Small granite cobble with a groove pecked into the middle, dividing the stone into one conical end and one rounded end with pecking.
The Wampanoag moved seasonally to make use of resources; they lived closer to the water during warmer months and moved inland to hunt during colder months. When they moved, they left the wooden frames of their dwellings behind, sometimes along with caches of tools for when they returned the following season. Although this hammer head is small, large hammer stones and other heavy tools could be left at a site seasonally to be used when its inhabitants returned the following year. Grooved hammers like this one were used from 6,000 to 400 years ago. Many other hammerstones were found at Eel River, and are identified by battering marks on the ends from use.