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.
Extending the Applications of Tephrochronology in Northwestern North America
|StationID||Latitude||Longitude||Geologist||DateVisited||Age Info||Volcano||Eruption||Location Description||Text Description||Sample ID||Sample Type 1||Sample Type 2||Final Unit||Material||Coeff||SiO2||TiO2||Al2O3||FeOT||MnO||MgO||CaO||Na2O||K2O||P2O5||Total-majors||REF majors||METH majors||Fe2O3/Fe203T orig||FeO/FeOT orig||Volatiles csv||METH volatiles||Cs||Rb||Ba||Sr||La||Ce||Pr||Nd||Sm||Eu||Gd||Tb||Dy||Ho||Er||Tm||Yb||Lu||Y||Zr||Nb||Hf||Ta||Pb||Th||U||Sc||V||Cr||Fe||Co||Ni||Cu||Zn||Ga||Mo||As||Na||K||Ref trace1||METH trace1||Rb||Ba||Sr||La||Ce||Nd||Sm||Eu||Gd||Dy||Er||Yb||Lu||Y||Zr||Nb||Pb||Th||U||Sc||Ti||V||Cr||Ni||Cu||Zn||Ga||Ref trace2||METH trace2||Light csv||Halogen csv||other major csv||other lile csv||other ree csv||other hfse csv||other hpe csv||other tm csv||other misc csv|
|Column_Point||57.9||-136.29998||Unknown, 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.||UA1677||Tephra Fall||Cumulate||Glass||64.19||0.98||16.56||5.63||0.11||1.44||4.43||5.18||1.4||11151||EMP||5.63||Cl=0.08; H2O=1.73||EMP|
This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137
Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.