Sample collected 17 m below the top of a 25 m section of organic silts. The tephra immediately overlies peat beds that contain pine, spruce, and birch pollen.
Fission-track ages of late Cenozoic distal tephra beds in the Yukon Territory and Alaska
A contribution to the Pleistocene geochronology of Alaska and the Yukon Territory: fission-track age of distal tephra units
Stratigraphy, fossils, and age of sediments at the upper pit of the Lost Chicken gold mine: new information on the late Pliocene environment of east central 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|
|Lost_Chicken||64.05||-141.8833333||Unknown, Unknown||< 2600000 ± 900000 phenocryst - FT; 1182; Zircon microphenocrysts and glass shards were dated by fission tracks. Zircon crystals contained abundant defects and the glass date of 1.72+/-0.31 Ma is much younger than the zircon. This is the maximum age estimage, obtained from zircon fission tracks.||Lost Chicken Mine, at mile 69 of the Taylor Highway, east-central Alaska. Tephra samples collected from gold mine section above the road, on high terrace of Fortymile River, not from mining exposures below the road in the valley. Coordinates provided as degrees/minutes and converted to decimal degrees. Datum not specified, assumed to be NAD83.||Sample collected 17 m below the top of a 25 m section of organic silts. The tephra immediately overlies peat beds that contain pine, spruce, and birch pollen.||UA771||Tephra Fall||Cumulate||Glass||77.09||0.07||13.57||0.8||0.06||0.13||0.75||4.43||3.1||11281||EMP||0.8||H2O=7.31||EMP|
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