the uppermost stage of the Jurassic system in the Mediterranean region.
The Tithonian stage was distinguished by the German geologist A. Oppel in 1856. It is divided into two substages and six zones, according to ammonite composition. It is represented mainly by limestones; in certain places it contains deposits of gypsums, rock salts, and potassium salts. In the USSR it is found in the Crimea, the Caucasus, and Kopetdag.
The Tithonian stage is stratigraphically equivalent to the Volga stage of the East European Platform (see alsoPORTLANDIAN STAGE).