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Join the National Park Service and geologist, educator, and author Dr. Bill Witherspoon for a program that really rocks! The program, led by Bill Witherspoon, author of Roadside Geology of Georgia, will consist of a geology walk in the park followed by a presentation in the historic Hewlett Lodge Visitor Center. Dr. Witherspoon will lead us on a short hike along the river at Island Ford to observe, identify, and learn about important geology – past and present - along this scenic section of the Chattahoochee River. Following the hike, we’ll learn more about these fabulous rocks, how they shaped the landscape and history here, and where else to find really neat geology nearby around Atlanta. Copies of Roadside Geology of Georgia will be available for purchase and signing. Don’t take this program for granite; register for a spot today! IMPORTANT NOTE: All trails at Island Ford are closed until later Spring 2026 as Chattahoochee National Park Conservancy transforms and rehabilitates the trails. This special program with park staff will allow us to stay safe and sustainable on trails that avoid interfering with current trail work. Visitors are not allowed on unit trails at this time unless they are part of a guided program with park staff. We will proceed rain or shine; in case of severe weather program may be contained to indoor portion. Location : Meet at Hewlett Lodge Visitor Center, Island Ford Unit, 1978 Island Ford Parkway, Sandy Springs, GA, 30350. Note you must enter Island Ford Parkway via the park entrance at 8800 Roberts Dr, not Northridge Rd (though some mapping applications may try to send you there.) Bring: clothing layers shoes suitable for walking on a non-paved forest trail water sunscreen enthusiasm No pets or animals other than trained service animals at this program.