While volunteering up at the Grand Traverse Lighthouse, I took some time to walk the shoreline. The director of the lighthouse pointed out an unusual stone in the shallow water near the lighthouse. This tan colored stone (first photo) had been worked at one end to form a groove. The story behind a rock like this was that the Native Americans would groove rocks along the shoreline where they wanted to tie up their canoes. This rock would probably been stood on end so that the groove would be on top, ready for a rope to be looped around it.
I hiked the 5 miles from the lighthouse to the other end of Cat Head Bay, and on that point found this second rock. It also looks like it has had grooves worked into it, and it was near the point which would have been a land feature easily recognized from the lake.
This second rock was quite large. My boot is in the shot to give a sense of its scale.
On the hike back from the point, I was treated to this fireball sunset.