PAL tephra is generally found below a peat; however, organic-rich silt and peat deposits also occurred below it at several sites. Primary beds of PAL tephra are 2-5 cm thick, however, reworked PAL tephra can be up to 10-20 cm thick. Diverse glass morphology, including tricuspate and bubble-walled shards, and blocky to frothy pumice.
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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