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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Bhiry, Najat; Joyal-Fortier, Maggie; Centre d'études nordiques, (CEN);

    Cette étude consiste en des analyses lithostratigraphiques, sédimentologiques (granulométrie) et minéralogiques du paléodelta de la rivière Svalbarðsa (nord-est de l'Islande). La coupe étudiée faisant partie de ce delta, présente une alternance de deux types de couches sédimentaires : 1) couches formées de sédiments fins silteux laminés de couleur pâle; les minéraux incluent l'augite, l'albite, l'andésite, la diopside, la montmorillonite, le talc et la nontronite; 2) couches composées de sable fin de couleur brun foncé formée de minéraux à susceptibilité magnétique. Cet ensemble de 450 cm d'épaisseur est surmonté de sable grossier et de gravier fin rougeâtre à stratification horizontale ou entrecroisée d'origine fluviatile. L'alternance des couches de sédiments a été associée à des changements au niveau de la fonte de la langue glaciaire qui occupait la vallée Svalbarðtunga. Suite à une phase de réavancée glaciaire, des périodes de recul et de stagnation auraient succédé entrainant ainsi un changement dans la dynamique et le débit de la rivière Svalbarðsa, et ses affluents (p. ex. Tunga). Les phases de recul, suite à une fonte importante du glacier, sont associées à des évènements catastrophiques tels les « jökulhaups ». L'environnement sédimentaire deltaïque s'est transformé par la suite à un environnement fluviatiles à fort débit.

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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Foury, Yann; Bhiry, Najat; Woollett, James;

    Two field campaigns took place in summers 2014 and 2015 which gave the opportunity to resume House 2 and House 1 middens excavations. New stratigraphic analyses were realized. The previous excavation areas were extend of 4,15 m² for House 2 midden and 1 m² for House 1 midden. Moreover, 25 samples of soil/sediments were taken using Kübiena boxes of 10 cm3, for micromorphological analyses. These samples were sent to the Laboratory of micromorphology of Laval University. There, they are ovendried and impregnated with polyester resin. Then, samples were sliced and polished into 30 µm thin section. Finally, they were analysed under a polarised microscope. Around 3500 bones were removed and sent to the Laboratory of Bioarchaeology and Prehistoric Archaeology of Laval University. They were identified with the help of comparative osteological collections. Seal species were identified solely on the humerus, maxilla, auditory bulla and mandibles. The NABONE zooarchaeological analysis package was used to store and manipulate basic quantitative data. Until now, 1746 bones from both middens and 15 micromorphological thin sections were analyzed. Thin sections of seal canines will be realized to estimate seal age and season of death by microscopic analysis.

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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Federated Research D...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Bhiry, Najat; Couture, Andréanne; Woollett, James;

    Undisturbed oriented archaeological sediment samples were retrieved from the interior of three communal semisubterranean sod houses using steel Kubiëna boxes (10 cm3). The sampling strategy was aimed at obtaining a micromorphological portrait of each activity carried out within the communal house. The primary areas of interest were the following: sleeping platform, floor, lampstand, and entrance tunnel. We sought to determine if we could demarcate activity areas based on soil microstructure and pedofeatures. At House 1 (in Oakes Bay 1), two samples were taken using Kubiëna boxes: one from the floor (F) and one from the tunnel (T). At House 2 (in Oakes Bay 1), two Kubiëna boxes were extracted from the sleeping platform (PF) and a third one from the area between the sleeping platform and the floor (PF/F). We also removed two boxes from the floor (F), one from the lampstand (L) (which lay above the stone floor) and one from the entrance tunnel (T). At House 7 (in Uivak Point), two boxes were extracted from the sleeping platform, two at the edge of the sleeping platform, and one from the entrance tunnel (Figure 5). All of these sections were selected for sampling based on the evidence provided by archaeological interpretations (e.g. Woollett, 2003, 2010). Fourteen thin sections (5 cm × 7.5 cm) were prepared at Brock University (Ontario, Canada) using conventional methods (Guillore, 1985). The samples were oven-dried, impregnated with polyester resin, and then sliced into 30-um-thick sections. The thin sections were analyzed using a Leica DM-4500 polarized microscope in planepolarized light (PPL), crossed-polarized light (XPL), and oblique-incident light (OIL) at the microscopy laboratory of the Centre d'études nordiques (Québec, Laval University). The thin sections were described following Bullock et al. (1985), Fitzpatrick (1993), Vliet-Lanoë (1985), and Courty , Goldberg, and Macphail (1989). Micromorphological analysis focused primarily on anthropogenic features, but mineral and organic components associated with biopedological features and cryopedological processes were also documented.

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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Bryan Martin, Memorial University; Rod Smith, Geological Survey-NRCan and Memorial University; Trevor Bell, Memorial University;

    The inundation basin approach to sea level reconstruction relies on the accurate determination of the former height of the basin sill over which the marine water flooded. The methods used include percussion coring and vibracoring of sill and basin sediments. The locations were determined using previously obtained water depths and aerial photographs. Cores were obtained from a sea ice platform after having augered through the ice and taking point measurements for depth by lead line. Cores were stored upright and unfrozen where they were then shipped to GSC Atlantic for logging and subsampling.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Federated Research D...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Federated Research D...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Daniel Fortier; Eva Stephani; Richard Fortier;

    The geophysical surveys included ground-penetrating radar (GPR) (100 MHz-antenna) and EM-resistivity. Three longitudinal transects over the road surface were completed with the Gem-2 (EM-resistivity apparatus) and the Pulse-Ekko Pro (GPR). Two longitudinal transects at the toe of the road slopes were completed with the GPR. One of this transect extended from sub-section YG1 to YG9 on the northern side of the road while the other transect was located from sub-section YG10 to YG12 on the southern side of the road. Twelve transversal transects of the sub-sections, which extended in the natural ground adjacent to the sub-sections, were conducted with the GPR.

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Daniel Fortier; Coulombe, Stéphanie; Guillaume St-Onge; Guertin-Pasquier, Alexandre;

    Ce jeu de donnée présente une compilation de données paléomagnétiques provenant de séquences sédimentaires glacigènes étudiées à l'île Bylot (Nunavut). Des échantillons discrets de sédiments ont été prélevés à partir de trois sections stratigraphiques non perturbées (A, B, C) afin de déterminer l'âge des sédiments et de la glace de glacier enfouie dans le pergélisol. Le paléomagnétisme est une technique de datation relative qui est basée l'enregistrement des variations du champ magnétique terrestre dans les roches et les sédiments. Les analyses ont été réalisées au Laboratoire de recherche en Paléomagnétisme et Géologie marine de l'Institut des sciences de la mer de Rimouski (ISMER, Rimouski, QC). This dataset presents a compilation of paleomagnetic records from glacigenic sedimentary sequences studied on Bylot Island (Nunavut). Discrete sediment samples were collected from three undisturbed stratigraphic sections (A, B, C) to constrain the age of the sediment and buried glacier ice preserved in the permafrost. Paleomagnetism is a relative dating technique based on the principle that changes in the Earth's magnetic field are preserved in rocks and sediments. Paleomagnetic measurements were carried out at the Paleomagnetism and Marine geology Laboratory at the Institut des sciences de la mer de Rimouski (ISMER, Rimouski, QC).

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Daniel Fortier; Eva Stephani;

    Drilling and coring operations at Beaver Creek test site have been conducted in August 2007 and June 2008. 39 boreholes (up to 15 m deep) were done in the natural ground adjacent to the road as well as thru the road material at the centerline and on the side slopes. All permafrost cores retrieved (10 cm-diameter) were described in details in terms of the assemblage of sediments, organic matter and cryostructure. The assemblages of sediments with cryostructures determined the cryofacies, and the cryofacies assemblages determined the cryostratigraphy at Beaver Creek site. The data include description and photograph for each core retrieved.

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    Authors: Daniel Fortier, Professor, Geography dep. University of Montreal, daniel.fortier@umontreal.ca; Michel Paquette, undergraduate honor student, University of Montreal, paquetmic@hotmail.com;

    Surface deposits were sampled along a 150m transect across a valley north of the village of Kangirsuk. Seven excavations were performed using a shovel to the thawing front (<2m). The stratigraphy was described and 23 samples were collected for grain-size analysis using sieves and hydrometers. Grain-size statistics were computed using the moment method and the Graphic method (Folk and Ward, 1957) using the Gradistat v7.0 excel calculation sheet (Blott and Pye, 2001). The stratigraphic and sedimentological data are used in high-resolution 3D based GIS to produce detailed maps of surfical deposits. The data were analyzed in terms of depositional environments. AMS dating of Mya Truncata shells will provide a minimal age for this major step in the marine regression of the Kangirsuk area and will contribute to improve regional sea level curves.

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    Authors: Guertin, Alexandre; Fortier, Daniel;

    The fieldwork consisted of excavating stratigraphic exposures (up to 5 meters height) in the permafrost. These sections were excavated to clarify the depositional sequences that occurred during the Plio-Pleistocene boundary. For stratigraphic exposures, detailed (cm) sedimentological and stratigraphic descriptions were done in order to reconstruct the depositional environments. Boreholes were also drilled with a permafrost core drill to reach deeper strata. This excavation work was combined with large scale stratigraphic characterization of the study site with a differential GPS. The DGPS was also used to geo-reference the bedrock at the study site for a better imaging of the local physiography at the time of tree growth. Samples were collected for laboratory pollen and grain-size distribution analyses to precise the depositional environment and vegetation assemblages. All the data will be integrated into a geographic information system and analyzed with pollen (C2 and Tilia) and sedimentology analysis software (Gradistat). Along the stratigraphic exposures, we collected sediment samples for paleomagnetism analyses to ascertain the chrono-stratigraphic framework. The analyses were made with a cryogenic magnetometer at the Sedimentary Paleomagnetism Laboratory (UQAM). Wood pieces were also collected for future macro-fossil/tree ring analyses. The majority of these pieces were very well preserved and some still had bark on them.

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    Authors: Fortier, Daniel; Guertin, Alexandre;

    The fieldwork consisted of excavating stratigraphic exposures (up to 5 meters height) inside the permafrost. These sections were excavated to clarify the depositional sequences that occurred during the Plio-Pleistocene boundary. For stratigraphic exposures, detailed (cm) sedimentological and stratigraphic descriptions were done in order to reconstruct the depositional environments. Boreholes were also drilled with a permafrost core drill to reach deeper strata. This excavation work was combined with large scale stratigraphic characterization of the study site with a differential GPS. The DGPS was also used to geo-reference the bedrock at the study site for a better imaging of the local physiography at the time of tree growth. Samples were also collected for laboratory pollen and grain-size distribution analyses to precise the depositional environment and vegetation assemblages. All the data will be after integrated into a geographic information system and analyzed with a pollen (C2 and Tilia) and sedimentology analysis software (Gradistat). Wood pieces were also collected for future macro-fossil/tree ring analyses. The majority of these pieces were very well preserved and some still had bark on them. Finally, along the stratigraphic exposures, we also collected sediment samples for paleomagnetism analyses to ascertain the chrono-stratigraphic framework. The analyses were made with a cryogenic magnetometer at the Sedimentary Paleomagnetism Laboratory (UQAM).

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Bhiry, Najat; Joyal-Fortier, Maggie; Centre d'études nordiques, (CEN);

    Cette étude consiste en des analyses lithostratigraphiques, sédimentologiques (granulométrie) et minéralogiques du paléodelta de la rivière Svalbarðsa (nord-est de l'Islande). La coupe étudiée faisant partie de ce delta, présente une alternance de deux types de couches sédimentaires : 1) couches formées de sédiments fins silteux laminés de couleur pâle; les minéraux incluent l'augite, l'albite, l'andésite, la diopside, la montmorillonite, le talc et la nontronite; 2) couches composées de sable fin de couleur brun foncé formée de minéraux à susceptibilité magnétique. Cet ensemble de 450 cm d'épaisseur est surmonté de sable grossier et de gravier fin rougeâtre à stratification horizontale ou entrecroisée d'origine fluviatile. L'alternance des couches de sédiments a été associée à des changements au niveau de la fonte de la langue glaciaire qui occupait la vallée Svalbarðtunga. Suite à une phase de réavancée glaciaire, des périodes de recul et de stagnation auraient succédé entrainant ainsi un changement dans la dynamique et le débit de la rivière Svalbarðsa, et ses affluents (p. ex. Tunga). Les phases de recul, suite à une fonte importante du glacier, sont associées à des évènements catastrophiques tels les « jökulhaups ». L'environnement sédimentaire deltaïque s'est transformé par la suite à un environnement fluviatiles à fort débit.

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    Authors: Foury, Yann; Bhiry, Najat; Woollett, James;

    Two field campaigns took place in summers 2014 and 2015 which gave the opportunity to resume House 2 and House 1 middens excavations. New stratigraphic analyses were realized. The previous excavation areas were extend of 4,15 m² for House 2 midden and 1 m² for House 1 midden. Moreover, 25 samples of soil/sediments were taken using Kübiena boxes of 10 cm3, for micromorphological analyses. These samples were sent to the Laboratory of micromorphology of Laval University. There, they are ovendried and impregnated with polyester resin. Then, samples were sliced and polished into 30 µm thin section. Finally, they were analysed under a polarised microscope. Around 3500 bones were removed and sent to the Laboratory of Bioarchaeology and Prehistoric Archaeology of Laval University. They were identified with the help of comparative osteological collections. Seal species were identified solely on the humerus, maxilla, auditory bulla and mandibles. The NABONE zooarchaeological analysis package was used to store and manipulate basic quantitative data. Until now, 1746 bones from both middens and 15 micromorphological thin sections were analyzed. Thin sections of seal canines will be realized to estimate seal age and season of death by microscopic analysis.

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    Authors: Bhiry, Najat; Couture, Andréanne; Woollett, James;

    Undisturbed oriented archaeological sediment samples were retrieved from the interior of three communal semisubterranean sod houses using steel Kubiëna boxes (10 cm3). The sampling strategy was aimed at obtaining a micromorphological portrait of each activity carried out within the communal house. The primary areas of interest were the following: sleeping platform, floor, lampstand, and entrance tunnel. We sought to determine if we could demarcate activity areas based on soil microstructure and pedofeatures. At House 1 (in Oakes Bay 1), two samples were taken using Kubiëna boxes: one from the floor (F) and one from the tunnel (T). At House 2 (in Oakes Bay 1), two Kubiëna boxes were extracted from the sleeping platform (PF) and a third one from the area between the sleeping platform and the floor (PF/F). We also removed two boxes from the floor (F), one from the lampstand (L) (which lay above the stone floor) and one from the entrance tunnel (T). At House 7 (in Uivak Point), two boxes were extracted from the sleeping platform, two at the edge of the sleeping platform, and one from the entrance tunnel (Figure 5). All of these sections were selected for sampling based on the evidence provided by archaeological interpretations (e.g. Woollett, 2003, 2010). Fourteen thin sections (5 cm × 7.5 cm) were prepared at Brock University (Ontario, Canada) using conventional methods (Guillore, 1985). The samples were oven-dried, impregnated with polyester resin, and then sliced into 30-um-thick sections. The thin sections were analyzed using a Leica DM-4500 polarized microscope in planepolarized light (PPL), crossed-polarized light (XPL), and oblique-incident light (OIL) at the microscopy laboratory of the Centre d'études nordiques (Québec, Laval University). The thin sections were described following Bullock et al. (1985), Fitzpatrick (1993), Vliet-Lanoë (1985), and Courty , Goldberg, and Macphail (1989). Micromorphological analysis focused primarily on anthropogenic features, but mineral and organic components associated with biopedological features and cryopedological processes were also documented.

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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Bryan Martin, Memorial University; Rod Smith, Geological Survey-NRCan and Memorial University; Trevor Bell, Memorial University;

    The inundation basin approach to sea level reconstruction relies on the accurate determination of the former height of the basin sill over which the marine water flooded. The methods used include percussion coring and vibracoring of sill and basin sediments. The locations were determined using previously obtained water depths and aerial photographs. Cores were obtained from a sea ice platform after having augered through the ice and taking point measurements for depth by lead line. Cores were stored upright and unfrozen where they were then shipped to GSC Atlantic for logging and subsampling.

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    Authors: Daniel Fortier; Eva Stephani; Richard Fortier;

    The geophysical surveys included ground-penetrating radar (GPR) (100 MHz-antenna) and EM-resistivity. Three longitudinal transects over the road surface were completed with the Gem-2 (EM-resistivity apparatus) and the Pulse-Ekko Pro (GPR). Two longitudinal transects at the toe of the road slopes were completed with the GPR. One of this transect extended from sub-section YG1 to YG9 on the northern side of the road while the other transect was located from sub-section YG10 to YG12 on the southern side of the road. Twelve transversal transects of the sub-sections, which extended in the natural ground adjacent to the sub-sections, were conducted with the GPR.

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    Authors: Daniel Fortier; Coulombe, Stéphanie; Guillaume St-Onge; Guertin-Pasquier, Alexandre;

    Ce jeu de donnée présente une compilation de données paléomagnétiques provenant de séquences sédimentaires glacigènes étudiées à l'île Bylot (Nunavut). Des échantillons discrets de sédiments ont été prélevés à partir de trois sections stratigraphiques non perturbées (A, B, C) afin de déterminer l'âge des sédiments et de la glace de glacier enfouie dans le pergélisol. Le paléomagnétisme est une technique de datation relative qui est basée l'enregistrement des variations du champ magnétique terrestre dans les roches et les sédiments. Les analyses ont été réalisées au Laboratoire de recherche en Paléomagnétisme et Géologie marine de l'Institut des sciences de la mer de Rimouski (ISMER, Rimouski, QC). This dataset presents a compilation of paleomagnetic records from glacigenic sedimentary sequences studied on Bylot Island (Nunavut). Discrete sediment samples were collected from three undisturbed stratigraphic sections (A, B, C) to constrain the age of the sediment and buried glacier ice preserved in the permafrost. Paleomagnetism is a relative dating technique based on the principle that changes in the Earth's magnetic field are preserved in rocks and sediments. Paleomagnetic measurements were carried out at the Paleomagnetism and Marine geology Laboratory at the Institut des sciences de la mer de Rimouski (ISMER, Rimouski, QC).

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    Authors: Daniel Fortier; Eva Stephani;

    Drilling and coring operations at Beaver Creek test site have been conducted in August 2007 and June 2008. 39 boreholes (up to 15 m deep) were done in the natural ground adjacent to the road as well as thru the road material at the centerline and on the side slopes. All permafrost cores retrieved (10 cm-diameter) were described in details in terms of the assemblage of sediments, organic matter and cryostructure. The assemblages of sediments with cryostructures determined the cryofacies, and the cryofacies assemblages determined the cryostratigraphy at Beaver Creek site. The data include description and photograph for each core retrieved.

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    Authors: Daniel Fortier, Professor, Geography dep. University of Montreal, daniel.fortier@umontreal.ca; Michel Paquette, undergraduate honor student, University of Montreal, paquetmic@hotmail.com;

    Surface deposits were sampled along a 150m transect across a valley north of the village of Kangirsuk. Seven excavations were performed using a shovel to the thawing front (<2m). The stratigraphy was described and 23 samples were collected for grain-size analysis using sieves and hydrometers. Grain-size statistics were computed using the moment method and the Graphic method (Folk and Ward, 1957) using the Gradistat v7.0 excel calculation sheet (Blott and Pye, 2001). The stratigraphic and sedimentological data are used in high-resolution 3D based GIS to produce detailed maps of surfical deposits. The data were analyzed in terms of depositional environments. AMS dating of Mya Truncata shells will provide a minimal age for this major step in the marine regression of the Kangirsuk area and will contribute to improve regional sea level curves.

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    Authors: Guertin, Alexandre; Fortier, Daniel;

    The fieldwork consisted of excavating stratigraphic exposures (up to 5 meters height) in the permafrost. These sections were excavated to clarify the depositional sequences that occurred during the Plio-Pleistocene boundary. For stratigraphic exposures, detailed (cm) sedimentological and stratigraphic descriptions were done in order to reconstruct the depositional environments. Boreholes were also drilled with a permafrost core drill to reach deeper strata. This excavation work was combined with large scale stratigraphic characterization of the study site with a differential GPS. The DGPS was also used to geo-reference the bedrock at the study site for a better imaging of the local physiography at the time of tree growth. Samples were collected for laboratory pollen and grain-size distribution analyses to precise the depositional environment and vegetation assemblages. All the data will be integrated into a geographic information system and analyzed with pollen (C2 and Tilia) and sedimentology analysis software (Gradistat). Along the stratigraphic exposures, we collected sediment samples for paleomagnetism analyses to ascertain the chrono-stratigraphic framework. The analyses were made with a cryogenic magnetometer at the Sedimentary Paleomagnetism Laboratory (UQAM). Wood pieces were also collected for future macro-fossil/tree ring analyses. The majority of these pieces were very well preserved and some still had bark on them.

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    Authors: Fortier, Daniel; Guertin, Alexandre;

    The fieldwork consisted of excavating stratigraphic exposures (up to 5 meters height) inside the permafrost. These sections were excavated to clarify the depositional sequences that occurred during the Plio-Pleistocene boundary. For stratigraphic exposures, detailed (cm) sedimentological and stratigraphic descriptions were done in order to reconstruct the depositional environments. Boreholes were also drilled with a permafrost core drill to reach deeper strata. This excavation work was combined with large scale stratigraphic characterization of the study site with a differential GPS. The DGPS was also used to geo-reference the bedrock at the study site for a better imaging of the local physiography at the time of tree growth. Samples were also collected for laboratory pollen and grain-size distribution analyses to precise the depositional environment and vegetation assemblages. All the data will be after integrated into a geographic information system and analyzed with a pollen (C2 and Tilia) and sedimentology analysis software (Gradistat). Wood pieces were also collected for future macro-fossil/tree ring analyses. The majority of these pieces were very well preserved and some still had bark on them. Finally, along the stratigraphic exposures, we also collected sediment samples for paleomagnetism analyses to ascertain the chrono-stratigraphic framework. The analyses were made with a cryogenic magnetometer at the Sedimentary Paleomagnetism Laboratory (UQAM).

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