LADINIAN STAGE

upper of two subdivisions in the Middle Triassic Series, representing all rocks deposited worldwide during the Ladinian Age (235 to 230 million years ago). No global stratotype section and point (GSSP) for the base of the stage has been approved by the International Commission on Stratigraphy. The stage's name is derived from the Ladin people, who inhabit the region of the Dolomites in northern Italy. The Duchenstein and Wengen beds comprise the Ladinian Stage in its type district. Five ammonite biozones, beginning with Eoprotrachyceras subasperum and ending with Frankites sutherlandi, are widely used to correlate this interval. The Ladinian Stage overlies the Anisian Stage and is itself overlain by the Carnian Stage in the Upper Triassic Series.