Three dinosaur footprints sit atop the rock bridge which carries South Confederate Avenue over Plum Run. The bridge, at the foot of Big Round Top, was constructed circa 1938. The rocks used to build the bridge are made of sandstone or siltstone. They were taken from the now abandoned Trostle Quarry, located approximately three miles east of York Springs, Adams County, Pennsylvania. The prints are from the Triassic period, of the Mesozoic era, approximately 200 to 250 million years ago. The Mesozoic era is also known as the “Age of Reptiles.”
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