Rocks are handy for a campfire. A common use for stones in a campfire is to create a protective ring around the flame. This ring serves two purposes: Creates a barrier between the fire and the rest of the forest, keeping the rest of the woods safe. Creates a wind barrier that can help light the fire, especially in wet and windy conditions
Whatever the reason, someone made a campfire at my fossil dig site, it's a small secluded beach along a river. A nice place to make a campfire. By the way, I noticed that a rock they used to make the protective ring around the flame, had very dist