Results 1 to 10 of about 3,229 (164)

Nostolepis scale remains (stem Chondrichthyes) from the Lower Devonian of Qujing, Yunnan, China [PDF]

open access: yesPeerJ, 2021
Based initially on microfossils, Nostolepis is one of the first known ‘acanthodians’, which constitute a paraphyletic assemblage of plesiomorphic members of the total group Chondrichthyes.
Qiang Li   +6 more
doaj   +3 more sources

PROBLEM OF THE INTERNATIONAL CHRONOSTRATIGRAPHIC CHART OF LOWER DEVONIAN AND STRATIGRAPHIC BOUNDARIES OF LOWER DEVONIAN STAGES IN SOUTHERN TIAN SHAN

open access: yesЗаписки Горного института, 2018
The boundaries of the International Chronostratigraphic Chart (ICC) are associated with the natural historical stages of the Earth's development, and their boundaries are usually determined by the palaeogeographical or palaeobiological event that is ...
E. D. Mikhailova, A. I. Kim
doaj   +3 more sources

A new origin of the ‘modern’ lungfish dentition revealed by taxonomic overlap between Devonian and Carboniferous dipnoans [PDF]

open access: yesPeerJ
Lungfishes (Dipnoi, Sarcopterygii) initially radiated in the Early Devonian, and reached the apogee of their diversity during this period, especially with regard to their dentitions.
Amin El Fassi El Fehri   +4 more
doaj   +3 more sources

New insights into the South China Lower Devonian flora based on fossils from Hezhang, Guizhou Province [PDF]

open access: yesPhilosophical Transactions of the Royal Society B: Biological Sciences, 2022
Jiao Bai, Hong-He Xu
exaly   +2 more sources

Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard [PDF]

open access: yesSolid Earth, 2021
The present study of field, petrological, exploration well, and seismic data describes backward-dipping duplexes comprised of phyllitic coal and bedding-parallel décollements and thrusts localized along lithological transitions in tectonically thickened ...
J.-B. P. Koehl   +3 more
doaj   +1 more source

Hydro-Chemical Study with Geospatial Analysis of Groundwater Quality Illizi Region, South-East of Algeria [PDF]

open access: yesIranian Journal of Chemistry & Chemical Engineering, 2021
For the aim of evaluating the physical and chemical groundwater quality of six layers (the Lower Devonian, Mio Pliocene, Infero Flux, Cambro Ordovician, Albian, and Zaraitine in Illizi, and to identify the sources of its chemical composition and detect ...
Saber Kouadri, Kateb Samir
doaj   +1 more source

Biostratigraphy of conodonts and foraminifera of Upper Devonian - Lower Permian of the Padimey Area (north-east of Timan-Pechora petroleum Province) - new data [PDF]

open access: yesНефтегазовая геология: Теория и практика, 2022
The article considers new data on the biostratigraphy of the Upper Devonian Lower Permian of the Padimey Area (Vorkuta transverse uplift of the Cis-Uralian depression).
Zhuravlev A.V., Vevel Ya.A.
doaj   +1 more source

Perspectives for oil and gas Paleozoic bearing strata on the junction area of the Pre-Caspian and Volga-Ural petroleum Provinces [PDF]

open access: yesНефтегазовая геология: Теория и практика, 2022
The junction zone of such large tectonic structures as the Volga-Ural anteclise, Precaspian depression and Pre-Ural foredeep is characterized by a very complex tectonic structure, history of geological development and formation at different phases of ...
Fortunatova N.K.   +11 more
doaj   +1 more source

Chondrichthyans from the Devonian–Early Carboniferous of Belarus [PDF]

open access: yesEstonian Journal of Earth Sciences, 2018
Diverse remains of chondrichthyans were found in several stratigraphic levels in 18 cores of the Devonian and Lower Carboniferous of Belarus. Most of the taxa were first reported in that territory. A new species of ctenacanthiform shark, Tamiobatis elgae,
Alexander O. Ivanov, Dmitry P. Plax
doaj   +1 more source

Devonian–Carboniferous extension and Eurekan inversion along an inherited WNW–ESE-striking fault system in Billefjorden, Svalbard [version 2; peer review: 2 approved, 1 not approved]

open access: yesOpen Research Europe, 2023
Background The Billefjorden area in central Spitsbergen hosts thick Lower–lowermost Upper Devonian, late–post-Caledonian collapse deposits presumably deformed during the Late Devonian Svalbardian Orogeny.
Lis Allaart   +2 more
doaj   +1 more source

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