The books are good, but if you pass any rock shops, stop in and ask
as they often have maps for local areas. Also if you purchase some
small item and then ask for more info some of the owners are quite
gracious at giving out one or two other areas they know of. Montana
has petrified wood, agate galore, sapphires, jasper, opal,
Thundereggs, and much more.
Also take a few minutes (or hours :)) to check out this site as they
have some great on rocks and Rockhounding.
After Googling Rockhounding in Montana, I found this site that looks
In Wyoming if you get anywhere near Kemmerer, check out the Wishee
Washee Rock Shop as this man knows where to dig Blue Forrest
Petrified wood. This is a beautiful brown wood with grain surrounded
by blue agate and sometimes, yellow calcite. Exquisite! Near there
are also fossil fish.
Karen Bahr - Karen's Artworx
Calgary, Alberta, Canada