Scull rock ... or not

In Joshua Tree park me and Eva were looking for Scull rock. It was getting dark and although the rock was supposed to be just some half kilometer from our camping site, we could not find it. It was a bit scary in the darkness, since snakes, rabbits, mice, and lizards were all over. Anyway, this picture shows what we found and as it turns out, real scull rock looks like this. To me, they are both far from looking like a scull.