Abstract The standard reconstruction of species Orbitoides d’Orbigny into a single lineage during the late Santonian to end Maastrichtian is based upon morphometric data from Western Europe. An irreversible increase in size embryonic apparatus, and formation greater number epi-embryonic chamberlets (EPC) with time, regarded as main evolutionary trends used discrimination. However, assemblages C...

for biostratigraphic studies, based on calcareous nannofossils, a thickness of 480 meters of cretaceous deposits in shushud section (north birjand) has been measured and sampled. the studied section is composed of shale, marl, marine sandstone and sandy limestone. the shale and marl units were more suitable for sampling. according to taxonomical studies, 10 genera and 25 species in shushud sect...

A calcareous nannofossils biostratigraphic study has been carried out on the chalky limestones located in South Gorgan, north of Iran. The study is aimed at determining the age and nannofossil biozonations of the well. The samples were prepared using smear slide technique. Thirty seven calcareous nannofossils species were identified and used to make biostratigraphic zonations and dating of the ...

Bothremydidae is the most abundant clade of turtles in Campanian and Maastrichtian (Upper Cretaceous) fossil record southwestern Europe. Several members Foxemydina Gaffney, Tong & Meylan, 2006 are known an area that includes Southern France North-Eastern half Spain. The problematic ‘Polysternon’ atlanticum worst characterized, lacking a diagnosis allows its specific validity to be confirmed...

Calcareous nannofossil assemblages recovered from a long, continuous section have been described from the Sarayan region in Lut Block in east Iran. The marine Upper Cretaceous sediments of this section yield medium diverse and well-preserved calcareous nannofossil assemblages. A structural analysis of Upper Cretaceous calcareous nannofloras has revealed 30 nannofossil species. A revised zonatio...

The research area is located in south-eastern Slovenia and belongs to the eastern extensions of Slovenian Basin adjacent Adriatic Carbonate Platform. studied section 25 m thick consists grey, brownish reddish pelagic limestones calciturbidites, two bentonite layers 110 10 cm thick. Both volcanoclastic horizons consist greenish, fine-grained muddy material. To date, no other bentonites similar a...

Dinosaur fossils from the latest Cretaceous (Campanian–Maastrichtian) of Africa and Arabian Peninsula are rare. Most discoveries to date have consisted limited that precluded detailed phylogenetic paleobiogeographic interpretations. Fortunately, recent such as informative Egyptian titanosaurian sauropod dinosaur Mansourasaurus shahinae beginning address these long-standing issues. Here we descr...