Search Results - "Froese, D G"

Volcanic ash layers in Lake El'gygytgyn: eight new regionally significant chronostratigraphic markers for western Beringia by van den Bogaard, C, Jensen, B. J. L, Pearce, N. J. G, Froese, D. G, Portnyagin, M. V, Ponomareva, V. V, Wennrich, V

“…Ash layers from explosive volcanic eruptions (i.e., tephra) represent isochronous surfaces independent from the environment in which they are deposited and the…”
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Characterizing large river history with shallow geophysics: Middle Yukon River, Yukon Territory and Alaska by Froese, Duane G., Smith, Derald G., Clement, David T.

“…Changes in longitudinal valley-fill thickness can provide inferences about fluvial behaviour over millennia. Increased thickness of channel deposits may reveal…”
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Electrical resistivity ground imaging (ERGI): a new tool for mapping the lithology and geometry of channel-belts and valley-fills by Baines, Dave, Smith, Derald G., Froese, Duane G., Bauman, Paul, Nimeck, Grant

“…Efforts to map the lithology and geometry of sand and gravel channel‐belts and valley‐fills are limited by an inability to easily obtain information about the…”
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Catastrophic Drainage From the Northwestern Outlet of Glacial Lake Agassiz During the Younger Dryas by Norris, S. L., Garcia‐Castellanos, D., Jansen, J. D., Carling, P. A., Margold, M., Woywitka, R. J., Froese, D. G.

“…Catastrophic meltwater drainage from glacial Lake Agassiz has been hypothesized as a trigger for large‐scale ocean circulation change initiating the Younger…”
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The INTAV intercomparison of electron-beam microanalysis of glass by tephrochronology laboratories: Results and recommendations by Kuehn, S.C., Froese, D.G., Shane, P.A.R.

“…The INternational focus group on Tephrochronology And Volcanism (INTAV) of the International Union for Quaternary Research (INQUA) has conducted an…”
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Ancient horse genomes reveal the timing and extent of dispersals across the Bering Land Bridge by Vershinina, Alisa O., Heintzman, Peter D., Froese, Duane G., Zazula, Grant, Cassatt‐Johnstone, Molly, Dalén, Love, Der Sarkissian, Clio, Dunn, Shelby G., Ermini, Luca, Gamba, Cristina, Groves, Pamela, Kapp, Joshua D., Mann, Daniel H., Seguin‐Orlando, Andaine, Southon, John, Stiller, Mathias, Wooller, Matthew J., Baryshnikov, Gennady, Gimranov, Dmitry, Scott, Eric, Hall, Elizabeth, Hewitson, Susan, Kirillova, Irina, Kosintsev, Pavel, Shidlovsky, Fedor, Tong, Hao‐Wen, Tiunov, Mikhail P., Vartanyan, Sergey, Orlando, Ludovic, Corbett‐Detig, Russell, MacPhee, Ross D., Shapiro, Beth

“…The Bering Land Bridge (BLB) last connected Eurasia and North America during the Late Pleistocene. Although the BLB would have enabled transfers of terrestrial…”
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Dynamical response of the southwestern Laurentide Ice Sheet to rapid Bølling–Allerød warming by Norris, Sophie L, Margold, Martin, Evans, David J. A, Atkinson, Nigel, Froese, Duane G

“…The shift in climate that occurred between the Last Glacial Maximum (LGM) and the Early Holocene (ca. 18–12 kyr BP) displayed rates of temperature increase…”
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Last Glacial Maximum age for the northwest Laurentide maximum from the Eagle River spillway and delta complex, northern Yukon by Kennedy, K.E., Froese, D.G., Zazula, G.D., Lauriol, B.

“…The Eagle River spillway and braid delta complex provide a record of the maximum extent of the northwest Laurentide Ice Sheet and diversion of meltwater from…”
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Old Crow tephra across eastern Beringia: a single cataclysmic eruption at the close of Marine Isotope Stage 6 by Preece, S.J., Pearce, N.J.G., Westgate, J.A., Froese, D.G., Jensen, B.J.L., Perkins, W.T.

“…Old Crow tephra is the largest and most widespread Quaternary eruption presently known in eastern Beringia. Its major- and trace-element geochemistry, Fe-Ti…”
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Optically stimulated luminescence dating of single and multiple grains of quartz from perennially frozen loess in western Yukon Territory, Canada: Comparison with radiocarbon chronologies for the late Pleistocene Dawson tephra by Demuro, M., Roberts, R.G., Froese, D.G., Arnold, L.J., Brock, F., Ramsey, C.Bronk

“…Optically stimulated luminescence (OSL) dating of perennially frozen loess was tested on quartz grains extracted from deposits associated with the late…”
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Changing ideas on the identity and stratigraphic significance of the Sheep Creek tephra beds in Alaska and the Yukon Territory, northwestern North America by Westgate, J.A., Preece, S.J., Froese, D.G., Pearce, N.J.G., Roberts, R.G., Demuro, M., Hart, W.K., Perkins, W.

“…Sheep Creek tephra (SCt) consists of inflated, rhyolitic pumice with abundant plagioclase and hornblende, lesser amounts of ferrian ilmenite and magnetite, and…”
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Stable Carbon Isotope Compositions of Eastern Beringian Grasses and Sedges: Investigating Their Potential as Paleoenvironmental Indicators by Wooller, Matthew J, Zazula, Grant D, Edwards, Mary, Froese, Duane G, Boone, Richard D, Parker, Carolyn, Bennett, Bruce

“…The nature of vegetation cover present in Beringia during the last glaciation remains unclear. Uncertainty rests partly with the limitations of conventional…”
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Rise and Fall of the Beringian Steppe Bison by Shapiro, Beth, Drummond, Alexei J., Rambaut, Andrew, Wilson, Michael C., Matheus, Paul E., Sher, Andrei V., Pybus, Oliver G., M. Thomas P. Gilbert, Barnes, Ian, Binladen, Jonas, Willerslev, Eske, Hansen, Anders J., Baryshnikov, Gennady F., Burns, James A., Davydov, Sergei, Driver, Jonathan C., Froese, Duane G., Harington, C. Richard, Keddie, Grant, Kosintsev, Pavel, Kunz, Michael L., Martin, Larry D., Stephenson, Robert O., Storer, John, Tedford, Richard, Zimov, Sergei, Cooper, Alan

“…The widespread extinctions of large mammals at the end of the Pleistocene epoch have often been attributed to the depredations of humans; here we present…”
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Plant Macrofossils Associated with an Early Holocene Beaver Dam in Interior Alaska by Robinson, Simon, Beaudoin, Alwynne B., Froese, Duane G., Doubt, Jennifer, Clague, John J.

“…Dynamic climate changes and expansion of new biomes characterize the late Pleistocene-early Holocene of eastern Beringia. Analysis of plant macrofossils from…”
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Vegetation buried under Dawson tephra (25,300 super(1) super(4)C years BP) and locally diverse late Pleistocene paleoenvironments of Goldbottom Creek, Yukon, Canada by Zazula, G D, Froese, D G, Elias, SA, Kuzmina, S, La Farge, C, Reyes, A V, Sanborn, P T, Schweger, CE, Scott Smith, CA, Mathewes, R W

“…Paleoecological research at Goldbottom Creek in the Klondike region of Yukon Territory (NW Canada) documents an in situ riparian grassy meadow that was buried…”
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Palaeobotany Ice-age steppe vegetation in east Beringia by Zazula, Grant D, Froese, Duane G, Schweger, Charles E, Mathewes, Rolf W, Beaudoin, Alwynne B, Telka, Alice M, Harington, C. Richard, Westgate, John A

“…The landmass known as Beringia is an extensive region that existed during the Pleistocene epoch and included the land bridge between present-day Siberia and…”
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