Petroglyphs at Sproat Lake

These petroglyphs reminded me immediately of the work of Norval Morrisseau; I'd be very surprised to learn he had never seen them. They are far more articulated than the petroglyphs on the Susquehanna in Lancaster County. Most of them seem so stylized as not to represent recognizably something "factual" but are probably mythical beings; but one in the lower left looks very much like an Orca to me. Frankly, we were hustled to and from the petroglyphs so fast it was hard to gain a real appreciation for them, and while we were there, as noted infra, some folks partying at the dock and jumping from the top of the rock face on which the petroglyphs were carved were in some respects the immediate interest.

One of the features of the petroglyphs I find notable is their location: why Sproat Lake? The setting is nice enough, but not breathtaking, and the rock face is one of several in the area. Was it chosen because of its relative obscurity? Was the rock itself of significance, or perhaps simply of a suitable hardness for the work of carving? Had some event occurred there that stimulated the image-making? Over how many years were the petroglyphs made -- were they by a single individual, or do they represent a tradition spanning centuries, even millenia? Was the water-level always as high as now, or were the carvings once much further from water-level?

My own guesses -- admittedly only guesses -- are that the carvings were probably made within a fairly narrow span of time, by a small group or even by an individual, that they represent a single vision or a closely-related group of experiences, and that they are connected in some way with the immediate spot, which, I would guess, when the rocks were carved, was well above the level of the lake. An exposition of my reasoning will have to be made in another context.