When a giant storm moves across a coastline, its waves create waves that can blow away a beach or rock structure.
The phenomenon is called a cape, and is one of many that scientists believe have been eroded by winds.
One study has suggested the phenomenon may have occurred because of a massive ocean wave that slammed into Cape Cod, Massachusetts, on March 12.
The Cape Cod News reported that a small piece of a rock structure on the shoreline was washed away by the waves.
The Rockport Times said that the object was about 50 yards long.
The weather bureau, which tracks the weather, said that Cape Cod was forecast to get a tropical storm warning Saturday night, the first time in three years that the storm was forecast.
The news came a day after a major storm system slammed into the island of Rhode Island, bringing tropical winds and storm surges.
The storm hit Cape Cod at around 8:20 a.m. local time (1:20 p.m., EDT) and left more than a foot of surf in the harbor.
The storm surge, about a foot higher than the storm itself, killed at least four people.