The Story in Rocks

The Wissahickon’s dramatically beautiful rock formations-- huge banded gneiss formed deep underground, garnet-studded schist that grace the foundations of so many homes—tell a great story of continents crashing into each other, mountains rising and falling, and time slowly revealing the Earth’s secrets. Sarah West has been leading popular Wissahickon geology walks and talks for many years, and shares the stories found in these rocks. You’ll never walk Wissahickon trails in the same way again. Thursday Night L!VE May 6, 2021