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SAMPLE INFO : UA1677
Sample ID:UA1677
Station ID:Column_Point
Latitude:57.9
Longitude:-136.29998
Datum:NAD83
Sample Type 1:Tephra Fall
 Text Description:
More shard-rich than UA1675 or UA1767, but also included an abundance of phenocryst-rich glass. Shard morphology was mostly pumice with thin walls, further hindering analysis.

References:
Extending the Applications of Tephrochronology in Northwestern North America

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
Column_Point57.9-136.29998Unknown, Unknown 13895 ± 160 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. More shard-rich than UA1675 or UA1767, but also included an abundance of phenocryst-rich glass. Shard morphology was mostly pumice with thin walls, further hindering analysis.UA1677Tephra FallCumulateGlass 64.19 0.98 16.56 5.63 0.11 1.44 4.43 5.18 1.4 11151EMP5.63Cl=0.08; H2O=1.73EMP

SAMPLE LOCATION

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