Lighthawk
Weekend warrior
I just ran across this link while researching the complex geology of the northern Sierra.
Each quad map has color coded geology, and some of the which can be downloaded.
The Death Valley map is very interesting. There's also a Tahoe map at 1:100,000 detail level.
While I'm at it, I highly recommend caltopo.com for quick online access to 7.5' topo maps, including the whole USA, I believe. With a yahoo or google account you can do markups of the map (fairly clunky interface), and export kml files for your devices.
Each quad map has color coded geology, and some of the which can be downloaded.
The Death Valley map is very interesting. There's also a Tahoe map at 1:100,000 detail level.
While I'm at it, I highly recommend caltopo.com for quick online access to 7.5' topo maps, including the whole USA, I believe. With a yahoo or google account you can do markups of the map (fairly clunky interface), and export kml files for your devices.