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Revision of the Tribe Xyelini (Hymenoptera: Xyelidae) and New Fossil Records from the Lower Cretaceous of Liaoning Province, China [PDF]

open access: yesInsects
Three new species—Enneoxyela aculeata sp. nov., Enneoxyela eucalla sp. nov., and Hemixyela elongata gen. et sp. nov.—are described and illustrated from the Lower Cretaceous Yixian Formation at Huangbanjigou, Liaoning Province, China.
Xiaoqin Li   +2 more
doaj   +2 more sources

Palynofacies and Palaeoenvironment of the Sanganeh Formation, East and the Center of the Kopet-Dagh Basin [PDF]

open access: yesJournal of Stratigraphy and Sedimentology Researches, 2021
In order to identify the palynofacies and to reconstruct the paleoenvironment of the Lower Cretaceous depositions in the Kopet-Dagh sedimentary basin, the Sanganeh Formation was sampled and studied.
Narges Shokri   +2 more
doaj   +1 more source

Study of microfacies and interpretation of sedimentary environment of the Lower Cretaceous succession at Markesh Mountain in the north of Ravar [PDF]

open access: yesJournal of Stratigraphy and Sedimentology Researches, 2021
Lower Cretaceous deposits are outcropped in the Markesh Mountain, 15 km north of Ravar (Kerman Province), with a thickness of 143 m, and this section includes intercalation of gypsiferous marls, thin-bedded limestones, thin- to medium-bedded limestones ...
Madineh Kiani shahvandi   +1 more
doaj   +1 more source

Uranium metallogenic model of the Lower Cretaceous in the northern Ordos Basin

open access: yes地质科技通报, 2023
Since 2019, major breakthroughs have been made in the prospecting of the Lower Cretaceous sandstone-type uranium deposits in the northern Ordos Basin.
Longhui Wang   +8 more
doaj   +1 more source

Facial-paleogeographic reconstructions of the Valanginian-Hauterivian strata belonging to the Lower Cretaceous Gydan Peninsula and the western part of the Yenisei-Khatanga regional foredeep [PDF]

open access: yesНефтегазовая геология: Теория и практика, 2021
Paleogeographic reconstructions were carried out, sedimentation models were determined, and facies-paleogeographic maps were constructed for the Valanginian-Hauterivian clinoform structures of the Lower Cretaceous of the Gydan Peninsula and the western ...
Taninskaya N.V.   +7 more
doaj   +1 more source

Characterization of the Lower Cretaceous Shale in Lishu Fault Depression, Southeastern Songliao Basin: Implications for Shale Gas Resources Potential

open access: yesEnergies, 2022
Large thickness of shales over 180.0 m was developed in the source rocks of the Shahezi and Yingcheng formations in the Lishu Fault Depression. Moreover, the high amount of gas content and the total hydrocarbon value of gas logging in several boreholes ...
Qilai Xie, Hao Xu, Shuang Yu
doaj   +1 more source

Dinosaur Tracksites from the Maestrazgo UNESCO Global Geopark (Teruel, Spain) [PDF]

open access: yesGeoconservation Research, 2021
Numerous Upper Jurassic–Lower Cretaceous tracksites are found in the Maestrazgo UNESCO Global Geopark; sauropod and ornithopod tracks are abundant and there are some rare stegosaurians and theropods.
Luis Alcalá, Alberto Cobos
doaj   +1 more source

Well-preserved cuticle of Atherfieldastacus magnus (Decapoda, Glypheida) from the Aptian of Mexico

open access: yesGeologija, 2020
The cuticle structure of fossil decapod crustaceans is an important tool, not only for palaeocological and taphonomic interpretations, but also as a potential way to characterise systematically genera and even species the cuticle of which has not been ...
Oscar GONZÁLEZ-LEÓN   +3 more
doaj   +1 more source

Sedimentary Characteristics and Their Controlling Factors of Lower Cretaceous Fan Deltas in Saidong Sub-Sag of Saihantala Sag, Erlian Basin, Northeastern China

open access: yesEnergies, 2022
Fan deltas of the Lower Cretaceous area in Saihantala sag, Erlian Basin have been identified as major petroleum exploration opportunities. The sedimentary evolution is, however, still debatable, which hinders insights into its controlling factors.
Bo Yan   +4 more
doaj   +1 more source

A facies and palaeogeography-based approach for analysis of petroleum systems in United Arab Emirates

open access: yesJournal of Palaeogeography, 2018
The United Arab Emirates (UAE) is the 8th largest oil producing country and is rich in oil and gas resources. By the end of 2015, 68 oil and 23 gas fields had been discovered.
Shu-Zheng Yin   +3 more
doaj   +1 more source

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