Maine Mineral And Gem Museum

Granite with Basalt Dike

Basaltic magma intruded into a fracture in the pink granite of the Webhannet Pluton. Thus, the basalt is younger than the granite. This is an example of a crosscutting relationship that geologists use to determine the sequence of geologic events.

Location: Bald Hill Quarry, Wells, York County

Gift of Millennium Granite Quarry and Stoneworks