Going back to the scene of the chicken and the rock, notice how the redwoods behind are fire scarred.
It is the redwoods alone that are fire damaged. All the rest of the forest including oaks, bay trees, madrone, everything is all untouched. I am unable to find any history of fire in the park so my guess is it is ancient history occurring before the area was settled.
A tree party!
A grouping like this is when the mother tree has long since died and new growth has sprung from the root system left behind. You can just barely make out what is left from the original tree inside the circle of its offspring.