Jeb, I have a page bookmarked that lists all the flint types by state. This is what it has on Wyoming. Unfortunately they don't list what parts of the state they occur in, but there is a lot of good rock up there.
Wyoming: Absaroka Chert, Dendritic Chert, Hartville Chert, Madison Banded Chert, Miongin Coble Chert, Opalized Wood, Spanish Diggings Quartzite, Spanish Diggings Agate, Spanish Diggings Red Breccia, Spanish Diggings Chert, Spanish Diggings Dendritic Jasper, Spanish Point Dendritic Agate, Tiff, Tiger Chert, Tosi Chert, Wapsipsicon Chert, Wyoming Oil Chert.