Complex sentence: This limestone is of marine origin and is divided into three distinct litho-stratigraphic units based on the productus chronology: the Late Permian Chideru, which contains many ammonites, the Late-Middle Permain Virgal, and the Middle Permian Amb unit.
Split into simpler sentences: This limestone is of marine origin and is divided into three distinct litho-stratigraphic units based on the productus chronology. The Late Permian Chideru, which contains many ammonites, the Late-Middle Permain Virgal, and the Middle Permian Amb unit.