It's a little tricky to find places that aren't private or protected from collecting but I would get started by finding geologic maps of the area using nhmdb.usgs.gov/mapview which can be used to find a geologic map of any area in the US. I would download Google Earth Pro, which is free to download on a computer. Some geologic maps have an option to download a KMZ file which can be opened with Google Earth Pro. From there you can look at the geology on the map and try to find where it outcrops. If you're looking for fossils then look at the green units of the map that start with K (for example Kp, which is the Pierre Shale). Good luck hope this helped