Results 11 to 20 of about 460 (165)

Devonian geoheritage of Siberia: A case of the northwestern Kemerovo region of Russia [PDF]

open access: yesHeliyon, 2023
Southern Siberia demonstrates significant richness of the geological environment, but its uniqueness remains known poorly. Four geosites represent sections of Givetian–Famennian (Middle–Late Devonian) deposits formed in the tectonically active zone where
Jaroslav M. Gutak   +2 more
doaj   +2 more sources

Large Igneous Province Record Through Time and Implications for Secular Environmental Changes and Geological Time‐Scale Boundaries

open access: yesGeophysical Monograph Series, Page 1-26., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Richard E. Ernst   +8 more
wiley  

+10 more sources

A high latitude Gondwanan species of the Late Devonian tristichopterid Hyneria (Osteichthyes: Sarcopterygii) [PDF]

open access: yesPLoS ONE, 2023
We describe the largest bony fish in the Late Devonian (late Famennian) fossil assemblage from Waterloo Farm near Makhanda/Grahamstown, South Africa. It is a giant member of the extinct clade Tristichopteridae (Sarcopterygii: Tetrapodomorpha) and most ...
Robert W. Gess, Per E. Ahlberg
doaj   +3 more sources

Alpinites and other Posttornoceratidae (Goniatitida, Famennian) [PDF]

open access: yesFossil Record, 2002
The rediscovery of the supposedly lost type allows a revision of Alpinites Bogoslovskiy, 1971, the most advanced genus of the Posttornoceratidae. The type-species, Alp. kayseri Schindewolf, 1923, is so far only known from the Carnic Alps. Alp.
R. T. Becker
doaj   +7 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

Alasemenia, the earliest ovule with three wings and without cupule [PDF]

open access: yeseLife
The ovules or seeds (fertilized ovules) with wings are widespread and especially important for wind dispersal. However, the earliest ovules in the Famennian of the Late Devonian are rarely known about the dispersal syndrome and usually surrounded by a ...
Deming Wang   +6 more
doaj   +2 more sources

A high latitude Devonian lungfish, from the Famennian of South Africa [PDF]

open access: yesPeerJ, 2019
New fossil lungfish remains comprising two parasphenoids, tooth plates and scales from the Famennian Witpoort Formation of South Africa are described. From the parasphenoid material, which bears similarity to Oervigia and Sagenodus but is nevertheless ...
Robert W. Gess, Alice M. Clement
doaj   +3 more sources

Extreme abundance of ammonoids in mass accumulations from the Late Devonian of the Moroccan Anti-Atlas [PDF]

open access: yesActa Palaeontologica Polonica, 2022
The eastern Anti-Atlas is renowned for its highly fossiliferous outcrops of Devonian rocks. Ammonoids occur in rock-forming numbers at many localities in the Tafilalt and Maïder.
MERLE GREIF   +2 more
doaj   +1 more source

Devonian (Emsian-Famennian) Palynomorphs [PDF]

open access: yesJournal of Micropalaeontology, 1985
Abstract. EMSIANMiospore assemblages which can be positively assigned to the Early Devonian have, to date, only been recorded from core material from Well A1-33. Assemblages of Emsian age were recorded from the interval 8079 to 8091 ft. whilst assemblages from 8055 to 8076 ft.
Paris, F.   +4 more
openaire   +3 more sources

Carbon isotope values in conodont elements from the latest Devonian–Early Carboniferous carbonate platform facies (Timan-Pechora Basin) [PDF]

open access: yesEstonian Journal of Earth Sciences, 2018
The δ13Corg values and their variations in conodont elements of the latest Famennian–Tournaisian species Polygnathus parapetus Druce are considered. The conodonts studied come from the latest Famennian–Tournaisian interval of the Kamenka River section ...
Andrey V. Zhuravlev, Irina V. Smoleva
doaj   +1 more source

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