 27 (3) ◽  
pp. 233-256 ◽  
Author(s):  
Andrea C. Voit ◽  
Richard J. Hebda ◽  
Julien M.J. Racca ◽  
Reinhard Pienitz ◽  
Ian R. Walker ◽  
...  
Keyword(s):  
British Columbia ◽  
Open Water ◽  
Late Glacial ◽  
High Elevation ◽  
Low Light ◽  
Subalpine Fir ◽  
Engelmann Spruce ◽  
South Central ◽  
Inferred Ph

Diatom analyses of sediments from a high elevation lake situated in an Engelmann Spruce - Subalpine Fir (ESSF) forest of south-central British Columbia, Canada, reveal long-term climate and water chemistry change. During the transition from the late-glacial / Pleistocene to the xerothermic early Holocene, small, benthic Fragilaria diatoms species that grew under low light conditions in Sicamous Creek Lake gave way to planktonic Cyclotella species that require open-water conditions. Warm temperatures in the mesothermic Holocene are indicated by smaller Cyclotella species and large, benthic pennate diatoms. Diatom communities reflected Neoglacial cooling in the late Holocene, with abundant Nitzschia fonticola and Achnanthes minutissima. Small, benthic Fragilaria regained abundance, suggesting cooling and conditions similar to the late-glacial interval. Diatom community composition responded to the deposition of the Mt. Mazama and Mt. St. Helens tephras, though the Mazama eruption caused greater change in relative abundance of various taxa within the assemblage. Correspondence analysis shows distinct communities have occurred since the initiation of sedimentation, likely due to climate controlled landscape and vegetation changes; diatom-inferred pH values using various models and training sets show limited acidification change occurred through the lake’s history.

Who Uses Interest Arbitration? The Case of British Columbia's Teachers, 1947–1981

ILR Review ◽  
1989 ◽  
Vol 42 (3) ◽  
pp. 363-379 ◽  
Author(s):  
Janet Currie
Keyword(s):  
British Columbia ◽  
Simple Model ◽  
Empirical Finding ◽  
The Other ◽  
Principal Agent ◽  
Data Set ◽  
Unique Data ◽  
Other Hand ◽  
Previous Round

Several researchers have attempted to identify the circumstances under which parties subject to compulsory interest arbitration will actually push a contract dispute to arbitration. In this paper, a simple model that incorporates elements of the leading hypotheses is tested using a unique data set spanning 35 years of compulsory conventional arbitration experience among teachers in British Columbia. The strongest empirical finding is that bargaining units that used arbitration in the previous round of negotiations were at least ten percent more likely than other units to use it in the current round. On the other hand, variables intended to capture attitudes toward risk, changes in the degree of uncertainty associated with arbitral outcomes, differing beliefs about likely arbitral outcomes, and principal-agent problems were found to have little impact on the estimated probability of using arbitration.

GEOMORPHOLOGICAL EVIDENCE AND NUMERICAL MODELLING OF A LATE-GLACIAL MEGAFLOOD, SOUTH-CENTRAL BRITISH COLUMBIA

2017 ◽  
Author(s):  
Jonathan E. Cripps ◽  
◽  
Tracy A. Brennand ◽  
Roger P. Denlinger ◽  
David L. George
Keyword(s):  
British Columbia ◽  
Numerical Modelling ◽  
Late Glacial ◽  
South Central

scholarly journals Progressive Homes Ltd. v. Lombard General Insurance Co. of Canada

2013 ◽  
Vol 50 (3) ◽  
pp. 697
Author(s):  
Peter Bowal
Keyword(s):  
British Columbia ◽  
Supreme Court ◽  
The Other ◽  
Supreme Court Of Canada ◽  
Judicial Decision ◽  
General Contractor ◽  
General Insurance ◽  
Other Hand ◽  
The Supreme Court

The unanimous judicial decision of the Supreme Court of Canada in Progressive Homes Ltd. v. Lombard General Insurance Co. of Canada resolves divergent appellate judicial holdings, in British Columbia on one hand and Ontario and Saskatchewan on the other hand, on the issue of an insurer’s duty to defend its insured general contractor in the ensuing litigation under commercial general liability (CGL) policies in cases of defective construction workmanship.

scholarly journals Thermoluminescence Dating of Late Pleistocene Sediments, St. Lawrence Lowland, Québec

2007 ◽  
Vol 42 (1) ◽  
pp. 33-44 ◽  
Author(s):  
Michel Lamothe ◽  
David J. Huntley
Keyword(s):  
Late Pleistocene ◽  
Late Glacial ◽  
Future Research ◽  
Eastern Canada ◽  
Tl Dating ◽  
Glacial Sediments ◽  
Thermoluminescence Dating ◽  
Method R

ABSTRACT This paper presents the results of a thermoluminescence (TL) dating program applied to waterlaid sediments of Late Pleistocene age, collected in the central St. Lawrence Lowland, in eastern Canada. The apparent TL ages were obtained using a partial bleach method (R-Gamma) in which the TL from light-sensitive traps is separated from the total TL. Fluvial (modern), marine (late-glacial) lacustrine (interstadial) and glacio-lacustrine (stadial) sediments yielded apparent ages ranging from 4 to 135 ka, and in general, these ages agreed with available stratigraphic evidence. Whilst testing the zeroing assumption, apparent TL ages obtained from modern fluvial and late glacial sediments suggest that laboratory overbleaching or insufficient natural bleaching may result in over-estimation of the apparent TL ages by 4-5 ka. All samples display anomalous fading, a problem that can be overcome by introducing a three month delay between artificial irradiation and glowing. Future research should focus on sediments for which the age as well as the sedimentology are well documented, such as the late glacial Champlain Sea sediments.

Devine qui s’invite aux élections cette année ! Les minorités visibles et leur représentation politique en Ontario et en Colombie-Britannique (Canada)

2020 ◽  
Vol 59 (2) ◽  
pp. 380-404
Author(s):  
Pascasie Minani Passy ◽  
Abdoulaye Gueye
Keyword(s):  
British Columbia ◽  
Minority Groups ◽  
Political Representation ◽  
The Other ◽  
The Political ◽  
Other Hand ◽  
White Majority ◽  
The Difference ◽  
The One ◽  
Représentation Politique

This article deals with the level of political representation of ethnoracial minority groups in the legislative assemblies of Ontario and British Columbia. It aims at evaluating several theories on the level of political representation of ethnoracial minorities on the one hand, and on the difference between the levels of political representation of these groups on the other hand. One of its main inputs is theoretical. First, it introduces a complexification of the residential concentration theory and, above all of the premise of ethnic affinity by suggesting that a distinction should be made between two concepts: on the one hand centripetal ethnic affinity and, on the other hand, transversal ethnic affinity. The first concept deals with emotional tendencies – expressed by concrete acts – of members of an ethnic group to answer favorably to the incitement of individuals (As) who have the same ethnic identity than them (the As), against individuals of a different ethnicity (the Bs). Moreover, the concept of transversal ethnic affinity is of foremost importance here, as we talk about the political dynamism of pluriethnic societies where the distinction between majority and minority is far from enlightening, as each of these entities is composite, including indeed several ethnic groups whose interests converge as much as they differ according to the situations. This concept also draws its usefulness from the opportunity it offers to measure the meaning within the political space of the dichotomy between ‘white majority group’ and ‘racialized minority.’ On the methodological side, this article proceeds from the complete counting of legislative elections’ results that took place in 2018 in Ontario and 2017 in British Columbia, according to two main criteria: a) the ethnoracial identification of elected candidates, and b) the ethnic distribution of the population living in the electoral districts that elected a member of an ethnoracial minority.

Thermoluminescence dating applied to glaciolacustrine sediments from central British Columbia

1987 ◽  
Vol 24 (3) ◽  
pp. 425-434 ◽  
Author(s):  
G. W. Berger ◽  
J. J. Clague ◽  
D. J. Huntley
Keyword(s):  
British Columbia ◽  
Particle Size ◽  
Regression Analysis ◽  
Glow Curve ◽  
Lacustrine Sediments ◽  
Tl Dating ◽  
Thermoluminescence Dating ◽  
Single Exception ◽  
Absolute Dating ◽  
Sedimentation Processes

Glaciolacustrine and lacustrine sediments are important indicators of deglacial, interglacial, and nonglacial intervals within the Quaternary of Canada, yet there are no techniques for measuring their absolute deposition ages beyond the last ~ 50 000 years. In an attempt to develop an absolute dating tool for such sediments, we applied the partial bleach thermoluminescence (TL) dating technique to glaciolacustrine sediments of known age from central British Columbia. Samples were selected to represent both ice-proximal and ice-distal deposition and different modes of sedimentation.The results show clearly that both TL procedures and sedimentation processes, as reflected in the particle size and sedimentary structures of the samples, critically affected the accuracy of TL apparent ages. Specifically, care was required to isolate the effects of laboratory overbleaching, apparent glow-curve shifts, and inappropriate regression analysis. Clay-dominant layers lacking silt or sand interlayers produced expected ages, whereas sand- and silt-rich samples (with one exception) yielded excessive TL apparent ages. The single exception was a thin (9 mm), ice-distal, silt-rich layer.

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