stratigraphic unit
volume of rock defined by its petrographic, lithologic or paleontologic features
Pembroke Limestone Group
stratigraphic unit
suite
in geology, lithodemic unit consisting of two or more lithodemes of a single class
Valentine Formation
geological formation in the United States
Bishop's Frome Limestone
stratigraphic unit
Algonkian (stratigraphic unit)
the youngest unit of the Canadian Precambrian