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U.S. Geological Survey
Scientific Investigations Map 2903

Geologic Map of Northwestern Seattle (Part of the Seattle North 7.5’ X 15’ Quadrangle), King County, Washington

By Derek B. Booth, Kathy Goetz Troost, and Scott A. Shimel


thumbnail image of map

This map is the first of four new geologic maps covering the city of Seattle that are based on field exposures and an extensive database of subsurface geologic explorations. The landforms and near-surface deposits here record a relatively brief, recent period in the geologic history of the region that was dominated by the last advance of the continental ice sheet that covered the region about 17,000 years ago. Beneath the deposits of this ice sheet is a complex succession of older sediments that extends far below sea level across most of the map area. These older sediments are now exposed where modern erosion and landslides have sliced through the edge of the upland, most notably in coastal bluffs along Puget Sound.



File Name
File Type and Description
File Size
PDF file of 36" x 50" map sheet that can be used for viewing map in a browser, as well as for plotting (geologic map, description of map units, and correlation of map units)
31.1 MB
PDF readme file that explains the contents of the two data files
232 KB
88 KB
Zipped file that contains geodatabase data objects
131.8-MB file that opens into a 298.9-MB folder
Zipped file that contains the shapefile package
57.2-MB file that opens into an 80-MB folder

See also The Geologic Map of Seattle—A Progress Report (USGS Open-File Report 2005-1252). This map shows more area with less detail

For questions about the content of this report, contact Derek Booth

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This report is available via print on demand.

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URL of this page:
Maintained by: Michael Diggles
Date created: December 9, 2005
Date last modified: March 29, 2007 (mfd)