The Wissahickon Schist Geology series layers imagery of the of the Wissahickon Schist formation, found in Philadelphia’s Fairmount Park, and geologic maps of the region. The Wissahickon Schist was first extensively studied by the first professional female geologist, Florence Bascom, and is a layered metamorphic rock that has been exposed in the Wissahickon Valley by erosion from the Schuylkill River. In my study of geology, I became fascinated with geologic maps, which represent the distribution of different types of rock in a region. I am fascinated with these maps–the shapes and diagonals in Southeast Pennsylvania geology complement the forms of the rocks themselves. I wanted to layer imagery of the rock formations with their human-made interpretations.