Results 1 to 10 of about 39,712 (281)

The cranial endocast of the Upper Devonian dipnoan ‘Chirodipterus’ australis [PDF]

open access: yesPeerJ, 2018
One of the first endocasts of a dipnoan (lungfish) to be realised was that of the Upper Devonian taxon Chirodipterus australis. This early interpretation was based on observations of the shape of the cranial cavity alone and was not based on a natural ...
Struan A.C. Henderson, Tom J. Challands
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

UPPER FRASNIAN (UPPER DEVONIAN) BRYOZOANS IN PROXIMAL FACIES OF SOUTHERN BELGIUM

open access: yesRivista Italiana di Paleontologia e Stratigrafia, 2015
Seven bryozoan species are described from the shallow-water Aisemont and Lambermont formations (upper rhenana Conodont zone, upper Frasnian) in southern Belgium. The studied interval is situated between the lower and upper Kellwasser events.
ANDREJ ERNST   +2 more
doaj   +3 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

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

The smallest known Devonian tetrapod shows unexpectedly derived features [PDF]

open access: yesRoyal Society Open Science, 2020
A new genus and species of Devonian tetrapod, Brittagnathus minutus gen. et sp. nov., is described from a single complete right lower jaw ramus recovered from the Acanthostega mass-death deposit in the upper part of the Britta Dal Formation (upper ...
Per E. Ahlberg, Jennifer A. Clack
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

GOLD POTENTIAL OF THE UPPER DEVONIAN BASAL CONGLOMERATES OF THE KANIN PENINSULA (NENETS AUTONOMOUS DISTRICT, RUSSIA) [PDF]

open access: yesМинералогия, 2022
Native gold and garnets are described for the first time in heavy concentrates from coarse-grained sediments of the Upper Devonian Tayaokuyakha Formation, which occurs on the eroded Upper Riphean schists with angular and azimuthal unconformity (middle ...
M.A. Pavlova   +5 more
doaj   +1 more source

Devonian upper ocean redox trends across Laurussia: Testing potential influences of marine carbonate lithology on bulk rock I/Ca signals

open access: yesFrontiers in Marine Science, 2022
The Devonian is characterized by major changes in ocean-atmosphere O2 concentrations, colonialization of continents by plants and animals, and widespread marine anoxic events associated with rapid δ13C excursions and biotic crises. However, the long-term
Ruliang He   +5 more
doaj   +1 more source

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