The park provides shore access to a variety of geologic features and rock types. A very sharp contact between two rock types can be seen here. The light colored rock on the left is a type of granite called pegmatite. The darker colored rock is a metamorphic rock. Metamorphic rock has been changed by heat and pressure at depth in the earth, which produces a characteristic flattened structure called foliation. In this view, the foliation runs parallel to the shore.
The metamorphic rocks commonly show interesting surface patterns caused by differential weathering. Differential weathering reveals the internal structure of the rock by gradually wearing away the softer or less resistant areas.