There are several places around my little part of the world that have remnants of these old rock fences. No one knows for sure who built them. The original settlers claimed they didn't. Some of our local historians claim they where built by the Spanish and used as a way station when transporting gold, silver, and copper back to Mexico. Others claim the comancheros out of New Mexico built them to keep their horses and sheep when trading with the indians. Either way, they are pretty interesting, and lots of old stuff has been found around them.