Terry McHugh sent me this picture of a glacier erratic that is nearly free of the drift it was embedded within at the south end of Marrowstone Island. This drift was from the last glacial period approximately 18,000 years old. Almost the entirety of Marrowstone is capped by very compact glacial drift. Terry and I have worked on a number of projects in Jefferson County over the past decade plus and I always appreciate ability to understand a landscape before I even show up.
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