SS, I am glad you have the expertise about the genesis.
When I returned from Quebec, I learned that my friends, a couple, both of whom were geologists, died unexpectedly. The wife was the one who introduced me to the beauty of Georgian Bay. When I returned from Georgian Bay previously , I always shared my photos with her, and she gave me some basic tutoring.
I have been to many areas of Georgian Bay and have a lot of photos of the rock formations. One of my photos was on the cover of Georgian Bay Island National Park years ago.