Xeno and the Freaky Skull of Cascade Falls

Today I was hiking near the town of Tiberon and I found a waterfall. Sitting on a rock, I noticed an indentation in the wall. Thinking it was a great place for a geocache, I climbed up to it. Deep inside a hole I found something so shocking that I nearly lost my grip and fell off the wall. It was dark, but I got a picture ... after checking under and behind the skull for hidden treasure or messages.