Sinemurian Stage

the second stage from the bottom of the Liassic, or Lower Jurassic, series. It was identified in 1849 by the French paleontologist A. d’Orbigny near Semur, in Côte-d’Or, France. The Sinemurian is represented there by black limestones containing remains of lamellibranchs (Cryphaea) and ammonites (Arientitinae, Arnioceratinae, Echioceratinae, and Oxynoceratidae). Sinemurian strata are found in many places in Western Europe.