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Copyright of Canadian Journal of Forest Research is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Botany is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Forest Research is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Multiproxy analysis of a 38 m long sediment core recovered from the Vancouver Island margin (48.97°N, 127.04°W, water depth 1243 m) has yielded a millennial-scale history of upwelling and export production over the last ~50 ka. Higher concentrations of marine organic carbon, opal, and trace Mo suggest that production was higher, and sedimentary pore waters more anoxic, during the warm Holocene, Bølling–Allerød, and interstadial events between 31 and 44 ka BP. Relatively lower production and higher inputs of terrigenous organic matter occurred during the last glacial (14.7–31 ka BP; Cordilleran ice sheet proximal to coring site at ~19.5 ka BP) and from 44–50.4 ka BP. Enrichments in sedimentary δ15N during interstadial events are interpreted to reflect episodic delivery and upwelling of isotopically heavy nitrate to the surface waters and subsequent vectoring to the seafloor via settling planktonic detritus. Similar patterns are seen in southern California and other areas along the western margin of North America, implying that heavier nitrate generated by denitrification in the Eastern Tropical North Pacific has in the past been carried northward in the California Undercurrent at least as far as central Vancouver Island. This inference is consistent with modern hydrographic observations in the region. Comparison of the coherent Vancouver Island, Oregon, California, and northwest Mexico margin records with late Pleistocene climate history in Greenland reinforces the conclusion that a tight physical and biogeochemical coupling has existed for at least 50 ka between the North Atlantic and North American margin waters, including those off Vancouver Island. Une analyse de multiples indicateurs substituts dans une carotte de sédiments de 38 m prélevée à la limite de l’île de Vancouver (48,97°N, 127,04°O, profondeur d’eau de 1243 m) a donné un historique d’échelle millénaire de remontée d’eau et de production au cours des derniers 50 milliers d’années. Des concentrations plus élevées de carbone organique marin, d’opale et de traces de Mo suggèrent une la production plus élevée et des eaux de pores sédimentaires plus anoxiques au cours de l’Holocène chaud, du Bølling–Allerød et des événements interstadiaires il y a entre 31 et 44 milliers d’années avant le présent (ka BP). Il y avait relativement moins de production et plus d’intrants de matière organique terrigène durant la dernière période glaciaire (14,7–31 ka BP; l’Inlandsis de la Cordillère était présent à proximité du site de carottage vers 19,5 ka BP) et de 44–50,4 ka BP. Des enrichissements en δ15N durant les événements interstadiaires sont interprétés comme le reflet de livraisons épisodiques et de la remontée de nitrate isotopiquement lourd vers les eaux de surface puis d’un cheminement vers le fond de l’océan avec les détritus de plancton. Des patrons similaires peuvent être constatés dans le sud de la Californie et à d’autres endroits le long de la bordure ouest de l’Amérique du Nord, impliquant que le nitrate plus lourd, généré par de la dénitrification dans l’Est tropical du Pacifique Nord, a jadis été porté vers le nord par le sous-courant de la Californie et s’est rendu au moins aussi loin que le centre de l’île de Vancouver. Cette inférence concorde avec les observations hydrographiques modernes dans la région. Une comparaison des données de bordure de l’île de Vancouver, de l’Oregon, de la Californie et du nord-ouest du Mexique, cohérentes avec l’historique climatique au Pléistocène tardif au Groenland, appuie la conclusion que, pour au moins 50 ka, il existait un jumelage physique et biogéochimique serré entre les eaux de bordure de l’Amérique du Nord et de l’Atlantique Nord, incluant les eaux au large de l’île de Vancouver. [ABSTRACT FROM AUTHOR]

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. Des sédiments colluviaux disséqués sur une terrasse de la rivière de la Paix, à Bear Flat, dans le nord-est de la Colombie-Britannique renfermaient une faunule micro-mammifère du Pléistocène tardif. Les restes fossiles, incluant quelques mandibules et crânes faiblement articulés, étaient dominés par des campagnols de la taïga (Microtus xanthognathus). Le site de Bear Flat constitue la seconde occurrence fossile de cette espèce problématique, laquelle est historiquement inconnue en Colombie-Britannique. L’âge Pléistocène tardif, déterminé par spectrométrie de masse par accélérateur directement sur le collagène des os de campagnols de la taïga, concorde avec les âges des nombreuses découvertes de campagnols de la taïga en bordure de l’Inlandsis laurentidien dans l’ouest, le centre-ouest et l’est de l’Amérique du Nord. La présence de restes allochrones à l’intérieur d’une séquence sédimentaire entièrement datée constitue une mise en garde contre l’acceptation pure et simple de la datation stratigraphique relative. [ABSTRACT FROM AUTHOR]

The eastern margin of the Kechika Graben in the vicinity of Muncho and Moose lakes, northeastern British Columbia, contains Middle Cambrian rift-related strata herein named the Mount Roosevelt Formation. The formation conformably overlies a quartzite package equivalent to the uppermost clastic unit of the informal late Early Cambrian Gataga group (Bonnia–Olenellus zone) and is conformably overlain by a thick, unnamed carbonate sequence of Middle Cambrian age (Plagiura–Poliella zone). The Mount Roosevelt Formation is subdivided into three members. The lowermost member is characterized by oöid-bearing siltstone and sandstone, interbedded with dolostone, limestone, and hematitic conglomerate. Conformably above this, the middle member is a thick sequence of polymict cobbly pebble conglomerate. The upper member includes karstified dolostone, calcareous-cemented conglomerate and sandstone, and limestone. Collectively the Mount Roosevelt Formation reflects alluvial fan delta progradation into a transgressive marine environment. Deposition occurred in an active fault-controlled basin, located on the eastern margin of the Kechika Graben adjacent to the Muskwa High. Basin initiation in the late Early Cambrian coincided with the reactivation of pre-existing regional faults. High rates of subsidence during the initial phase of extension were accommodated on these faults, which provided a locus for fan delta deposition. Continuing high rates of subsidence limited basinward fan delta development. Deposition of the formation ended with base-level transgression in the early Middle Cambrian that drowned the fan deltas and the adjacent Muskwa High and allowed development of the Kechika Trough above the older graben system. Située à proximité des lacs Muncho et Moose dans le nord-est de la Colombie-Britannique, la bordure est du graben de Kechika contient des strates, ici nommées la Formation de Mount Roosevelt (Cambrien moyen), qui sont reliées à la distension. La formation repose en concordance sur un ensemble de quartzite équivalent à l’unité supérieure, clastique, du groupe de Gataga, informel, datant du Cambrien précoce (zone à Bonnia–Olenellus); elle est recouverte en concordance par une épaisse séquence de carbonate, sans nom, datant du Cambrien moyen (zone à Plagiura–Poliella). La Formation de Mount Roosevelt est subdivisée en trois membres. Le membre inférieur est caractérisé par des siltstones et des grès à oolites, interstratifiés avec des dolomies, des calcaires, et des conglomérats hématitiques. Par-dessus, en concordance, le membre du centre est composé d’une épaisse séquence de conglomérat grenu, hétérogène et caillouteux. Le membre supérieur comprend de la dolomie karstifiée, du conglomérat et du grès à ciment calcaire, et du calcaire. Dans son ensemble, la Formation de Mount Roosevelt est le reflet de la progradation d’un delta alluvionnaire en un environnement marin de transgression. La déposition a eu lieu dans un bassin contrôlé par des failles actives situé sur la bordure est du graben de Kechika, voisin de la zone surélevée de Muskwa. L’amorce du bassin à la fin du Cambrien précoce coïncide avec la réactivation de failles régionales préexistantes. Au cours de la phase initiale d’extension, des taux élevés de subsidence ont été facilités sur ces failles, ce qui a fourni un endroit pour la déposition du delta alluvionnaire. Des taux de subsidence continuellement élevés ont limité le développement du delta alluvionnaire du côté du bassin. La déposition de la formation s’est terminée avec une transgression au niveau de la base au Cambrien moyen précoce, ce qui a ennoyé les deltas alluvionnaires et la zone avoisinante surélevée de Muskwa et a permis le développement de la fosse Kechika par-dessus l’ancien système de graben. [ABSTRACT FROM AUTHOR]

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Forest Research is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Forest Research is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To investigate the utility of short visits to seabird colonies to gauge nestling growth performance and diet, in four consecutive years from 1995 to 1998, the paper measures the nestling development and diet of rhinoceros auklets or cerorhinca monocerata at three colonies in British Columbia: Seabird Rocks, Triangle Island and SGaang Gwaii (Anthony Island).

The presence of Watinoceras reesidei Warren, Watinoceras coloradoense (Henderson), Watinoceras thompsonense Cobban, and Mytiloides mytiloides (Mantell) within the Tuskoola sandstone beds of the Vimy Member of the Kaskapau (Blackstone) Formation, places these strata within the lower Turonian stage of the Upper Cretaceous, within the Watinoceras reesidei Zone. International discoveries of Watinoceras in the United States, the Arctic, west Africa, northern Africa, Europe, and Asia, in the past fifty years has allowed the authors, while updating the stratigraphy and taxonomy, to refine correlation of the Tuskoola sandstone, a sandy facies of the "Second White Specks" horizon of Western Canada.La présence de Watinoceras reesidei Warren, Watinoceras coloradoense (Henderson), Watinoceras thompsonense Cobban et Mytiloides mytiloides (Mantell) dans les lits de grès de Tuskoola du membre Vimy de la Formation de Kaskapau (Blackstone), place ces strates à l'étage Turonien inférieur du Crétacé supérieur, à l'intérieur de la zone à Watinoceras reesidei. Des découvertes internationales de Watinoceras aux États-Unis, dans l'Arctique, en Afrique occidentale, en Afrique du Nord, en Europe et en Asie au cours des cinquante dernières années ont permis aux auteurs, tout en mettant à jour la stratigraphie et la taxonomie, de préciser la corrélation du grès de Tuskoola, un faciès gréseux de l'horizon « Second White Specks » de l'Ouest du Canada.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]

A new fauna of fossil marine reptiles is described from the Late Cretaceous Nanaimo Group of Vancouver Island. The fossils are from the Haslam and Pender formations (upper Santonian) near Courtenay, British Columbia, and include elasmosaurid plesiosaurs, turtles, and mosasaurs. This is only the second fauna of Late Cretaceous marine reptiles known from the Pacific Coast, the other being from the Moreno Formation of California (Maastrichtian). The new Nanaimo Group fossils are some 15 million years older than those from the Moreno Formation. However, like the California fauna, there are no polycotylid plesiosaurs, and one of the mosasaurs is a new genus. This reinforces the provinciality of the Pacific faunas and their isolation from contemporaneous faunas in the Western Interior Seaway.Une nouvelle faune de reptiles marins est décrite en provenance du Groupe de Nanaimo (Crétacé tardif) de l'île de Vancouver. Les fossiles proviennent des formations de Haslam et de Pender (Santonien supérieur), près de Courtenay, en Colombie-Britannique et ils comprennent des plésiosaures Elasmosauridae, des tortues et des mosasaures. Cette faune est seulement la deuxième de reptiles marins du Crétacé tardif connue sur la côte du Pacifique, l'autre provenant de la Formation de Moreno (Maastrichtien) en Californie. Les nouveaux fossiles du Groupe de Nanaimo sont quelque 15 millions d'années plus âgés que ceux de la formation de Moreno. Toutefois, tout comme la faune de la Californie, il n'y a pas de plésiosaures Polycotylidae et l'un des mosasaures représente un nouveau genre. Cela donne du poids à l'idée de provincialisme des faunes du Pacifique et leur isolation des faunes contemporaines de la « Western Interior Seaway ».[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]

The upper Middle Jurassic to Lower Cretaceous Relay Mountain Group is the lower part of the northern Tyaughton–Methow basin, southwestern British Columbia. The Relay Mountain Group consists of ~2700–3400 m of clastic rocks that we subdivide into three formal formations. The Callovian and lower Oxfordian Tyoax Pass Formation is marine shale and sandstone turbidites. The Teepee Mountain Formation consists of upper Oxfordian to Valanginian shallow marine clastic rocks with common Buchia and fluvial and marginal marine facies in the upper part of the unit in the northwest. These rocks overlie the lower formation across an abrupt conformable to disconformable contact. The Hauterivian (and Barremian?) Potato Range Formation consists of clastic rocks that are marine in the southeast, mainly nonmarine to the northwest, and derived from the west. This unit displays an abrupt conformable to disconformable contact with the middle formation and locally rests above the lower formation across an angular unconformity. The Relay Mountain Group and correlative strata of the southeastern Coast Belt form an overlap assemblage above the Bridge River and Cadwallader (including Methow) terranes and link them by late Middle Jurassic time. The early Relay Mountain Group appears to have been a fore-arc basin, possibly along an oblique–convergent margin in the middle unit. The upper unit indicates major changes to a back-arc basin linked to the Ottarasko, and possibly Gambier, arc to the west. This is the oldest probable link (~130 Ma) between the southeastern and southwestern Coast belts.Le Groupe de Relay Mountain (Jurassique moyen au Crétacé inférieur) forme la partie inférieure du bassin Tyaughton–Methow septentrional, dans le sud-ouest de la Colombie-Britannique. Le Groupe de Relay Mountain comprend ~2700–3400 m de roches clastiques que nous subdivisons en trois formations formelles. La Formation de Tyoax Pass, du Callovien et de l'Oxfordien inférieur, est formée de shales marins et de turbidites de grès. La Formation de Teepee Mountain comprend des roches clastiques marines d'eau peu profonde, de l'Oxfordien supérieur au Valanginien, dans lesquelles on retrouve fréquemment Buchia, et des faciès fluviaux et de bordure marine dans la partie supérieure de l'unité au nord-ouest. Ces roches reposent sur la formation inférieure chevauchant un contact abrupt concordant à non concordant. La Formation de Potato Range, du Hauterivien (et Barremien?), comprend des roches clastiques qui sont marines vers le sud-est, surtout non marines vers le nord-ouest et qui proviennent de l'ouest. Cette unité montre un contact abrupt concordant à non concordant avec la formation centrale et, par endroits, repose sur la formation inférieure en discordance angulaire. Le Groupe de Relay Mountain et les strates corrélatives de la ceinture côtière sud-est forment un assemblage de transgression au-dessus des terranes de Bridge River et de Cadwallader (incluant Methow) et les relient au Jurassique moyen tardif. Le Groupe de Relay Mountain initial semble avoir été un bassin d'avant-arc, possiblement le long d'une marge à convergence oblique dans l'unité centrale. L'unité supérieure indique des changements majeurs à un bassin d'arrière-arc relié à l'arc Ottarasko, et possiblement à l'arc Gambier, vers l'ouest. Cela représente le lien probable le plus ancien (~130 Ma) entre les ceintures côtières du sud-est et du sud-ouest.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]

The Cariboo Mountains, British Columbia, contain an intracontinental dextral strike-slip fault system that crosscuts the regional fold structures. This fault system accounts for a minimum of 120 km and a maximum of 200 km of dextral strike-slip displacement. This probably accommodates some of the motion associated with the southern termination of the Northern Rocky Mountain Trench Fault and is part of a step-over zone between the Northern Rocky Mountain Trench Fault and the Fraser River – Straight Creek fault systems. The Isaac Lake Synclinorium is a kilometre-scale Jurassic fold structure that is bounded by the dextral oblique Isaac Lake and Winder strike-slip faults. These faults are part of the regional strike-slip fault system that is found throughout the Cariboo Mountains. Deformation associated with the strike-slip faults is complex and is partitioned into motion along the faults and into the formation of kilometre-scale folds that are found in areas between the faults. The angular relationship between the strike-slip faults and folds conforms to models developed for dextral strike-slip fault systems with drag on high-friction faults. We interpreted these structures to have formed during a continuous deformation event. Timing constraints indicate that faulting started by the Late Cretaceous and may have had a long and protracted history into the Tertiary.La chaîne Cariboo, en Colombie-Britannique, possède un système intracontinental de failles décrochantes dextres qui recoupe les structures de pli régionales. Ce système de failles est responsable d'un déplacement horizontal dextre d'au moins 120 km et d'au plus 200 km. Il est aussi probablement responsable d'une partie du mouvement associé à l'extrémité sud de la faille du sillon des Rocheuses septentrionales et il fait partie de la zone empiétant sur la faille du sillon des Rocheuses septentrionales et les systèmes de failles Fraser River – Straight Creek. Le synclinorium de Isaac Lake est une structure de pli d'ordre kilométrique, datant du Jurassique; il est limité par les failles décrochantes dextres obliques de Isaac Lake et de Winder. Ces failles font partie du système de failles décrochantes régionales que l'on retrouve à travers toute la chaîne Cariboo. La déformation associée aux failles décrochantes est complexe et elle est répartie en mouvement le long des failles et en formation de plis d'échelle kilométrique qui se retrouvent dans certaines régions entre les failles. La relation angulaire entre les failles décrochantes et les plis est conforme aux modèles développés pour des systèmes de failles décrochantes dextres comportant du frottement pour les failles à coefficient de frottement élevé. Nous croyons que ces structures ont été formées au cours d'un événement de déformation continue. Les contraintes de temps indiquent que les failles ont débuté au Crétacé tardif et qu'elles ont pu avoir une longue histoire qui s'est prolongée jusqu'au Tertiaire.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]

The character of the Paleozoic basement of Quesnel Terrane and the position of the terrane accretion surface that separates Quesnel and Kootenay terranes from rocks of the ancient North American margin are subjects of debate. To address these problems, detailed mapping and U–Pb geochronologic studies were carried out in the Christina Lake area to define the relationship of the Mollie Creek assemblage, Josh Creek diorite, and Fife diorite to similar lithologies in the Greenwood – Grand Forks and Rossland regions, and to place limits on the ages of regional deformation and local position of the terrane accretion surface. Deformed metasedimentary rocks of the Mollie Creek assemblage may correlate with sedimentary rocks of the Pennsylvanian to Early Triassic Mount Roberts Formation in the Rossland area. The Mollie Creek assemblage is intruded by the foliated Late Triassic Josh Creek diorite. The Josh Creek diorite and Mollie Creek assemblage have been deformed together as a result of phase two deformation, following the intrusion of the Josh Creek diorite in the Late Triassic and prior to the intrusion of the Fife diorite and deposition of the overlying Rossland Group in the Early Jurassic. Based on relative age, structural position, and lithological similarities to other units within Quesnel Terrane, the Mollie Creek assemblage, Josh Creek diorite, and Fife diorite are a part of Quesnel Terrane and lie above the terrane accretion surface in the Christina Lake area. Therefore, Quesnel Terrane does not unconformably overlie basement rocks of known North American affinity in this region.Le caractère du socle paléozoïque du terrane de Quesnel et la position de la surface d'accrétion du terrane qui sépare les terranes de Quesnel et de Kootenay des roches de l'ancienne marge nord-américaine sont sujets à discussion. Afin d'aborder ces problèmes, de la cartographie de détail et des études géochronologiques U–Pb ont été entreprises dans la région du lac Christina afin de définir la relation entre l'assemblage de Mollie Creek, la diorite de Josh Creek, la diorite de Fife et des lithologies similaires dans les régions de Greenwood–Grand Forks et de Rossland et de circonscrire les âges de la déformation régionale ainsi que la position locale de la surface d'accrétion du terrane. Des roches métasédimentaires déformées de l'assemblage de Mollie Creek correspondent peut-être à des roches sédimentaires de la Formation de Mount Roberts (Pennsylvanien à Trias précoce) dans la région de Rossland. La diorite foliée de Josh Creek (Trias tardif) pénètre dans l'assemblage de Mollie Creek. La diorite de Josh Creek et l'assemblage de Mollie Creek ont été déformés ensemble à la suite d'une déformation de phase deux, après l'intrusion de la diorite de Josh Creek au Trias tardif et avant l'intrusion de la diorite de Fife et la déposition du Groupe de Rossland sus-jacent, au Jurassique précoce. Selon les âges relatifs, la position structurale et les similitudes lithologiques aux autres unités à l'intérieur du terrane de Quesnel, l'assemblage de Mollie Creek, la diorite de Josh Creek et la diorite de Fife font partie du terrane de Quesnel et reposent au-dessus de la surface d'accrétion du terrane dans la région du lac Christina. Le terrane de Quesnel ne repose donc pas en discordance sur les roches du socle d'affinité nord-américaine connue dans cette région.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]

The Spa Creek assemblage is a distinctive thin pericratonic succession that crosses the Okanagan Valley in the hinterland of the southern Cordilleran Orogen in Canada. The succession was ductilely deformed and metamorphosed before deposition of overlying Triassic dark metaclastic strata. A metaconglomerate within the succession, locally composed of more than 90% biotite granite clasts, yielded five fractions of euhedral zircon that define a precise U–Pb upper intercept of 555.6 ± 2.5 Ma, inferred to be the age of a nearby pluton. Other clasts in the metaconglomerate are generally more abundant, consisting of quartzite, amphibole schist, chlorite schist, sericite schist, biotite schist, and quartz–feldspar porphyry. They are likely host rocks of the pluton and, if so, are Late Proterozoic or older. The granite is interpreted as a terminal product of the Eocambrian rifting that preceded Paleozoic miogeoclinal sedimentation farther inboard. The continuity of pericratonic rocks west of the miogeocline and the occurrence of Proterozoic cratonic rocks at the surface west of the Okanagan Valley show that the ancient continental margin extends into a region where most of the crustal lithosphere was until now thought to consist of accreted Phanerozoic arc and accretionary complexes.L'assemblage de Spa Creek constitue une séquence distincte, mince et péri-cratonique qui recoupe la vallée de l'Okanagan dans l'arrière pays de l'orogène de la Cordillère sud, au Canada. La séquence a subi une déformation ductile et du métamorphisme avant d'être recouverte par les strates métaclastiques foncées du Trias. Un métaconglomérat à l'intérieur de la séquence, composé localement de plus de 90 % de fragments de granite à biotite, a donné cinq fractions de zircon automorphe qui définissent un paramètre cristallographique U–Pb supérieur précis de 555,6 ± 2,5 Ma, que l'on croit être l'âge d'un pluton avoisinant. D'autres fragments dans le métaconglomérat sont généralement plus abondants et comprennent du quartzite, du schiste à amphibole, du schiste à chlorite, du schiste à séricite, du schiste à biotite et des porphyres de quartz–feldspath. Ils sont probablement des roches encaissantes du pluton et, si c'est le cas, datent du Protérozoïque tardif ou sont plus anciens. Le granite serait un produit terminal d'une distension à l'Éocambrien qui a précédé la sédimentation miogéoclinale plus à l'intérieur. La continuité des roches péricratoniques à l'ouest du miogéocline et l'occurrence de roches cratoniques datant du Protérozoïque en surface, à ouest de la vallée de l'Okanagan, montrent que l'ancienne marge continentale s'étendait à l'intérieur d'une région où, jusqu'à présent, on croyait que la plus grande partie de la lithosphère crustale consistait de l'accrétion de complexes d'accrétion et de complexes d'arcs datant du Phanérozoïque.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]

New palynological data from peaty sediments deposited during the Port Moody Interstade, at about 18 000 [sup 14] C years, indicate that the environment in the western Fraser Lowland of British Columbia consisted of subalpine forest and parkland with abundant fir and spruce that grew under a temperate and moist climate, similar to the wetter subzones of the present-day Engelmann Spruce – Subalpine Fir biogeoclimatic zone. The moist conditions interpreted for the Port Moody Interstade are consistent with recent computer modelling and earlier palynological data from unglaciated western Washington State, but appear to contradict regional Cooperative Holocene Mapping Project (COHMAP) reconstructions and some earlier palaeoenvironmental studies that support dry conditions. Strong seasonality is suggested as part of the explanation, with Pacific storms in summer following the southern margin of the last Cordilleran ice sheet, bringing abundant moisture to the study area during the growing season, but probably not in winter, when storm tracks were displaced to the south. The cold and dry anticyclonic winds postulated by COHMAP were probably also relatively weak in summer, resulting in stronger expression of moist Pacific air masses than previously thought. The timing of the Port Moody Interstade coincides with that of a short climatic fluctuation reported from several other sites in both the northern and southern hemispheres. These events, if causally related, suggest a rapidly propagated atmospheric–oceanic signal.De nouvelles données palynologiques provenant de sédiments tourbeux déposés durant l'interstade de Port Moody, il y a environ 18 000 [sup 14] C années, indiquent, pour l'ouest des basses terres de la rivière Fraser en Colombie-Britannique, un environnement de forêt subalpine et de prairie-parc avec beaucoup de sapins et d'épinettes qui ont crû dans un climat tempéré et humide, semblable aux sous-zones plus humides de la présente zone biogéoclimatique de l'épinette Engelmann – sapin subalpin. Les conditions humides trouvées pour l'interstade de Port Moody concordent avec les récents modèles informatiques et les données palynologiques antérieures de l'ouest de l'État de Washington qui n'a pas subi la glaciation, mais elles semblent contredire les reconstructions régionales COHMAP et quelques études paléoenvironnementales antérieures qui supportaient des conditions sèches. De forts cycles saisonniers pourraient fournir une explication partielle : en été, des tempêtes dans le Pacifique suivent la limite sud du dernier inslandis de la Cordillère, amenant ainsi beaucoup d'humidité à la région sous étude durant la saison de croissance, mais probablement pas en hiver, alors que les trajectoires des tempêtes sont déplacées vers le sud. Les vents anticycloniques frais et secs postulés par COHMAP étaient aussi probablement relativement faibles en été, donnant plus de force aux masses d'air humide du Pacifique que ce qui avait été postulé antérieurement. L'interstade Port Moody coïncide avec une courte fluctuation climatique enregistrée à plusieurs autres sites dans les hémisphères nord et sud. Si ces événements sont reliés par une cause commune, cela suggère un signal atmosphère/océan qui a été rapidement propagé.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]

New U–Pb ages and K–Ar dates, primarily for rocks proximal to mineral occurrences in the Fawnie Range of central British Columbia, document latest Cretaceous (ca. 74–66 Ma) continental-arc igneous activity and date associated base and precious metal mineralization. U–Pb ages of ca. 73–69 Ma for the Capoose pluton and hypabyssal to extrusive garnet rhyolites at the Capoose prospect demonstrate a latest Cretaceous age for mineralization and a likely plutonic source for mineralizing fluids. A U–Pb age of ca. 67 Ma for a late mineralized felsic dyke and two K–Ar dates (ca. 70 and 68 Ma) for hornfelsed Jurassic volcanic rocks at the Blackwater–Davidson prospect constrain a latest Cretaceous age for mineralization. A U–Pb age of ca. 74 Ma for a fine grained diorite sill that cuts a significant epithermal gold vein at the Tsacha prospect places a minimum age on mineralization at this probable Jura-Cretaceous deposit and documents latest Cretaceous magmatism. Latest Cretaceous K–Ar dates are reported for an andesite flow adjacent to the Eocene Holy Cross deposit (ca. 66 Ma), about 35 km north of the Fawnie Range, and a Kasalka Group rhyolite (ca. 68 Ma) exposed near the western margin of the Nechako Plateau. Latest Cretaceous magmatism and mineralization in the Fawnie Range represent the waning stages of Bulkley suite magmatism and porphyry-style mineralization, which was concentrated along the western margin of the Nechako Plateau at circa 88–70 Ma. The distribution of latest Cretaceous arc igneous rocks along the North American Cordilleran is reviewed and tectonic implications discussed.De nouveaux âges U–Pb et de nouvelles datations K–Ar, surtout pour des roches à proximité d'occurrences minérales dans la chaîne Fawnie du centre de la Colombie-Britannique documentent la plus récente activité ignée d'arc continental au Crétacé (ca. 74–66 Ma) et datent la minéralisation associée de métaux précieux et de métaux de base. Des âges U–Pb d'environ 73–69 Ma pour le pluton de Capoose et les rhyolites grenatifères hypabyssales à extrusives dans la zone d'intérêt Capoose démontrent un âge Crétacé terminal pour la minéralisation et une source plutonique probable pour les fluides minéralisateurs. Un âge U–Pb d'environ 67 Ma pour un dyke felsique à minéralisation tardive et deux datations K–Ar (ca. 70 et 68 Ma) pour des roches volcaniques au faciès des cornéennes, datant du Jurassique, à la zone d'intérêt Blackwater–Davidson limitent l'âge de la minéralisation au Crétacé terminal. Un âge U–Pb d'environ 74 Ma pour un filon-couche de diorite à grains fins qui recoupe une importante veine d'or épithermale à la zone d'intérêt Tsacha donne un âge minimum pour la minéralisation de ce dépôt, probablement au Jurassique–Crétacé, et documente le magmatisme au Crétacé terminal. Des datations K–Ar de Crétacé terminal sont rapportées pour un écoulement d'andésite adjacent au gisement de Holy Cross, datant de l'Éocène (ca. 66 MA), situé à environ 35 km au nord de la chaîne Fawnie et pour une rhyolite du Groupe de Kasalka (ca. 68 Ma) affleurant près de la bordure ouest du plateau Nechako. Du magmatisme et de la minéralisation dans la chaîne Fawnie, au Crétacé terminal, représentent les dernières phases du magmatisme de la suite Bulkley et de la minéralisation de type porphyrique, qui a été concentrée le long de la bordure ouest du plateau Nechako il y a environ 88–70 Ma. On passe en revue la distribution des roches ignées d'arc au Crétacé terminal le long de la Cordillère nord-américaine et on discute des implications tectoniques.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]

The Quaternary stratigraphy of the Nechako River – Cheslatta Lake area of central British Columbia is described and interpreted to reconstruct the late Quaternary history of the region. Exposures of glacial and nonglacial sediments deposited prior to the last glaciation (Fraser) are limited to three sites. Pollen assemblages from pre-Fraser nonglacial sediments at two of these sites reveal forested conditions around 39 000 BP. During the advance phase of the Fraser Glaciation, glacial lakes were ponded when trunk glaciers blocked some tributary valleys. Early in the glaciation, the drainage was free in easterly draining valleys. Subsequently, the easterly drainage was blocked either locally by sediments and ice or as a result of impoundment of the Fraser River and its tributaries east of the study area. Ice generally moved east and northeast from accumulation zones in the Coast Mountains. Ice flow was influenced by topography. Major late-glacial lakes developed in the Nechako River valley and the Knewstubb Lake region because potential drainage routes were blocked by ice.La stratigraphie du Quaternaire de la région de la rivière Nechako et du lac Cheslatta sise au centre de la Colombie Britannique est décrite et interprétée dans le but de reconstruire l'histoire du Quaternaire tardif de cette région. Seul trois coupes stratigraphiques mettent en évidence des sédiments glaciaires et non-glaciaires mis en place avant la dernière glaciation (Fraser). À deux sites, l'assemblage pollinique des sédiments non-glaciaires prédatant la Glaciation de Fraser reflète un environnement forestier aux environs de 39 000 BP. Lors de l'avancée des glaciers au début de la Glaciation de Fraser, des lacs glaciaires furent retenus dans les vallées secondaires par les glaciers qui occupaient les vallées primaires. Au début de cette glaciation, le drainage vers l'est fut tout d'abord ouvert mais subséquemment, il fut bloqué soit localement par des sédiments et de la glace ou en raison du blocage du fleuve Fraser et ses tributaires à l'est de la région d'étude. Les glaciers se sont écoulés vers l'est et le nord-est à partir de zones d'accumulation centrées sur la Chaîne Côtière. Les écoulements glaciaires furent influencés par la topographie. Des lacs post-glaciaires se sont formés dans la vallée de la rivière Nechako et dans la région du lac Knewstubb suite au blocage du drainage potentiel par la glace.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]

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