Mano (Handstone)

A mano is a handheld grinding stone used in conjunction with a larger grinding surface such as a metate or slab. Manos were used to grind seeds, grains, nuts, and pigments by applying downward pressure and back-and-forth or circular motion. They are typically shaped through use rather than formal manufacturing, resulting in faceted grinding surfaces. Some manos are one-handed, while larger varieties are two-handed for more intensive grinding. Materials include sandstone, basalt, granite, quartzite, and other stones capable of forming a smooth grinding surface.

Manos commonly range from 8 to 20 cm (3 to 8 inches) in length. Width usually ranges from 5 to 10 cm (2 to 4 inches). Thickness often falls between 3 and 8 cm (1.25 to 3 inches). Shapes vary widely: ovate, rectangular, cylindrical, or flattened. Many manos have one grinding face, while others (bifacial manos) have two parallel worn surfaces. Use-worn facets are typically smooth, flattened, and slightly concave or convex depending on the grinding technique. Edges may be rounded from repeated handling. Larger two-handed manos are longer and thicker, allowing for increased grinding efficiency.

Manos are found across nearly every region of North America. They are especially abundant in the Southwest, Great Basin, California, Plains, and Eastern Woodlands. Their distribution reflects areas where grinding seeds, nuts, maize, roots, and pigments was a major part of subsistence. Manos are commonly recovered at long-term campsites, agricultural villages, pithouse sites, storage areas, rock shelters, and quarries where plant processing occurred. In the Southwest, manos are strongly associated with Ancestral Puebloan, Hohokam, and Mogollon agricultural communities.

Manos were a core component of daily food preparation. In agricultural societies, manos ground maize into meal or flour. In foraging groups, they processed seeds, nuts, roots, and berries. Many manos display heavy wear from years of use. Archaeologists often categorize manos by type: one-handed, two-handed, unifacial, bifacial, or “cobble manos.” Manos are frequently found in association with metates, slab metates, trough metates, or basin metates. The presence of manos often indicates sedentism, food storage, and reliance on processed plant foods. Some manos were recycled into hammerstones or pitted stones once worn down.