Twenty-two ammonite species are identified in the upper Albian Mortoniceras ( Subschloenbachia ) rostratum , perinflatum and Stoliczkaia Shumarinaia africana Zones, lower Cenomanian Mantelliceras mantelli Zone. The Placenticeras Saadensis Thomas (Thomas Peron, 1890, 1890 is revised, including Engonoceras Thomasi Pervinquière, 1907, placed within genus Hypengonoceras Spath, 1922. This accurate b...

Ammonites are among the best-known fossils of the Phanerozoic, yet their habitat is poorly understood. Three common ammonite families (Baculitidae, Scaphitidae, and Sphenodiscidae) co-occur with well-preserved planktonic and benthic organisms at the type locality of the upper Maastrichtian Owl Creek Formation, offering an excellent opportunity to constrain their depth habitats through isotopic ...

The present paper aims at the description of two new species Euthyneura (Heterobranchia: Gastropoda) in Early Jurassic (early Pliensbachian) marine deposits Chubut Basin southern Patagonia, Argentina. Cossmannina australis nov. sp. and Cylindrobullina caquelensis were found Cerro Caquel locality located western slope Sierra de Tecka río valley. yielded ammonite Eoamaltheus (E. meridianus Hilleb...