Uppermost Cenomanian ammonites from Eure, Haute-Normandie, northwest France

Abstract

Temporary exposures of chalks spanning the Cenomanian – Turonian boundary to the east of Brionne, Eure, Haute-Normandie, France, yielded well-preserved ammonite faunas. The Metoicoceras geslinianum Zone assemblage is: Pseudocalycoceras angolaense (SPATH, 1931), Sumitomoceras cautisalbae (WRIGHT & KENNEDY, 1981), Calycoceras (Calycoceras) sp. juv., Eucalycoceras pentagonum (JUKES-BROWNE, 1896), Euomphaloceras septemseriatum (CRAGIN, 1893), Metoicoceras geslinianum (D’ORBIGNY, 1850), Hamites cimarronensis (KAUFFMAN & POWELL, 1977), Allocrioceras annulatum (SHUMARD, 1860), and Sciponoceras gracile (SHUMARD, 1860). The succeeding Neocardioceras juddii Zone assemblage is: Thomelites serotinus WRIGHT & KENNEDY, 1981, Neocardioceras juddii juddii (BARROIS & GUERNE, 1878), Neocardioceras juddii barroisi WRIGHT & KENNEDY, 1981, and Thomasites gongilensis (WOODS, 1911). Imprecisely localised are Pachydesmoceras sp., and Nigericeras aff. scotti COBBAN, 1972. 

The majority of the species are new for northern France, and confirm the northwards extension of typically Tethyan taxa (Thomasites, Nigericeras) into the Boreal region during the uppermost Cenomanian, and previously recognized in southern England, as well as the occurrence of cosmopolitan acanthoceratids well-known at this level in the United States (Pseudocalycoceras, Sumitomoceras).