Geologic map of the Silver Lake quadrangle, Cowlitz County, Washington

This database and accompanying plot files depict the distribution of geologic
materials and structures at a regional (1:24,000) scale. The report is
intended to provide geologic information for the regional study of materials
properties, earthquake shaking, landslide potential, mineral hazards, seismic
velocity, and earthquake faults. In addition, the report contains new
information and interpretations about the regional geologic history and
framework. However, the regional scale of this report does not provide
sufficient detail for site development purposes. In addition, this map does
not take the place of fault-rupture hazard zones designated by the Oregon State
Geologist. Similarly, the database cannot be used to identify or delineate
landslides in the region.

This digital map database, compiled from previously published and unpublished
data, and new mapping by the authors, represents the general distribution of
bedrock and surficial deposits of the Silver lake 7.5 minute quadrangle. The
database delineates map units that are identified by general age and lithology
following the stratigraphic nomenclature of the U.S. Geological Survey. The
scale of the source maps limits the spatial resolution (scale) of the database
to 1:24,000 or smaller.