When I first saw the rock pile, through a couple hundred yards of sparse mountain hardwood, it looked as though the boulder had been stacked atop a section of bedrock. I wondered how it got there.
[pullquote]Mud that had become home to swamp plants was compressed into anthracite coal, to be mined several million years later by Irish laborers.[/pullquote]I knew it was not from glacial action. Between 2.5 million years and about 12,000 years ago, glaciers made multiple forays over North America. Some scientist believe that, left to its own devices, another Ice Age could occur, though we humans seem to be doing an excellent job of keeping the heat turned up.