Raised shorelines reflect changes in the lake geometry since the glacial retreat. They are due to a combination of processes including the evolution of the lake basin during periods when different outlets of the Lake dominated, to isostatic rebound of the surface after glacial unloading, and to global climate change.
KLT
Like bathtub rings, Old shoreline traces are found mimicing the current shore of the big lake, especially obvious at places like Bete Grise, Big Traverse Bay and Little Traverse Bay.
