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Sample ID:UA1675
Station ID:Column_Point
Sample Type 1:Tephra Fall
Text Description:
Low shard abundance, and available shards were often very broken up and degraded.

Extending the Applications of Tephrochronology in Northwestern North America

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
Column_Point57.9-136.29998Unknown, Unknown 14200 ± 255 14C; 11151; Age is approximate. Depth sequenced age using a Bayesian statistical phase model built from six radiocarbon age determinations. Dunning (2011) provides age as a range, which the mid-point of the range and standard deviation were determined from for entry into the database.A 40-cm-long monolith collected from a nearly flat expanse of peat near the level of mean low water on an exposed beach facing the open Gulf of alaska at Column Point, Chichagof Island. The monolith, approximately 400X150X150 mm, is bounded at the top by a thick tephra bed and at the base by a thin gravel layer. Five macro tephra layers were identified by visual inspection of lighter-coloured beds and number UA1674-1678 from base to top. Coordinates not provided, generic location selected on Chichagof Island, Alaska. Low shard abundance, and available shards were often very broken up and degraded.UA1675Tephra FallCumulateGlass 75.57 0.15 13.64 1.62 0.04 0.12 1.17 4.35 3.25 11151EMP1.62Cl=0.08; H2O=3.01EMP


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