Seastack: A stack or seastack is a geological landform consisting of a steep and often vertical column or columns of rock in the sea near a coast, formed by erosion. Stacks are formed over time by wind and water, processes of coastal geomorphology. They are formed when part of a headland is eroded by hydraulic action, which is the force of the sea or water crashing against the rock. The force of the water weakens cracks in the headland, causing them to later collapse, forming free-standing stacks and even a small island. Without the constant presence of water, stacks also form when a natural arch collapses under gravity, due to sub-aerial processes like wind erosion. Stacks can provide important nesting locations for seabirds, and many are popular for rock climbing.
Shark Fin Cove: A short distance (0.7 miles) south of Davenport Beach is a small pocket beach with spectacular seastacks. It can be called Shark Fin Cove or Shark Tooth Cove, although the former seems to be the most accepted name. Photographers often visit the cove to catch images of the rocks in varying light. Parking is in a long turnout along the highway. A short, steep trail leads to the beach.
Source: Wikipedia
Congratulations to iyazim on FTF!