Ghosts in the Stones
At the same time, the Lake was giving up its stones. Millions and millions of Great Lakes rocks. Stones of all and textures, uniform in size and shape within their particular rock-neighborhood. Pieces of the region’s bedrock are plentiful; sedimentary rocks from the Ordovician, Silurian, and Devonian periods. Much of Wisconsin lay beneath the Laurentian ice sheet in the Wisconsin Glacial Episode, the most recent of the ice ages. The state is blanketed with glacial drift.
It’s Lake Michigan’s nature to turn stones into smooth ovals. But some of those rocks contain fossils. Or did contain fossils. Limestone, sandstone, quartz, and chert often contain irregularities, traces that can be identified as fossils. When I look at the weathered rocks, I see ghosts.
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