The USGS has things like this:
http://wrgis.wr.usgs.gov/docs/parks/noca/nocaft.html
and this:
http://wrgis.wr.usgs.gov/docs/parks/noca/nocageol1.html
dunno if that's a help. It would help to know what kind of geology you are interested in: petrology, stratigraphy/seds, structural geology, geochemistry, etc. for instance you can talk about the chemical composition of rocks on Rainier, or the flow structure in its debris.