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Rocks Talk with Hallam Harper and Sarah West

June 7, 2023 @ 10:00 am - 12:00 pm

Jeffrey laughead_spring_1

Meet at Harper’s Pavilion (Northwestern Avenue entrance to the park)

“What did the shy pebble say to the rock? ‘I wish I was a little boulder!’” Please join us to learn about the rocks found in Wissahickon Park and how they formed. We will begin with a geology talk at Harper’s Pavilion (across from the Cedars House at the Northwestern Avenue entrance to the park) for approximately 45 minutes. We will have rock and mineral samples from throughout the park to give participants an opportunity to look at the rocks closely and observe the fascinating colors, textures, and other properties. The talk will be followed by an optional short hike along Forbidden Drive to Bells Mill Road to observe rock exposures and an old quarry. Forbidden Drive is unpaved but is relatively level with a slight incline/decline and is suitable for participants who find trail walks difficult. Parking is available along Northwestern Avenue. Please leave dogs home as space is somewhat limited inside the Pavilion (service animals are always welcome). Kids are welcome with adult supervision.

Distance: 1 mile

Level: Easy (flat walking)

Registration is required for all hikes so that participants can be informed of weather or other emergency cancellations. We ask all event attendees to bring a mask and mask up if a distance of six feet cannot be maintained during the activity. If you or anyone in your household are exhibiting COVID-19 systems, please stay home. More information is at

Unless otherwise specified, Trail Ambassador Walks may be on rocky, rugged trails that may be wet and slippery. Wear sturdy shoes or boots with socks. Walks are cancelled in heavy rain. Service animals are always welcome. For more information contact Claire Brennan at Visit for updates.

Register Below!


June 7, 2023
10:00 am - 12:00 pm
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Harper’s Pavilion
200 W Northwestern Ave
Philadelphia, 19118 United States
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