The Globigerina Limestones of the Maltese Islands consist of a series of beds of varying character, the upper portions of which belong to the Lower Langhian, while the lower are referred to the Upper Aquitanian. The formation extends throughout both islands, but in the north-western and western portions it is masked by overlying beds of clays, greensands, and limestones, of Tortonian and of Helvetian age.