Pleistocene to Recent deposits of unconsolidated to semi- consolidated sands, clays, sandy clays, gravels, conglomerates, and a basal blue-grey glacial clay overlie Tertiary Skonun Formation.

Agate pebbles, from carnelian to an opaque and banded matrix variety of buff, brown and black shades, occur on the beach from Cape Ball to Fife Point. The agates occur in semi-consolidated conglomerates in bluffs at Cape Ball.