Washington Department of Natural Resources Geologic Mapping

During the last ten years, the Washington Department of Natural Resources (DNR) has completed several studies to improve the geological mapping of the 14 USGS map quads that encompass the Spokane area. These studies include:

• Remapping the Quaternary geology of the Missoula Flood deposits;
• Refining areas of bedrock geologic mapping; and
• Reconciliation of bedrock and Quaternary geology in conjunction with the Natural Resources Conservation Service.