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These dark stripes, the lateral moraines are rubble stripped from the mountains. The rubble is thick, on the surface several dump trucks of thickness, and they usually continue well below the surface. They stretch all the way down the glacier, 35 miles from this point. All of that rock has been removed from the mountains. It's a detailed logbook of erosion. It's all right there, neatly organized, easily measured, and it's a huge sum.