Port Kennedy Bone Cave, Limestone cave in Valley Forge National Historical Park, Pennsylvania, US.
Port Kennedy Bone Cave is a limestone cavern in Valley Forge that holds fossil remains from animals living roughly 750,000 years ago. The cave extends approximately 50 feet deep and was uncovered during limestone quarrying operations.
Workers uncovered this cave in 1871 while quarrying limestone in the area. Paleontologists conducted excavations throughout the 1890s to study the fossil remains deposited there.
The fossils recovered here reveal what animals roamed this region thousands of years ago and how the landscape has transformed over time. This site helps visitors understand how different the natural world once was in this area.
The cave now sits within a protected park area, making it accessible for visitors to explore. Wear comfortable footwear and check beforehand on current access rules for the site.
This single location preserved remains of roughly forty extinct animal species found nowhere else together. Among them were saber-toothed cats, mastodons, and a ground sloth species known only from this site.
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