The cartridges? I guess there's about 4 possibilities.
(1) a cowboy trying to shoot lunch.
(2) one of Pancho Villa's gang shooting
(3) one of the calvary shooting
(4) an Indian that just happened to have a Winchester saddle gun shooting.
Or I guess that could be broken down even more. (One of the above shooting at another of the above.)
Another large chunk of flint I just left where it was.
Button cactus in this picture. They are hard to see!
Turns out that what I thought was a button is volcanic.