Rocks, Rock Oil and Peak Oil

ALMOST 2,000 YEARS AGO, a Stone Age tribe made camp under a sandstone overhang in a place south of Pittsburgh now called Meadowcroft Rock Shelter, in Washington County. Theirs was a world still in glacial throes, with the edge of a mile-thick sheet of ice not far to the north. On the edge of a frozen ice desert that covered half the continent, these ancients sought protection from the bitter elements. Today, visitors to Meadowcroft can enter an open excavation and view evidence of tools and campfires made by these wandering souls so long ago.

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