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By referring to what was said of the Iguanodon of the Wealden, the reader will perceive that the Dinosaur was somewhat intermediate between reptiles and birds, and left a series of tridactylous impressions on the sand. To determine the exact age of the red sandstone and shale containing these ancient footprints, in the United States, is not possible at present.
The tracks have been found in more than twenty places, scattered through an extent of nearly 80 miles from north to south, and they are repeated through a succession of beds attaining at some points a thickness of more than 1000 feet. The bipedal impressions are, for the most part, trifid, and show the same number of joints as exist in the feet of living tridactylous birds.
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