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SAMPLE INFO : UT845
Sample ID:UT845
Station ID:Eva_I
Latitude:64.8
Longitude:-148
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
3.5-cm-thick, horizontal tephra with abundant mafic minerals that is interbedded with grey silt and oxidation streaks. Occurs in three layers with a maximum thickness of 6.5 cm. The basal 0.5 cm consists of sand-sized, crystal-rich tephra overlain by 2 cm of finer-grained, cross-bedded tephra with abundant mafic minerals. The upper 4 cm is the primary bed; it is cream-colored unit and overlain by 3 cm of cross-bedded crystal-rich sand.

References:
Tephrostratigraphy of the late Cenozoic Gold Hill loess, Fairbanks area, Alaska
Tephrochronology of late Cenozoic loess at Fairbanks, central Alaska
Changing ideas on the identity and stratigraphic significance of the Sheep Creek tephra beds in Alaska and the Yukon Territory, northwestern North America

GEOCHEM DATA
StationIDLatitudeLongitudeGeologistDateVisitedAge InfoVolcanoEruptionLocation DescriptionText DescriptionSample IDSample Type 1Sample Type 2Geologic 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
Eva_I64.8-148Preece, S. J.< 190000 ± 20000 stratigraphy; 4365; This is the maximum age of all Sheep Creek tephra from Westgate and others (2007), who demonstrated that the Sheep Creek tephra is actually made up of several stratigraphic units.Road cut on the west wall of the Eva mining cut, Ester, Alaska, about 200 m south of station Eva II. Location imprecisely georeferenced from Figure 4 in Preece et al. (1999). 3.5-cm-thick, horizontal tephra with abundant mafic minerals that is interbedded with grey silt and oxidation streaks. Occurs in three layers with a maximum thickness of 6.5 cm. The basal 0.5 cm consists of sand-sized, crystal-rich tephra overlain by 2 cm of finer-grained, cross-bedded tephra with abundant mafic minerals. The upper 4 cm is the primary bed; it is cream-colored unit and overlain by 3 cm of cross-bedded crystal-rich sand.UT845Tephra FallCumulateGlass 73.24 0.26 16.19 1.69 0.22Reported analytical value of zero. Reported standard deviation value of zero. 0 2.44 4.21 2 93.7856EMP1.69Cl=0.1EMP 0.7 43 608 760 10.12 17.2 6.4 1.28 0.44 0.13 0.62 0.11 2.13 0.27 2.37 0.86 3.43 4.53 49 56INAA

SAMPLE LOCATION

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