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| This paper examines the geology of the Duwamish, Puyallup, and Nisqually River deltas (see map below). The rivers originate on or near the slopes of Mount Rainier, a large and active stratovolcano of the Cascade Range, and flow into southern Puget Sound. Sediment derived from extensive drainages in this volcanic terrain have formed thick deltaic deposits and record a complex sequence of valley fill. This poster reviews previous work and presents new data to determine how lahars, earthquakes, and landslides have affected the evolution of Holocene deltas in the region. |
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