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SAMPLE INFO : UT1
Sample ID:UT1
Station ID:HH-62-228
Latitude:67.46
Longitude:-139.9
Datum:NAD83
Sample Type 1:Tephra Fall
Sample Type 2:Bulk
Text Description:
The tephra occurs in cryogenically deformed, late-Pleistocene fluvial deposits located below the glaciolacustrine silt and clay that form a conspicuous, dark, recessive unit close to the top of the bluff. Tephra has reworked thickness of 5 to 10 cm and occurs within fine-grained, peaty floodplain deposits. Tephra continuity is disrupted by large ice-wedge casts whose infilling commonly contains small pockets of the tephra (See Figs. 4B and 5 in Westgate and others, 1983). Channel gravel and sand underlie the tephra-bearing sediments and these in turn unconformably overlie fluvial and lacustrine sediments of probable middle or early Pleistocene age (Pearce and others, 1982).

References:
Old Crow tephra: a new late Pleistocene stratigraphic marker across North-central Alaska and western Yukon Territory
Fission-track ages of late Cenozoic distal tephra beds in the Yukon Territory and Alaska
Discovery of a large-magnitude, late Pleistocene volcanic eruption in Alaska
Correlation techniques in tephra studies
A contribution to the Pleistocene geochronology of Alaska and the Yukon Territory: fission-track age of distal tephra units
Quaternary geology and late-Quaternary environments of the Holitna Lowland and Chuilnuk-Kiokluk Mountains region, interior southwestern Alaska
A catalogue of late Cenozoic tephra beds in the Klondike Goldfields and adjacent areas, Yukon Territory
Old Crow tephra across eastern Beringia: a single cataclysmic eruption at the close of Marine Isotope Stage 6

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2Final UnitMaterialCoeffSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-majorsREF majorsMETH majorsFe2O3/Fe203T origFeO/FeOT origVolatiles csvMETH volatilesCsRbBaSrLaCePrNdSmEuGdTbDyHoErTmYbLuYZrNbHfTaPbThUScVCrFeCoNiCuZnGaMoAsNaKRef trace1METH trace1RbBaSrLaCeNdSmEuGdDyErYbLuYZrNbPbThUScTiVCrNiCuZnGaRef trace2METH trace2Light csvHalogen csvother major csvother lile csvother ree csvother hfse csvother hpe csvother tm csvother misc csv
HH-62-22867.46-139.9Westgate, J. A. 124000 ± 10000 known unit; 10271; Age is approximate. Revised glass fission-track age with re-calibration; four Old Crow Tephra sample glass fission-track ages (UT1434, UT613, UT501, UT613).Big Bluff section of the Old Crow Lowlands, located along the Porcupine River in the Yukon Territory. The bluff is 55 m high and made up mostly of fluvial and lacustrine sediments. Station ID is from Hughes (1972); radiocarbon dates and magnetic polarity sequence reported in Pearce et al. (1982). Preece et al. (2011) also refer to this site as Ch'ijee's Bluff, Bluefish Basin.The tephra occurs in cryogenically deformed, late-Pleistocene fluvial deposits located below the glaciolacustrine silt and clay that form a conspicuous, dark, recessive unit close to the top of the bluff. Tephra has reworked thickness of 5 to 10 cm and occurs within fine-grained, peaty floodplain deposits. Tephra continuity is disrupted by large ice-wedge casts whose infilling commonly contains small pockets of the tephra (See Figs. 4B and 5 in Westgate and others, 1983). Channel gravel and sand underlie the tephra-bearing sediments and these in turn unconformably overlie fluvial and lacustrine sediments of probable middle or early Pleistocene age (Pearce and others, 1982).UT1Tephra FallCumulateGlass 75.28 0.31 13.02 1.73 1.39 3.87 3.85 2740EMP1.73Cl=0.25; H2O=3.55EMP 3.8 91 1000 25.2 51 26 5.8 0.88 0.87 3.7 0.65 6.3 0.8 9.7 4 7.1 3.5 53 2740INAA
HH-62-22867.46-139.9Westgate, J. A. 124000 ± 10000 known unit; 10271; Age is approximate. Revised glass fission-track age with re-calibration; four Old Crow Tephra sample glass fission-track ages (UT1434, UT613, UT501, UT613).Big Bluff section of the Old Crow Lowlands, located along the Porcupine River in the Yukon Territory. The bluff is 55 m high and made up mostly of fluvial and lacustrine sediments. Station ID is from Hughes (1972); radiocarbon dates and magnetic polarity sequence reported in Pearce et al. (1982). Preece et al. (2011) also refer to this site as Ch'ijee's Bluff, Bluefish Basin.The tephra occurs in cryogenically deformed, late-Pleistocene fluvial deposits located below the glaciolacustrine silt and clay that form a conspicuous, dark, recessive unit close to the top of the bluff. Tephra has reworked thickness of 5 to 10 cm and occurs within fine-grained, peaty floodplain deposits. Tephra continuity is disrupted by large ice-wedge casts whose infilling commonly contains small pockets of the tephra (See Figs. 4B and 5 in Westgate and others, 1983). Channel gravel and sand underlie the tephra-bearing sediments and these in turn unconformably overlie fluvial and lacustrine sediments of probable middle or early Pleistocene age (Pearce and others, 1982).UT1Tephra FallCumulateGlass 75.37 0.33 13.03 1.71 0.05 0.29 1.5 3.68 3.75 10271EMP1.71Cl=0.3; H2O=4.6EMP 76 187 23.6 49 25 5.1 0.8 0.85 1.2 3.1 3.3 0.59 30.3 290 6.4 0.75 7 3 5.9 7 1237XRF: Rb, Sr, Y, Zr, Th, U; INAA: La, Ce, Nd, Sm, Eu, Tb, Ho, Er, Yb, Lu, Hf, Ta, Sc, Cr;
HH-62-22867.46-139.9Westgate, J. A. 124000 ± 10000 known unit; 10271; Age is approximate. Revised glass fission-track age with re-calibration; four Old Crow Tephra sample glass fission-track ages (UT1434, UT613, UT501, UT613).Big Bluff section of the Old Crow Lowlands, located along the Porcupine River in the Yukon Territory. The bluff is 55 m high and made up mostly of fluvial and lacustrine sediments. Station ID is from Hughes (1972); radiocarbon dates and magnetic polarity sequence reported in Pearce et al. (1982). Preece et al. (2011) also refer to this site as Ch'ijee's Bluff, Bluefish Basin.The tephra occurs in cryogenically deformed, late-Pleistocene fluvial deposits located below the glaciolacustrine silt and clay that form a conspicuous, dark, recessive unit close to the top of the bluff. Tephra has reworked thickness of 5 to 10 cm and occurs within fine-grained, peaty floodplain deposits. Tephra continuity is disrupted by large ice-wedge casts whose infilling commonly contains small pockets of the tephra (See Figs. 4B and 5 in Westgate and others, 1983). Channel gravel and sand underlie the tephra-bearing sediments and these in turn unconformably overlie fluvial and lacustrine sediments of probable middle or early Pleistocene age (Pearce and others, 1982).UT1Tephra FallCumulateGlass 75.37 0.33 13.09 1.71 0.23 1.53 3.72 3.72 6782EMP1.71Cl=0.29; H2O=5.48EMP 24.6 49 23 5.6 0.96 0.82 1.3 3.6 0.53 5.9 0.8 6.5 3.7 4.8 1183INAA
HH-62-22867.46-139.9Westgate, J. A. 124000 ± 10000 known unit; 10271; Age is approximate. Revised glass fission-track age with re-calibration; four Old Crow Tephra sample glass fission-track ages (UT1434, UT613, UT501, UT613).Big Bluff section of the Old Crow Lowlands, located along the Porcupine River in the Yukon Territory. The bluff is 55 m high and made up mostly of fluvial and lacustrine sediments. Station ID is from Hughes (1972); radiocarbon dates and magnetic polarity sequence reported in Pearce et al. (1982). Preece et al. (2011) also refer to this site as Ch'ijee's Bluff, Bluefish Basin.The tephra occurs in cryogenically deformed, late-Pleistocene fluvial deposits located below the glaciolacustrine silt and clay that form a conspicuous, dark, recessive unit close to the top of the bluff. Tephra has reworked thickness of 5 to 10 cm and occurs within fine-grained, peaty floodplain deposits. Tephra continuity is disrupted by large ice-wedge casts whose infilling commonly contains small pockets of the tephra (See Figs. 4B and 5 in Westgate and others, 1983). Channel gravel and sand underlie the tephra-bearing sediments and these in turn unconformably overlie fluvial and lacustrine sediments of probable middle or early Pleistocene age (Pearce and others, 1982).UT1Tephra FallCumulateGlass 74.92 0.3 13.34 1.65 1.47 3.69 3.66 1698EMP: SiO2, TiO2, Al2O3, FeOT, CaO, K2O; INAA: Na2O; 1.841.65Cl=0.26; H2O=5.03EMP 24.6 49 23 5.6 0.96 0.82 1.3 3.6 0.53 5.9 0.8 6.5 3.7 4.8 5 1126INAA
HH-62-22867.46-139.9Westgate, J. A. 124000 ± 10000 known unit; 10271; Age is approximate. Revised glass fission-track age with re-calibration; four Old Crow Tephra sample glass fission-track ages (UT1434, UT613, UT501, UT613).Big Bluff section of the Old Crow Lowlands, located along the Porcupine River in the Yukon Territory. The bluff is 55 m high and made up mostly of fluvial and lacustrine sediments. Station ID is from Hughes (1972); radiocarbon dates and magnetic polarity sequence reported in Pearce et al. (1982). Preece et al. (2011) also refer to this site as Ch'ijee's Bluff, Bluefish Basin.The tephra occurs in cryogenically deformed, late-Pleistocene fluvial deposits located below the glaciolacustrine silt and clay that form a conspicuous, dark, recessive unit close to the top of the bluff. Tephra has reworked thickness of 5 to 10 cm and occurs within fine-grained, peaty floodplain deposits. Tephra continuity is disrupted by large ice-wedge casts whose infilling commonly contains small pockets of the tephra (See Figs. 4B and 5 in Westgate and others, 1983). Channel gravel and sand underlie the tephra-bearing sediments and these in turn unconformably overlie fluvial and lacustrine sediments of probable middle or early Pleistocene age (Pearce and others, 1982).UT1Tephra FallCumulateGlass 74.92 0.3 13.34 1.65 0.28 1.47 3.69 3.66 1792EMP: SiO2, TiO2, Al2O3, FeOT, MgO, CaO, K2O; INAA: Na2O; 1.841.65Cl=0.26; H2O=5.03EMP 1000 25.6 51 23 5.76 0.95 0.9 3.8 0.62 6 0.9 9.6 4 6.3 1698INAA
HH-62-22867.46-139.9Westgate, J. A. 124000 ± 10000 known unit; 10271; Age is approximate. Revised glass fission-track age with re-calibration; four Old Crow Tephra sample glass fission-track ages (UT1434, UT613, UT501, UT613).Big Bluff section of the Old Crow Lowlands, located along the Porcupine River in the Yukon Territory. The bluff is 55 m high and made up mostly of fluvial and lacustrine sediments. Station ID is from Hughes (1972); radiocarbon dates and magnetic polarity sequence reported in Pearce et al. (1982). Preece et al. (2011) also refer to this site as Ch'ijee's Bluff, Bluefish Basin.The tephra occurs in cryogenically deformed, late-Pleistocene fluvial deposits located below the glaciolacustrine silt and clay that form a conspicuous, dark, recessive unit close to the top of the bluff. Tephra has reworked thickness of 5 to 10 cm and occurs within fine-grained, peaty floodplain deposits. Tephra continuity is disrupted by large ice-wedge casts whose infilling commonly contains small pockets of the tephra (See Figs. 4B and 5 in Westgate and others, 1983). Channel gravel and sand underlie the tephra-bearing sediments and these in turn unconformably overlie fluvial and lacustrine sediments of probable middle or early Pleistocene age (Pearce and others, 1982).UT1Tephra FallCumulateGlassUnclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 76.04Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.28Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 13.07 Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.04Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.3Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 1.52Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 3.54Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 3.62Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.13 1126EMP1.6 3.6 1000 25.6 50.5 23 5.76 0.95 0.9 3.8 0.62 6 0.9 9.6 4 6.3 1792INAA

StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2Final UnitMaterialSiO2TiO2Al2O3FeOTMnOMgOCaONa2OK2OP2O5Total-majorsREF majorsMETH majorsFe2O3/Fe203T origFeO/FeOT origVolatiles csvMETH volatilesCsRbBaSrLaCePrNdSmEuGdTbDyHoErTmYbLuYZrNbHfTaPbThUScVCrFeCoNiCuZnGaMoAsNaKRef trace1METH trace1RbBaSrLaCeNdSmEuGdDyErYbLuYZrNbPbThUScTiVCrNiCuZnGaRef trace2METH trace2Light csvHalogen csvother major csvother lile csvother ree csvother hfse csvother hpe csvother tm csvother misc csv
HH-62-22867.46-139.9Westgate, J. A. 124000 ± 10000 known unit; 10271; Age is approximate. Revised glass fission-track age with re-calibration; four Old Crow Tephra sample glass fission-track ages (UT1434, UT613, UT501, UT613).Big Bluff section of the Old Crow Lowlands, located along the Porcupine River in the Yukon Territory. The bluff is 55 m high and made up mostly of fluvial and lacustrine sediments. Station ID is from Hughes (1972); radiocarbon dates and magnetic polarity sequence reported in Pearce et al. (1982). Preece et al. (2011) also refer to this site as Ch'ijee's Bluff, Bluefish Basin.The tephra occurs in cryogenically deformed, late-Pleistocene fluvial deposits located below the glaciolacustrine silt and clay that form a conspicuous, dark, recessive unit close to the top of the bluff. Tephra has reworked thickness of 5 to 10 cm and occurs within fine-grained, peaty floodplain deposits. Tephra continuity is disrupted by large ice-wedge casts whose infilling commonly contains small pockets of the tephra (See Figs. 4B and 5 in Westgate and others, 1983). Channel gravel and sand underlie the tephra-bearing sediments and these in turn unconformably overlie fluvial and lacustrine sediments of probable middle or early Pleistocene age (Pearce and others, 1982).UT1Tephra FallCumulateWhole-rockUnclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 73.15Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.58Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 12.85 Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.05Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 1.09Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 2.86 Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 3.09Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported. 0.17 1126XRF3.36 116 145 30.9 270 8 5 1237XRFNa2O V=Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported.2.79, M=FPHOT, R=1126;
HH-62-22867.46-139.9Westgate, J. A. 124000 ± 10000 known unit; 10271; Age is approximate. Revised glass fission-track age with re-calibration; four Old Crow Tephra sample glass fission-track ages (UT1434, UT613, UT501, UT613).Big Bluff section of the Old Crow Lowlands, located along the Porcupine River in the Yukon Territory. The bluff is 55 m high and made up mostly of fluvial and lacustrine sediments. Station ID is from Hughes (1972); radiocarbon dates and magnetic polarity sequence reported in Pearce et al. (1982). Preece et al. (2011) also refer to this site as Ch'ijee's Bluff, Bluefish Basin.The tephra occurs in cryogenically deformed, late-Pleistocene fluvial deposits located below the glaciolacustrine silt and clay that form a conspicuous, dark, recessive unit close to the top of the bluff. Tephra has reworked thickness of 5 to 10 cm and occurs within fine-grained, peaty floodplain deposits. Tephra continuity is disrupted by large ice-wedge casts whose infilling commonly contains small pockets of the tephra (See Figs. 4B and 5 in Westgate and others, 1983). Channel gravel and sand underlie the tephra-bearing sediments and these in turn unconformably overlie fluvial and lacustrine sediments of probable middle or early Pleistocene age (Pearce and others, 1982).UT1Tephra FallCumulateWhole-rock 116 145 30.9 270 8.2 4.6 1126XRFNa2O V=Unclear if averages are reported or if data are individual points of analysis. Standard deviation not reported.2.79, M=FPHOT, R=1126;

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