One story says that the pictographs depict a great serpent that lived in the lake. Waves appear to be going across the top of the panel. The center symbol is thought to be a river or waters coming together between two rocks and down at the bottom is a fish or serpent entering.
Another story says the panel shows a great flood that filled the lake. Waters are shown coming together.
Mysteries remain: Is that a comet up on top of the boulder? With a sheep or deer? And what is the symbol that looks like two joined circles?
The pictographs remain enigmatic.