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

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unpublished data, and new mapping by the authors, represents the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.

本数字地图数据库整合了已发表与未发表的历史数据，辅以作者团队新增的测绘成果，完整呈现了银湖7.5分钟图幅（Silver Lake 7.5 minute quadrangle）范围内基岩与表层沉积物的整体分布特征。该数据库遵循美国地质调查局（U.S. Geological Survey）的地层命名规范，以大致地质年代与岩性为依据对地图单元进行圈定。源地图的比例尺将本数据库的空间分辨率（比例尺）限定为1:24000或更小比例尺。