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Sample ID:S8619B
Station ID:S8619
Sample Type 1:Tephra Fall
Text Description:
Reddish-brown tephra that occurs ~55 cm below surface. Tephra thickness varies from 2 to 4 cm thick; occurs within loess.

Holocene tephrochronology of the Matanuska Valley, Alaska

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
S861961.56-149.18Fontana, M. R.< 5650 ± 160 14C; 8881; Radiocarbon dated peat (S8619EP) that occurs below this tephra, providing a maximum age limit for this tephra. Large construction excavation on the Palmer-Wasilla Road, approximately 0.15 km west of the interserction with Hemmer Road in Palmer, Alaska. Exposure that is approximately 1.5 m tall and consists of Holocene-age loess mantling ice-contact stratified drift. The exposure extends laterally for over 50 m, with loess thickness remaining constant. Six tephra recorded in the stratigraphy, one of which was a couplet, and all of which were sampled. See Fontana (1988) for detailed stratigraphy. Coordinates provided as degrees/minutes and converted to decimal degrees; datum not provided, assumed to be NAD83. Reddish-brown tephra that occurs ~55 cm below surface. Tephra thickness varies from 2 to 4 cm thick; occurs within loess. S8619BTephra FallCumulateGlass 74.55 0.14 14.63 1.93 Reported standard deviation of zero. 0.57 2.34 5.07 2.34 8881EMP1.93Cl=0.35EMP


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