Abstract
Thermoluminescence (TL) and infra-red stimulated luminescence (IRSL) ages have been determined for loess from the Columbia Plateau region of southeast Washington and northeast Oregon, U.S.A. The IRSL ED values and ages appear to be tending towards a maximum level lower than that of the TL ED values and ages. In general, the TL ages are in stratigraphic order and agree well with the age control, in the form of 14C and TL dated tephra units derived from various eruptions of Mount St Helens.
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