Pale-white tephra that is 1 cm thick and occurs beneath sample S8619D. A thick (not specified) loess unit overlies this tephra, whereas a 1-cm-thick peat underlies it. This peat was radiocarbon dated at 5650 +/-160 yBP.
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||Geologic 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|
|S8619||61.56||-149.18||Fontana, M. R.||< 5650 ± 160 14C; 8881; Radiocarbon dated peat (S8619EP) that occurs directly below this tephra, providing a maximum age limit for this tephra.||-1800--||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.||Pale-white tephra that is 1 cm thick and occurs beneath sample S8619D. A thick (not specified) loess unit overlies this tephra, whereas a 1-cm-thick peat underlies it. This peat was radiocarbon dated at 5650 +/-160 yBP.||S8619E||Tephra Fall||Cumulate||Glass||77.61||0.27||11.74||1.4||Reported analytical value of zero. Reported standard deviation value of zero. 0||1.32||4.44||2.99||8881||EMP||1.4||Cl=0.19||EMP|