detailed organic petrography analysis were conducted on drill core and cutting samples from the nahr umr (middle albian), burgan (lower albian) and ratawi (hauterivian) formations on the soroosh and nowrooz fields, nw part of the iranian sector of the persian gulf. the thermal maturity of the middle albian nahr umr formation appears to have reached the top of the oil window. the underlying burg...

The main purpose of this study is to estimate hydrocarbon potentialities Yamama Formation (Valanginian–Early Hauterivian) by using assessment technique links up between gamma ray spectrometry logs and other conventional open hole for determining the petrophysical properties units in Subba oil-field oil water contact as well. Lower (YB); considered reservoir unit, aptly composed shallow high dep...

Herein are presented the results of detailed bio- (calcareous dinocysts, calpionellids, foraminifers, saccocomids) and chemostratigraphic (δ13C) studies combined with high-resolution microfacies, rock magnetic and gamma-ray spectrometry (GRS) investigations performed on upper Kimmeridgian–upper Valanginian carbonates of Giewont succession (Tatricum, Maly sections, Western Tatra Mountains, Polan...

The Ksar Metlili Formation, from the Jurassic – Cretaceous transition (Tithonian Berriasian) of eastern High Atlas Mountains, Morocco, has yielded one richest microvertebrate assemblages Mesozoic Gondwana. With at least 19 species, mammaliaforms are particularly diverse. ‘Dryolestoidea’ most abundant and diverse; nevertheless, only Donodon perscriptoris Sigogneau-Russell, 1991a, monotypic Donod...

Xenoposeidon proneneukos gen. et sp. nov. is a neosauropod represented by BMNH R2095, a well-preserved partial mid-to-posterior dorsal vertebra from the Berriasian– Valanginian Hastings Beds Group of Ecclesbourne Glen, East Sussex, England. It was briefly described by Lydekker in 1893, but it has subsequently been overlooked. This specimen’s concave cotyle, large lateral pneumatic fossae, compl...

Lower Cretaceous carbonate successions outcrop extensively along the northern Tethyan margin in Kopet-Dagh (NE Iran) and Yazd Block (Central Iran). These units are not well constraint terms of stratigraphic, sedimentological, geochemical, paleobiogeographic view point. To improve our knowledge, a detailed multidisciplinary study has been presented on two roughly coeval stratigraphic different a...

The rift phase of the Campos Basin developed during Early Cretaceous on a heterogeneous crust comprising structures inherited from Brasiliano-Pan African tectonic events, mostly generated Neoproterozoic-Cambrian amalgamation western Gondwana blocks. main rifting episode took place Hauterivian to Barremian, then was succeeded by transition and post-rift (SAG) phases Aptian. Rift faults as result...

Abstract In the Alpstein massif of north-eastern Switzerland, a complete succession uppermost Hauterivian to Barremian condensed hemipelagic sediments crops out. This is known as Tierwis Formation, comprising in ascending order, Altmann and Drusberg members. The sedimentary bears number fossiliferous glauconite- or phosphate-rich beds. A large newly discovered ammonites from these key beds seve...