Examples from the Web for hammerstone
The rim of the bowl is flattened, and this flat surface resembles that of the part of a hammerstone used for pecking.
Direct Percussion—flaking flint by striking it directly with a hammerstone or other object.
Hammerstone (L)—a hard pebble showing battering from use as a hammer.
The hammerstone shown in Fig. 41 was found on the surface near the head of Priest Rapids.
This had probably been used as a hammerstone, since it exhibits well-defined percussion marks at each extremity.The Maya Indians of Southern Yucatan and Northern British Honduras|Thomas William Francis Gann