A flow some 200 feet (60 meters) thick, eroded over the past billion years, formed both Palisade Head and Shovel Point, which is within the main part of Tettegouche State Park about two miles (three kilometers) to the east.
A flow some 200 feet (60 meters) thick formed extremely hard volanic rock which resisted a billion years of erosion which cut down surrounding formations. This flow formed both Palisade Head and Shovel Point, which is within the main part of Tettegouche State Park about two miles (three kilometers) to the east.