The central Maine coast consists of long rocky points and equally long narrow inlets - following a linear pattern related to a combination of glacial scouring and metamorphic fabric. Bailey Island is the tip of one of these long points, but is in itself formed of several rocky ridges. And these ridges have ridges - the rocks exposed at Land's End and the rocks exposed at Giant Staircase and the rocks at Cook's all have the same ne-sw grain as the larger landscape.
The beach out in front of the parking lot at Cook's hasn't changed much since I was a toddler (hshipman, for more personal history). The rocky ledges trap small slivers of gravely beach and accumulations of broken shell and, in this case, snail (periwinkle?) shells.
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