Cowles Bog trail runs right along the foot of a dune, right at the transition from Oak savana to wetland. Cowles Bog isn't a bog at all, it's a fen, a wetland with a source of water that is not acidic, but rich in minerals.
One portion of dune progression is easily seen here where the trees turn from Oak and Maple to Birch on the edge of the wetland.
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