Northwestern Mexico. I found this between a bunch of scattered rounded rocks. Is it mineral pattern or biological?   http://imgur.com/Y8gUgAb http://imgur.com/13tHqnh http://imgur.com/c0TiaaB http://imgur.com/1lgRuwz http://imgur.com/MYswynK http://imgur.com/sXECyfZ http://imgur.com/5LlME1i http://imgur.com/LfqT50d http://imgur.com/nxJuT56 http://imgur.com/clCnKlH http://imgur.com/x2LSBAx http://imgur.com/GArJmvB htt