Geology

Source Shapefile Google Earth Metadata Author Snapshot Scale
Caldera Boundaries Shapefile Google Earth N/A Christiansen, Ramsey Koch (2010) Snapshot  
Geothermal Areas Shapefile Google Earth Metadata NPS Snapshot  
Christiansen Summary Maps
(most recent)
Shapefile Google Earth Metadata Christiansen, Ramsey Koch Snapshot  
USGS Bedrock Geology Quad Maps Shapefile Google Earth Metadata Various, complied by NPS Snapshot 1:62,500
USGS Surface Geology Quad Maps Shapefile Google Earth Metadata Various, complied by NPS Snapshot 1:62,500