In 1858, in a sand quarry in Haddonfield, New Jersey, William Parker Foulke discovered a near complete dinosaur skeleton - Hadrosaurus foulkii.   This was the first reasonably complete skeleton found in the world.   The real significance of it, however, was that for the first time scientists were able to study limb proportions, concluding that these animals walked upright in a bipedal mode - a revolutionary line of thought for reptiles.