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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). |