Pale-white tephra that is 1 cm thick and occurs about 20 cm below the surface, underlying loess, organics, and present-day vegetation cover. This tephra is continuous across the exposure and maintains a uniform thickness and horizontal profile throughout.
Holocene tephrochronology of the Matanuska Valley, Alaska
|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|
|S8514||61.78||-148.38||Fontana, M. R.||< 3390 ± 180 14C; 8881; Radiocarbon date on peat (S8514BP) that is ~43 cm below surface and 22 cm below this tephra, providing a maximum limiting age.||-1800--||Small gravel pit on the north side of the Glenn Highway, Alasksa, approximately 6 km east of the Chickaloon River crossing. Half-meter thick exposure of loess interbedded with layers of tephra and peat that mantles crumbling black shale of the Matanuska Formation. Four tephra recorded in the stratigraphy of this location, two of which were sampled and analyzed. See Fontana (1988) for detailed stratigraphy. Coordinates provided as degrees/minutes and converted to decimal degrees; datum not provided, assumed to be NAD83.||Pale-white tephra that is 1 cm thick and occurs about 20 cm below the surface, underlying loess, organics, and present-day vegetation cover. This tephra is continuous across the exposure and maintains a uniform thickness and horizontal profile throughout.||S8514A||Tephra Fall||Cumulate||Glass||72.44||0.45||13.95||2.97||0.78||2.6||4.04||2.47||8881||EMP||2.97||Cl=0.28||EMP|