Geologist Jeri Jones takes us “Stomping Through Time: The Great Valley and South Mountain.” Plans call for a visit to Specialty Granules (the “grit” mill) in Blue Ridge Summit, a prehistoric quarry, and other local sites. More details TBA. Adults only, age 15 and up. Transportation by bus only, provided. Pre-registration required. Fee: $50. Renfrew Institute member discount: $5 per seat. Bring bag lunch. For more information, call 717-762-0373 or email to info@renfrewinstitute.org.