rock-stratigraphic unit

rock-stratigraphic unit

[′räk ¦strad·ə¦graf·ik ′yü·nət] (geology) A lithologically homogeneous body of strata characterized by certain observable physical features, or by the dominance of a certain rock type or combination of rock types; rock-stratigraphic units include groups, formations, members, and beds. Also known as geolith; lithologic unit; lithostratic unit; lithostratigraphic unit; rock unit.