I read this old post just awhile ago, and realized those foothills are actually behind my backyard: http://www.thefossilforum.com/index.php?/topic/37632-jaw-bone-with-tooth-found-in-highland-ca/
I couldn't believe it, there actually might be fossils that are nearer to me!
One question though, what do fossilferous sites look like? (I'm looking on Google Maps.)
Any help will be appreciated.