Description: From Beget and others (1994): "A lower tephra, found from 30 to 50 cm depth, appears to record another, slightly older eruption of Redoubt Volcano. The EMP data show that this tephra is virtually identical to the Redoubt ash which occurs immediately above it (and about 50 years after it) in the Skilak Lake core sequence. This previously unknown Redoubt Volcano tephra eruption is estimated from sedimentation rate data to have occurred about 400+/-50 years ago."
"Recent field studies at Redoubt Volcano have identified a number of prehistoric lahars and intercalated weak soils preserved in the Rust Slough near the Drift River which were deposited approximately 250 14C yr B.P., corresponding to a calibrated calendar age of ca. 350 years ago (Beget and Nye, 1994). The similarity in age between the pair of Redoubt tephras found in Skilak Lake and the Rust Slough lahars suggests that the newly discovered tephras in Skilak Lake and the prehistoric lahars in the Rust Slough are broadly coeval, and apparently record a series of eruptions of Redoubt Volcano which occurred sometime between 300 and 400 years ago."
*Note that the Rust Slough lahar has been given a separate prehistoric eruption entry in the database because the coeval relationship between the tephras and the Rust Slough lahar is suggested to be broadly coeval and the relationship between the tephras and the Rust Slough lahar is not well defined.