AMS-dated late Pleistocene taiga vole (Rodentia: Microtus xanthognathus) from northeast British Columbia, Canada: a cautionary lesson in chronologyThis article is one of a selection of papers published in this Special Issue on the theme Geology of northeastern British Columbia and northwestern Alberta: diamonds, shallow gas, gravel, and glaciers.

2008 ◽  
Vol 45 (5) ◽  
pp. 611-618 ◽  
Author(s):  
Richard J. Hebda ◽  
James A. Burns ◽  
Marten Geertsema ◽  
A. J. Timothy Jull
Keyword(s):  
British Columbia ◽  
Late Pleistocene ◽  
Bone Collagen ◽  
Laurentide Ice Sheet ◽  
Special Issue ◽  
Cautionary Note ◽  
Shallow Gas ◽  
Peace River ◽  
Elusive Species ◽  
Selection Of

Dissected colluvial sediments on a Peace River terrace at Bear Flat, northeast British Columbia enclosed a late Pleistocene micromammalian faunule. The fossil remains, including a few loosely articulated skulls and mandibles, were dominated by taiga voles ( Microtus xanthognathus ). The Bear Flat site constitutes the second fossil occurrence in the region of this elusive species, which is unknown in British Columbia in historic times. The late Pleistocene age, determined by accelerator mass spectrometry directly on taiga vole bone collagen, is consistent with the ages of widespread taiga vole records peripheral to the Laurentide ice sheet in western, mid-western, and eastern North America. The presence of allo-chronous remains within a comprehensively dated sedimentary sequence provides a cautionary note about straightforward acceptance of relative stratigraphic dating.

Quaternary stratigraphy and glacial history of the Peace River valley, northeast British ColumbiaThis article is one of a selection of papers published in this Special Issue on the theme Geology of northeastern British Columbia and northwestern Alberta: diamonds, shallow gas, gravel, and glaciers.

2008 ◽  
Vol 45 (5) ◽  
pp. 549-564 ◽  
Author(s):  
Gregory M.D. Hartman ◽  
John J. Clague
Keyword(s):  
British Columbia ◽  
River Valley ◽  
Quaternary Sediments ◽  
Shallow Gas ◽  
Peace River ◽  
Last Glaciation ◽  
Quaternary Stratigraphy ◽  
History Of ◽  
Late Wisconsinan ◽  
Selection Of

Two Cordilleran and three Laurentide glacial advances are recorded in Quaternary sediments and landforms in the Peace River valley, northeast British Columbia. The advances are inferred from fluvial gravels, glaciolacustrine sediments, and tills within nested paleovalleys excavated during three interglaciations and from the distribution of granitoid clasts derived from the Canadian Shield. Till of the last (Late Wisconsinan) Laurentide glaciation occurs at the surface, except where it is overlain by postglacial sediments. The advance that deposited this till was the most extensive in the study area, and the only advance definitively recognized in western Alberta south of the study area. Late Wisconsinan Cordilleran till has not been found in the study area, but Cordilleran and Laurentide ice may have coalesced briefly during the last glaciation. Support for this supposition is provided by the inferred deflection of Laurentide flutings to the southeast by Cordilleran ice. The earliest Laurentide advance may have been the least extensive of the three Laurentide events recognized in the study area. Erratics attributed to this advance occur only east of the Halfway River – Beatton River drainage divide.

Mapping Quaternary paleovalleys and drift thickness using petrophysical logs, northeast British Columbia, Fontas map sheet, NTS 94IThis article is one of a selection of papers published in this Special Issue on the theme Geology of northeastern British Columbia and northwestern Alberta: diamonds, shallow gas, gravel, and glaciers.

2008 ◽  
Vol 45 (5) ◽  
pp. 577-591 ◽  
Author(s):  
Adrian S. Hickin ◽  
Ben Kerr ◽  
Derek G. Turner ◽  
Tom E. Barchyn
Keyword(s):  
British Columbia ◽  
Oil And Gas ◽  
Special Issue ◽  
Quaternary Sediments ◽  
Shallow Gas ◽  
Gas Well ◽  
Well Drilling ◽  
Bedrock Topography ◽  
Petrophysical Logs ◽  
Selection Of

The relatively subdued topography of British Columbia’s northern interior plains does not reflect the irregular, buried bedrock surface. Many areas have been deeply incised by preglacial rivers that have subsequently filled with a succession of Quaternary sediments. In this study, oil and gas petrophysical logs, drill chip samples, water well logs, and surficial and bedrock outcrop maps were used to model the bedrock topography of the Fontas map sheet (NTS 94I). The modelled data produced several depressions that are interpreted to be paleovalleys incised into the soft Cretaceous shale of the Fort St. John Group. Understanding the geometry, thickness, and stratigraphy of the drift has considerable safety and resource management implications as artesian aquifers and natural gas were encountered in the drift during oil and gas well drilling. Four major paleovalleys are suggested. The most dominant paleovalley (Kotcho–Hoffard Paleovalley) is located south of the Etsho Plateau and trends west-southwest across the map area. A second depression occurs within the loop of the Hay River and may be a tributary of the Kotcho–Hoffard Paleovalley that links with the Rainbow Paleovalley in Alberta. A third paleovalley is mapped south of the Sahtaneh River (Kyklo Creek Paleovalley) and is either a tributary to, or crosscuts the Kotcho–Hoffard Paleovalley. The Niteal Creek Paleovalley is located between the Fontas and Sikanni Chief rivers. Its geometry is speculative as there are sparse data, but it may be a tributary of the Kotcho–Hoffard Paleovalley.

Late Pleistocene age, size, and paleoenvironment of a caribou antler from Haida Gwaii, British Columbia

2019 ◽  
Vol 56 (6) ◽  
pp. 688-692 ◽  
Author(s):  
Rolf W. Mathewes ◽  
Michael Richards ◽  
Thomas E. Reimchen
Keyword(s):  
British Columbia ◽  
Late Pleistocene ◽  
Vegetation Cover ◽  
Coniferous Forest ◽  
Bone Collagen ◽  
Haida Gwaii ◽  
Terrestrial Vertebrates ◽  
Mis 3 ◽  
Basal Portion ◽  
Marine Isotope Stage 3

The basal portion of a fossil caribou antler from Graham Island is the only evidence of large terrestrial vertebrates older than the Fraser (late-Wisconsin) glaciation on Haida Gwaii. This antler has been radiocarbon dated three times by different laboratories and all ages fall within the mid-Wisconsin Olympia Interglaciation (Marine Isotope Stage 3, MIS 3). We suggest that the latest date, using ultrafiltration of bone collagen, is closest to the true age at 43 200 ± 650 years BP (48 200 – 45 200 cal BP). Previous paleoecological analysis from Graham Island reconstructed a vegetation cover during MIS 3 consisting of mixed coniferous forest with nonforested openings, similar to cool subalpine forests of today. These conditions are consistent with environments that support woodland caribou and the related extinct Dawson caribou. Morphometric comparison of antlers from woodland and Dawson caribou suggest that they are more similar than previously interpreted and raise questions about the inferred differences between the mainland and island subspecies.

scholarly journals Special Issue Dedicated to ICFP 2008 Editorial

2010 ◽  
Vol 20 (5-6) ◽  
pp. 415-416
Author(s):  
PETER THIEMANN ◽  
HENRIK NILSSON
Keyword(s):  
British Columbia ◽  
Functional Programming ◽  
Program Committee ◽  
Special Issue ◽  
International Conference ◽  
Selection Of

The 13th ACM SIGPLAN International Conference on Functional Programming (ICFP) was held in Victoria, British Columbia, Canada, in September 2008. Peter Thiemann chaired the program committee. After the conference, the authors of a selection of the presented papers were invited to submit extended versions of their work for this special issue of Journal of Functional Programming dedicated to ICFP 2008. All submitted papers were reviewed by at least three referees, including at least one expert, following the standard JFP procedures. In the end, four papers were accepted. These cover a broad range of topics and, taken together, we think they represent well the scope of ICFP 2008.

Rb–Sr and U–Pb geochronology and setting of the Buffalo Head Hills kimberlite field, northern AlbertaThis article is one of a selection of papers published in this Special Issue on the theme Geology of northeastern British Columbia and northwestern Alberta: diamonds, shallow gas, gravel, and glaciers.

2008 ◽  
Vol 45 (5) ◽  
pp. 513-529 ◽  
Author(s):  
D. Roy Eccles ◽  
Robert A. Creaser ◽  
Larry M. Heaman ◽  
Jeff Ward
Keyword(s):  
Northwestern Part ◽  
Special Issue ◽  
Southwestern Part ◽  
Shallow Gas ◽  
Rock Classification ◽  
North Central ◽  
Morphological Complexity ◽  
Hills Area ◽  
Kimberlite Field ◽  
Selection Of

New Rb–Sr phlogopite and U–Pb perovskite age determinations for 12 of 38 known ultramafic bodies in the Buffalo Head Hills area of north-central Alberta show that kimberlitic magmatism occurred in at least two separate episodes during Late Cretaceous and Paleocene time. Nine kimberlites yield Coniacian to Campanian ages of between 88 ± 5 Ma (U–Pb perovskite, K5A) and 81.2 ± 2.3 Ma (Rb–Sr phlogopite, K252). A Danian U–Pb perovskite isochron age of 63.5 ± 0.7 Ma was obtained for the BM2 kimberlite, and Selandian Rb–Sr ages of 59.6 ± 2.8 and 60.3 ± 0.8 Ma were determined for the K1A and K19 bodies, respectively. These specific periods of magmatism correspond to characteristic intra-field features such as kimberlite spatial distribution, diamond content, rock classification, and mechanisms of emplacement. The ∼88–81 Ma group generally occurs in the northwestern part of the field and defines the diamond window for the Buffalo Head Hills kimberlite field. This volcanism is contemporaneous with sedimentary host rock deposition, which has important implications for the size and morphological complexity of the kimberlite bodies. The ∼64 Ma BM2 body represents the only known occurrence of hypabyssal-facies kimberlite in this field and is similar in terms of source composition to the ∼88–81 Ma kimberlites, but is not diamond bearing. The ∼60 Ma group occurs in the southwestern part of the field, is derived from a weakly diamondiferous – barren hybrid ultramafic source and features bodies that are eroded to present-day stratigraphic levels.

Geology of northeast British Columbia and northwest Alberta: diamonds, shallow gas, gravel, and glaciersThis article introduces a selection of papers published in this Special Issue on the theme Geology of northeastern British Columbia and northwestern Alberta: diamonds, shallow gas, gravel, and glaciers.

2008 ◽  
Vol 45 (5) ◽  
pp. 509-512 ◽  
Author(s):  
Vic Levson
Keyword(s):  
British Columbia ◽  
Special Issue ◽  
Shallow Gas ◽  
Large Aggregate ◽  
Boreal Plains ◽  
Quaternary Stratigraphy ◽  
Kimberlite Indicator Minerals ◽  
Resource Exploration ◽  
Mapping Techniques ◽  
Indicator Minerals

This special issue reports on some of the results of a multi-disciplinary research program conducted in the Boreal Plains of northwest Alberta and northeast British Columbia. Several innovative approaches to conducting geoscientific research in this remote drift-covered region are presented, including geochemical analysis of bentonites for evaluating kimberlite potential, the use of electromagnetic surveys for mapping buried aggregate deposits, and paleo-topographic mapping techniques to define buried channels. Results of the program include the discovery of several large aggregate deposits, the first kimberlite indicator minerals in northeast British Columbia, a significant sphalerite dispersal train in northwest Alberta, the first documented report of kimberlite-sourced bentonites, and numerous previously unknown interglacial sites. Together these papers provide a greatly enhanced understanding of the glacial history, Quaternary stratigraphy, and kimberlite geology of northwest Alberta and northeast British Columbia and provide an improved framework for resource exploration in the region.

scholarly journals Late Pleistocene and Holocene vertebrates and palaeoenvironments from Charlie Lake Cave, northeast British Columbia

1988 ◽  
Vol 25 (10) ◽  
pp. 1545-1553 ◽  
Author(s):  
Jonathan C. Driver
Keyword(s):  
British Columbia ◽  
Late Pleistocene ◽  
Ground Squirrel ◽  
Lepus Americanus ◽  
Bison Bison ◽  
Snowshoe Hare ◽  
Climatic Fluctuations ◽  
Peace River ◽  
European Settlement ◽  
Cliff Swallow

Excavations outside Charlie Lake Cave, Peace River District, British Columbia, revealed deposits dating from ~10 700 BP to the present. The earliest fauna (10 700 – 10 000 BP) was deposited when the newly deglaciated landscape was largely unforested and included bison (Bison sp.), ground squirrel (Spermophilus sp.), a large hare (Lepus sp.), snowshoe hare (Lepus americanus), and a variety of birds, including the Cliff Swallow (Hirundo pyrrhonota). By 10 000 BP snowshoe hare (Lepus americanus) was the most numerous mammal, indicating the development of forested conditions. By 9000 BP the fauna resembled the modern Peace River fauna prior to European settlement, typical of a largely forested landscape, with wetland areas indicated by aquatic avian species. Subsequent Holocene climatic fluctuations are not evident in the faunal record.

Introduction: Affixes and bases

2011 ◽  
Vol 4 (2) ◽  
pp. 161-168
Author(s):  
Stela Manova
Keyword(s):  
Special Issue ◽  
Affix Order ◽  
Selection Of ◽  
Affix Ordering

This special issue includes a selection of papers presented at the 2nd Vienna Workshop on Affix Order held in Vienna, Austria on June 4–5, 2009. The workshop was in honor of Wolfgang U. Dressler on the occasion of his 70th birthday. However, this special issue differs from the classical Festschrift dedicated to a renowned scholar and is ‘more special’ in two respects at least: 1) not all authors are Dressler's friends and colleagues, some of them are only indirectly related to him, through his students; and 2) since the papers were presented at a topic-oriented workshop, they are thematically uniform. In other words, this special issue is a kind of scientific genealogy in terms of affix ordering. Thus, the title Affixes and bases should be understood in two ways: literally – affixes and bases as linguistic notions, and metaphorically – affixes and bases as linguists related directly and indirectly to a prominent base: Wolfgang U. Dressler.

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