Results 41 to 50 of about 325 (174)

A new species of the antiarch Microbrachius from the Middle Devonian (Givetian) of Belarus [PDF]

Estonian Journal of Earth Sciences, 2017
A new antiarch species Microbrachius kedoae n. sp. is described from the Middle Devonian (Givetian) of Belarus. The species is based on isolated dermal plates recovered from a borehole near the village of Gavrilchitsy about 25 km southwest of the city of
Elga Mark-Kurik, Michael J. Newman, Ursula Toom, Jan L. den Blaauwen   +3 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

Frontiers 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, Ruliang He, Maya Elrick, James Day, Wanyi Lu, Zunli Lu   +5 more
doaj   +1 more source

The Early Devonian (Emsian) acrotretid microbrachiopod Opsiconidion minor Popov, 1981, from the Alaska/Yukon Territory border and Novaya Zemlya [PDF]

Estonian Journal of Earth Sciences, 2020
New records of the poorly known acrotretid (Biernatidae) microbrachiopod Opsiconidion minor Popov are described from middle Emsian strata of the Ogilvie Formation in east-central Alaska and the adjacent Yukon Territory, Canada, and compared with new ...
Lars E. Holmer, Robert B. Blodgett, Yue Liang, Zhifei Zhang   +3 more
doaj   +1 more source

Ethmosphenoid endocasts elucidate evolutionary brain divergences and interrelationships of stem tetrapods (Sarcopterygii, Tetrapodomorpha)

Papers in Palaeontology, Volume 12, Issue 3, May/June 2026.
Abstract Nearly half of all living vertebrate diversity can be traced back to a single lineage of lobe‐finned fishes (piscine sarcopterygians) that radiated during the Palaeozoic Era. In recent years, the phylogenetic framework of tetrapodomorph fishes has largely stabilized, with the exception of the ‘Osteolepiformes’, the interrelationships of which ...
Alice M. Clement, Richard Cloutier, Oleg Lebedev, Tom J. Challands, Jing Lu, Joseph J. Bevitt, Laurent Houle, Shaun P. Collin, John A. Long   +8 more
wiley   +1 more source

A NEW SPECIES OF THE DEVONIAN ACTINOPTERYGIAN FISH MOYTHOMASIA FROM BELARUS

Rivista Italiana di Paleontologia e Stratigrafia
A new species of early actinopterygian fishes, Moythomasia lebedevi sp. nov., is described based on numerous isolated scales occurring in Middle Devonian (Givetian, Polotskian Regional Stage) marine deposits (Goryn, Stolin and Moroch Beds) of Belarus ...
DMITRY PLAX, ALEKSANDR BAKAEV, SERGEY NAUGOLNYKH   +2 more
doaj   +1 more source

New Zealand Geological Timescale 2025

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
New Zealand Geological Timescale 2025 (NZGT 2025) is the first comprehensive update and revision of the New Zealand Geological Timescale in a decade. The criteria used to establish age ranges of New Zealand Stages within the NZGT have been reviewed, calibrated, and revised where required against the 2023/04 International Chronostratigraphic Chart and ...
Christopher D. Clowes, James S. Crampton, Kyle J. Bland, J. Ian Raine, Andrew F. Boyes, Hamish J. Campbell, Erica M. Crouch, Martin P. Crundwell, Neville Hudson, Elizabeth M. Kennedy, Donald A. B. MacFarlan, Hugh E. G. Morgans, Marcus D. Richards, Matthew W. Sagar   +13 more
wiley   +1 more source

Sediment‐stressed reefs over the past 420 Myr

The Depositional Record, Volume 12, Issue 1, February 2026.
In order to fully elucidate the relationship between siliciclastic sedimentation and reef development, there needs to be a significant step change in how we record ancient and recent reefs. Only through the collection of constrained quantitative data, we can progress beyond the largely conjectural associations postulated for many ancient reefal systems.
Tanja Unger, Stephen W. Lokier, Markus Aretz, Matthieu Saillol, Adrian Immenhauser   +4 more
wiley   +1 more source

The Spatial and Temporal Evolution of Mixed Carbonate‐Clastic Mud‐Dominated Basin Fill Successions: The Middle to Late Devonian Shelf Margin, Western Canada

Basin Research, Volume 37, Issue 6, November/December 2025.
The spatial interplay between updip clastic and carbonate depositional systems and downdip detrital and biogenic mud dominated depositional systems are mapped temporally using the sequence stratigraphic method to predict the occurrence of aquifers, petroleum reservoirs and organic‐rich deposits. ABSTRACT Middle to Upper Devonian strata preserved in the
Rene Jonk, Kevin Bohacs, Ken Potma
wiley   +1 more source

New data on Karksiodus (Chondrichthyes) from the Main Devonian Field (East European Platform) [PDF]

Estonian Journal of Earth Sciences, 2014
New teeth belonging to Karksiodus mirus Ivanov & Märss (Chondrichthyes) were found together with putative chondrichthyan scales in five new localities of the Leningrad Region, northwestern Russia, within the Aruküla and Burtnieki regional stages ...
Alexander Ivanov, Tiiu Märss
doaj   +1 more source

Fish Assemblage from the Givetian (Middle Devonian) of the Kuznetsk Basin, Russia

Учёные записки Казанского университета: Серия Естественные науки
A diverse fish assemblage was reported from the Mazalovskiy Kitat and Alchedat beds (Givetian, Middle Devonian) of the Kuznetsk Basin (Siberia, Russia).
A. O. Ivanov, N. G. Izokh
doaj   +1 more source