Pale-white tephra couplet that is 2 cm thick and occurs approximately 100 cm below surface. The couplet occurs within loess and peat, with each tephra being uniformly approximately 0.5 cm thick and separated by loess.
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|
|S8619||61.56||-149.18||Fontana, M. R.||< 5650 ± 160 14C; 8881; Radiocarbon dated peat (S8619EP) that occurs 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 couplet that is 2 cm thick and occurs approximately 100 cm below surface. The couplet occurs within loess and peat, with each tephra being uniformly approximately 0.5 cm thick and separated by loess.||S8619D||Tephra Fall||Cumulate||Glass||76.39||0.23||12.46||1.5||Reported analytical value of zero. Reported standard deviation value of zero. 0||1.91||4.44||2.65||8881||EMP||1.5||Cl=0.42||EMP|