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Abstract
Our detailed mapping in the south Puget Sound basin has identified two tephras that are tentatively correlated to tephras from Mount St. Helens and Mount Rainier dated ca. 100-200 ka and 200 ka, respectively. This, plus the observation that fluvial and lacustrine sediments immediately underlying the Vashon Drift of latest Wisconsin age are nearly everywhere radiocarbon infinite, suggests that glacial and nonglacial sediments of more than the past five oxygen-isotope stages are exposed above sea level. Distal lacustrine advance outwash equivalent to the Lawton Clay in the Seattle area is conspicuously absent. Instead, a thick (>120 ft) glaciolacustrine silt below the Vashon sediments contains dropstones and is radiocarbon infinite. Elsewhere, coarsegrained advance Vashon outwash rests unconformably on radiocarbon-infinite non-glacial sediments. These relationships may imply that late Pleistocene tectonic activity has modified the paleotopography and stratigraphy of the south Puget Sound area.
Study Area
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Pleistocene tephrostratigraphy and paleogeography of southern Puget Sound near Olympia, Washington |
| Series title | Special Papers of the Geological Society of America |
| DOI | 10.1130/0-8137-0004-3.225 |
| Volume | 4 |
| Year Published | 2003 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 12 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Monograph |
| Larger Work Title | Western Cordillera and adjacent areas |
| First page | 225 |
| Last page | 236 |
| Country | United States |
| State | Washington |
| City | Olympia |
| Other Geospatial | Puget Sound |
| Google Analytic Metrics | Metrics page |