![]() The sedimentary characteristics of the lahar deposits indicate that they are related to volcanic eruptions of Mount Moffett and are evidence for Holocene volcanic activity at this volcano. An extensive sequence of volcanic debris-flow deposits (lahars) was identified on the eastern slope of Mount Moffett. These deposits are the primary water-bearing units on the island and their distri- bution is shown on the accompanying surficial geologic map. Surficial deposits on northern Adak Island, Alaska include a variety of volcanic, glacial, eolian, and beach sediments.
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