On Sunday, Feb. 28, from 1:30 p.m. to 3:30 p.m., the Lyme Land Trust will offer a geology walk in the Brockway-Hawthorne Preserve with former state geologist Ralph Lewis. Masks must be worn in the parking lot, but may be removed during the walk if social distancing is maintained. Reservations are required. Contact education@lymelandtrust.org to reserve a spot.