The national park where the struggling Continental Army endured a tough winter during the American Revolution boasts a new feature that's hundreds of millions of years old: dozens of fossilized dinosaur footprints.
In this Feb. 28, 2019 photo, a fossilized dinosaur footprints are shown on a paving stone at the Valley Forge National Historical Park in Valley Forge, Pa. A volunteer at the park outside Philadelphia recently discovered dozens of fossilized dinosaur footprints on flat rocks used to pave a section of hiking trail.
To the untrained eye, they appear as indistinguishable bumps in the sandstone rock, with the largest about 9 inches long. On a recent weekday, hikers, joggers and dog walkers used the trail, oblivious to the marks of prehistoric animals beneath their feet. Most of the tracks left in what were once muddy flats consist of three-toed foot impressions from the early days of dinosaurs, although Stack also found footprints from a non-dinosaur reptile, a relative of the modern crocodile. The largest would have been a bipedal theropod that was 6 to 9 feet long and 4 to 6 feet high.
The National Park Service requested the exact location of the rocks not be publicized, to help protect them from being damaged or removed. Officials said visitors will be told about the rocks and how park resources are protected, but not where to find them. The 5-square-mile park has about 30 miles of trail.
More than 270 National Park Service properties contain some sort of paleontological resource, from Dinosaur National Monument in Colorado and Utah to the fossils scattered in rock used to build the Lincoln Memorial and Capitol Reflecting Pool in Washington, D.C. There are at least 35 Park Service properties known to have fossil tracks of ancient vertebrates, and vandalism and theft have been a problem. Federal law prohibits visitors from disturbing park elements.
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