OK, Automatic spell check did poor job, someone has thrown lava rocks into the trail. I kicked many off to the side but there are still a lot of them on the trail. My daughter hit one on her road bike and it blew out the side wall of the tire requiring us to put something between the tube and the tire just to pump it up enough to get home. That was a $45 tire that is ruined because someone tossed rocks into the trail intentionally. Those rocks didn't magically hop up and get into the trail on their own. Lava rocks are sharp too.