Beyond its color and texture, a soil layer often contains other materials mixed into it, and the inclusions field captures them — things like pebbles, charcoal flecks, shell, brick fragments, or rootlets. These observations help characterize how a layer formed and whether it was disturbed. The field is free text and optional, so you record what is actually present in whatever detail is useful. Inclusions are distinct from culturalMaterials, which specifically notes the cultural content of the layer rather than its general matrix composition.
Technical section
Data model, API, and internals — visible to developers.