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Text Description: The composition reported here is the average of analyses of twenty samples: UA1124, UA1125, UA1129, UA1198, UA1299, UA1300, UA1303, UA1304, UA1313, UA1422, UA1423, UA1461, UA1463, UA1466, UA1471, UA1473, UA1475, UA1480, UA2083, and UA2163. Old Crow tephra can be traced across both Palisades East and West, and is generally present in most measured sections; 20 unique occurrences of OCt at Palisades identified. OCt is always located stratigraphically below (less than or equal to 6 m), or locally re-worked into, the MIS 5e peat/forest bed. Its tightly-constrained rhyolitic composition (Fig. 9A, B; Jensen and others, 2013), glass morphology, and stratigraphic context are well documented at the Palisades (see Beget and others, 1991; Matheus and others, 2003; Reyes and others, 2010a, 2010b, 2011) and elsewhere in eastern Beringia (e.g. Preece and others, 2011a). References: ![]() |
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 | |
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Jensen_Palisades_East | 65.1 | -153.19997 | Jensen, B. J. L. | The Palisades are on the south bank of the Yukon River in Nowitna National Wildlife Refuge, ~70 km downstream of Tanana village. Palisades East forms a heavily gullied, cliff-like exposure that is generally ~40-45 m in height, but ranges from ~25 m high at Site E to ~55-60 m high at Site D. It is difficult to access safely, with many near-vertical exposures and overhanging blocks of frozen sediment that frequently break free into the Yukon River. Location imprecisely georeferenced from Figure 1 in Jensen et al. (2013). Multiple sections were mapped and sampled across Palisades East: Site B1, B2, IB4, F, D1, and D2. See Jensen et al. (2013). | The composition reported here is the average of analyses of twenty samples: UA1124, UA1125, UA1129, UA1198, UA1299, UA1300, UA1303, UA1304, UA1313, UA1422, UA1423, UA1461, UA1463, UA1466, UA1471, UA1473, UA1475, UA1480, UA2083, and UA2163. Old Crow tephra can be traced across both Palisades East and West, and is generally present in most measured sections; 20 unique occurrences of OCt at Palisades identified. OCt is always located stratigraphically below (less than or equal to 6 m), or locally re-worked into, the MIS 5e peat/forest bed. Its tightly-constrained rhyolitic composition (Fig. 9A, B; Jensen and others, 2013), glass morphology, and stratigraphic context are well documented at the Palisades (see Beget and others, 1991; Matheus and others, 2003; Reyes and others, 2010a, 2010b, 2011) and elsewhere in eastern Beringia (e.g. Preece and others, 2011a). | Jensen_Palisades_East_Old_Crow_tephra_average | Tephra Fall | Cumulate | Glass | 75.38 | 0.29 | 13.08 | 1.76 | 0.06 | 0.29 | 1.49 | 3.69 | 3.67 | 9361 | EMP | 1.76 | Cl=0.28; H2O=4.16 | EMP |
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