Robert Thorson, professor of geology at the University of Connecticut, will speak on Saturday, June 14 from 10 a.m. to noon at the Polly Hill Arboretum in West Tisbury on the cultural and environmental history of stone walls.

From rugged coastline, granite ledges, and lichen-covered glacial boulders to the signature stone walls that ribbon our forests and fields, the New England landscape is defined by stone. The Vineyard is no exception: the presence of stone walls in the landscape reflect the history of the Island and its people.

Following the talk, Mr. Thorson will lead the group on a tour to explore the stone walls on Arboretum grounds and the adjoining property of the Martha’s Vineyard Museum.

Admission is $24 for members of the public and $20 for arboretum and museum members. More information is available by calling 508-693-9426.