Location: Holden Arboretum Geologists take a 4-dimensional view of the world that includes time. Pat Biliter, a geologist retired from the U.S. Army Corps of Engineers, 15-year Holden volunteer, an Ohio Certified Volunteer Naturalist and instructor, and vice president of the Burroughs Nature Club will lead us on a walking tour that will focus on wildflowers, trees, and other plants that have an ancient geologic history, or grow only on specific types of rocks. Directions: We will meet in front of the Visitor Center. From I-90. Take exit 193 and turn south on Route 306. Go just short of a mile and turn left at the traffic light to take Route 615. After 0.2 mile, at another traffic light, turn right onto Kirtland Chardon Road. Continue southeast for 3+ miles to Sperry Road, where you turn left onto Holden property. Continue north on Sperry Road for 1+ miles. Watch for the gate to the Visitor Center on the left. From U.S. 6. Turn northwest onto Kirtland Chardon Road. Continue for about 2 miles to Sperry Road. Turn right onto Holden property (passing the Sperry Road intersection that goes to the left -- ignore it). Continue north on Sperry Road for 1+ miles. Watch for the gate to the Visitor Center on the left. No registration is required for this program.Guests are always welcome!