Marine sediments of the Albian Stage in southern and western Turkmenistan are represented by a succession of alternating clays, siltstones and sandstones with horizons of calcareous nodules and rare beds of shell limestones. They contain numerous fossils, among which ammonites are the most important for determining the age of the sediments in question, making it possible to establish a detailed stratigraphic scheme for the Albian sediments of Turkmenistan. In second place in importance for determining the age of the host sediments are bivalves and, above all, inoceramids. Different species of this family in the sections of the Albian of Turkmenistan usually occupy a certain stratigraphic interval ranging from one or two zones to two or three substages.