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Text Description: The composition reported here is the average of analyses of two samples: UA1467 and UA1468. Present at two of the three gullies that comprise Site D2, including one gully where it is ~10 cm below P10. The tephra is present as pink-orange semi-continuous pods ~0.5-3 cm thick that are within, or up to 40 cm below, the base of the Matheus and others (2003) middle peat (Fig. 2; Jensen and others, 2013). Glass morphology is distinct; the dominantly thick-walled pumice contains such abundant microlites that vesicles are deformed, and pure glass analyses are difficult. Some brown glass is present, and mineralogy consists of plagioclase, which is frequently zoned, and pyroxene. References:  The Palisades is a key reference site for the middle Pleistocene of eastern Beringia: new evidence from paleomagnetics and regional tephrostratigraphy |
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