RECAP: Fort Tryon Rocks Tour with Urban Park Rangers

On Saturday, January 31, more than 40 adventurous park lovers bundled up and braved the extreme cold for an unforgettable Fort Tryon Rocks Geology Tour with NYC’s Urban Park Rangers in Fort Tryon Park.

As we hiked through the park, Rangers guided us through tens of thousands, and even millions of years of Earth’s history. Participants learned about the geological timeline of the region, from powerful tectonic forces to the immense impact of glaciers that once covered Manhattan. We explored how these forces carved, scraped, and molded the land, leaving behind the dramatic terrain that defines Fort Tryon Park.

The tour highlighted the park’s remarkable bedrock, including Manhattan schist and Fordham marble. Manhattan schist appears in several forms throughout the park and tells a fascinating story of transformation: once mud on the sea floor, it was later recrystallized under intense heat and pressure.  Participants even had the chance to feel and hold different rocks and crystals, making Earth’s history tangible in their hands.

One of the most awe-inspiring stops was at one of the park’s massive rock outcroppings, home to New York City’s largest glacial pothole. This striking feature is a reminder of the park’s icy past—formed by swirling glacial meltwater thousands of years ago. Today, only half of the pothole remains; the other half was blasted away during the park’s early construction to make room for a pathway, a vivid example of how natural history and human history intersect.

Special thanks to NYC’s Urban Park Rangers for leading such an engaging and educational afternoon! Their expertise brought the ancient story of Fort Tryon Park to life and reminded us that even on the coldest days, the park offers endless opportunities for discovery, learning, and wonder.