An Entrance to Former Worlds: the Cave, Landscape, and Geologic History of Valley Forge

Park Event · Valley Forge National Historical Park · Oct 17, 2026 · 1:00 PM–2:00 PM

An Entrance to Former Worlds

1 pm in the Meeting Room at Valley Forge

John A. Sime, PhD Lecturer, University of Pennsylvania

This is a story about how five-hundred-million-year-old rocks, which formed beneath ancient seas, came to entomb five-hundred-thousand-year-old fossils, that recorded the demise of extinct land mammals.

National Fossil Day

In honor of the 17th anniversary of National Fossil Day, Valley Forge National Historical Park is celebrating the amazing Ice Age fossils of Valley Forge with a day of interactive, family-friendly activites and special programs.

Source: National Park Service (public domain).