Remember the fall?

With the snow now thick outside my window, I am browsing old picture files looking to see what space I can free up on my hard drive. These two large rock-on-rock examples from Bolton, along the edge of a wetland/brook:
remind me of some other large rock-on-rocks that I saw last weekend along a brook on Mt Pisgah, Berlin:I wonder if there is significance to the large size of the upper rocks?