Database of geological group or formation exposures?
You may also find localised geological guides, such as the Roadside Geology series.

http://geology.com/store/roadside-geology.shtml has a listing. While I have not used them, I have seen them crop up fairly often as a nice option when looking for interesting geology in more general terms, including for some outcrops.

(I would have made this a comment, rather than an answer, but have no rep yet.)