Gettysburg's Dinosaur Bridge

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The prints on the bridge to Big Round Top are that of the Anchisauripus, a medium-sized carnivore that walked on two legs, and the Atreipus, a smaller herbivore.  To date, no fossilized skeletal remains of these dinosaurs have been found, only the prints.  It is conjectured that these animals probably lived during the late Triassic period, around 200 million years ago.

Adams County, Pennsylvania and northern York County, Pennsylvania form part of the Gettysburg Basin, a geologic area that houses remains of rare and ancient life from the Triassic Period.  A thin geographic line from southwestern Adams County – beginning just beyond Fairfield and Carroll Valley where the South Mountains rise – travels diagonally to the northeast – ending at the tip of York and Lancaster Counties. These areas contain Triassic beds that are not found in any other part of Pennsylvania.  Gettysburg is the center of these beds.