Cenomanian ammonites of the Shuayb Formation, Jordan

Four species of ammonites belonging to the Family Acanthoceratidae (HYATT 1900) are described herein from sediments of the Late Cenomanian of northwestern Jordan. Calycoceras (Proeucalycoceras) guerangeri (SPATH, 1926), Calycoceras (Proeucalycoceras) picteti WRIGHT and KENNEDY, 1990, Calycoceras (Newboldiceras) asiaticum asiaticum (JIMBO, 1894), and Pseudocalycoceras harpax (STOLICZKA, 1864), are reported from marly layers of the top of the Shuayb Formation outcropping in Ibin within the Ajlun District. This assemblage of ammonites allowed for the assignment of these Jordanian sediments to the basal Late Cenomanian Calycoceras (Proeucalycoceras) guerangeri Zone of the standard biozonal scheme for the Mediterranean Faunal Province. The descriptions of these specimens of ammonoid genera and their species for Jordan shed additional information on their paleobiogeographic distribution through the Late Cenomanian interval.