Results 41 to 50 of about 7,296 (255)

Facies models of the Achimov Formation of East-Urengoiskoe license as the basis for optimizing exploration and field development patterns

open access: yesGeoresursy, 2020
The results of sedimentological core analysis of the Achimov Formation (Upper Valanginian, Lower Cretaceous) confirm that it was formed by higher efficiency systems of submarine fans in (relatively) deep marine basin.
Alena V. Khramtsova   +6 more
doaj   +1 more source

New Early Cretaceous Geosites with Palaeogeographical Value from the Northwestern Caucasus

open access: yesHeritage, 2022
Field investigations in the northwestern segment of the Greater Caucasus, a Late Cenozoic orogen, have permitted the establishment of two new geosites, namely the Ubin and Bezeps geosites.
Dmitry A. Ruban, Zoya A. Tolokonnikova
doaj   +1 more source

TECHNOLOGIES OF EXPOSING THE VALANGIAN DEPOSITS

open access: yesИзвестия высших учебных заведений: Нефть и газ, 2016
The problems arising when drilling horizontal and gently sloping wells in the Valanginian deposits are considered. The analysis of technologies of drilling-in the Valanginian reservoirs by sideholes using water-base clay drilling muds and the aerated ...
E. V. Panikarovski, V. V. Panikarovski
doaj   +1 more source

Linoporella buseri Radoičić, 1975, revisited: A Liassic dasycladalean alga from the Dinarides and continental Italy [PDF]

open access: yesGeološki Anali Balkanskoga Poluostrva, 2009
The Liassic Linoporella buseri is re-examined, on the basis of an abundant material of reefal origin, originating from the newly described type-locality in Slovenia. It is compared with the Berriasian-Valanginian type-species L.
Radoičić Rajka   +2 more
doaj   +1 more source

The Jurassic/Cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section (Outer Western Carpathians, the northern Tethyan margin) [PDF]

open access: yes, 2019
Microfacies and high resolution studies at the Kurovice quarry (Czech Republic, Outer Western Carpathians) on calpionellids, calcareous and non-calcareous dinoflagellate cysts, sporomorphs and calcareous nannofossils, aligned with paleomagnetism, allow ...
Elbra, Tiiu   +6 more
core   +1 more source

Sea surface temperature contributes to marine crocodylomorph evolution [PDF]

open access: yes, 2014
During the Mesozoic and Cenozoic, four distinct crocodylomorph lineages colonized the marine environment. They were conspicuously absent from high latitudes, which in the Mesozoic were occupied by warm-blooded ichthyosaurs and plesiosaurs.
Amiot, Romain   +3 more
core   +3 more sources

Tescheniceras gen. nov. (Ammonoidea) and the definition of the Valanginian/Hauterivian boundary in Butkov Quarry (Central Western Carpathians, Slovakia)

open access: yesActa geologica Polonica, 2020
Jurassic and Lower Cretaceous successions of the Manin Unit of the Central Western Carpathians are exposed in Butkov Quarry in the Middle Vah Region, Slovakia.
Z. Vašíček
semanticscholar   +1 more source

Faunal change in Cretaceous endemic shallow-marine bivalve genera/subgenera of the northeast Pacific [PDF]

open access: yes, 2020
Endemic shallow-marine Cretaceous bivalves in the northeast Pacific region (NEP), extending from southwestern Alaska to the northern part of Baja California Sur, Mexico, are tabulated and discussed in detail for the first time.
Squires, Richard L.
core  

Interhemispheric radio-astrochronological calibration of the time scales from the Andean and the Tethyan areas in the Valanginian–Hauterivian (Early Cretaceous)

open access: yesGondwana Research, 2019
An integrated radio-astrochronological framework of the Agrio Formation in the Andean Neuquen Basin of west-central Argentina provides new constraints on the age and the duration of the late Valanginian through Hauterivian stratigraphic interval. A CA-ID
B. Aguirre-Urreta   +15 more
semanticscholar   +1 more source

Theropod dinosaur diversity of the lower English Wealden: analysis of a tooth‐based fauna from the Wadhurst Clay Formation (Lower Cretaceous: Valanginian) via phylogenetic, discriminant and machine learning methods

open access: yesPapers in Palaeontology
The Lower Cretaceous Wealden Supergroup of southern England yields a diverse assemblage of theropod dinosaurs, its taxa being represented by fragments in addition to some of the most informative associated skeletons of the European Mesozoic. Spinosaurids,
Christopher Barker   +7 more
semanticscholar   +1 more source

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