Nestled up in the mountains past Happy Jack and Clints Well, directly after mile marker 300. There is a turn off on the west side of the road that has a small place to park and hangout for a minute. The cache is just past the cattle grate and to the right, just a few minute walk. Dog friendly too. This is my first cache and it's on a road I drive by quite a bit as I have a cabin up in that area. I left all types of stuff in there. A puzzle, bracelets, pinball game, leaping frogs game, train whistle, spinner, pocket tool, a dog figurine and some other stuff i can't think of.
The name came from the movie 300, figured it was fitting since this is at mile marker 300 and there are tons of animal bones in the area.
Grats to GeoDudez for the FTF.