The dikes and sills of the Dry Valleys are the remnants of a kind of plumbing system through which magma worked its way to the surface in a series of eruptions about 180 million years ago. Volcanic plumbing systems are rarely exposed at the surface. The reason is simply that around active volcanoes, lava covers everything. Exposed to view in various parts of the Dry Valleys, however, is a vertical slice of the dikes and sills immediately beneath the lavas, which cuts across layers of rock two and a half miles thick. Hence along the valley walls, geologists can see much deeper into the volcanic plumbing than they can almost anywhere else.
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