Results 51 to 60 of about 230 (171)

Centimetre-scale variability of redox-sensitive elements in Tremadocian black shales from the eastern Baltic Palaeobasin [PDF]

Estonian Journal of Earth Sciences, 2014
The high-resolution study of vertical geochemical variability of shallow-water Tremadocian black shales of the Türisalu Formation targeted two drill core sections from Suur-Pakri Island, NW Estonia.
Rutt Hints, Alvar Soesoo, Margus Voolma, Siim Tarros, Toivo Kallaste, Sigrid Hade   +5 more
doaj   +1 more source

An Ordovician Assemblage of Cool Water‐Adapted Paleotropical Ostracods Suggests an Early Psychrosphere

Island Arc, Volume 34, Issue 1, January/December 2025.
ABSTRACT An ostracod assemblage from the Late Ordovician (Katian) Phu Ngu Formation of northern Vietnam, South China paleoplate, yields typical Baltic and Laurentian‐affinity genera together with some endemic forms. Detailed paleontological and sedimentary analysis of the Phu Ngu Formation suggests it was deposited in a deeper marine forearc setting ...
Anna McGairy, Phong Duc Nguyen, Mark Williams, Christopher P. Stocker, Thomas H. P. Harvey, Toshifumi Komatsu, Thomas W. Wong Hearing, C. Giles Miller, Chloé M. Marcilly, Alexandre Pohl   +9 more
wiley   +1 more source

Distribution of phosphorus in the Middle and Upper Ordovician Baltoscandian carbonate palaeobasin [PDF]

Estonian Journal of Earth Sciences, 2010
Baltoscandian Middle and Upper Ordovician carbonate rocks are relatively poor in phosphorus, with the P2O5 content of 0.05–0.5%, rarely exceeding 1%. Phosphorus distribution in the Ordovician carbonate succession shows spatial and temporal variations. In
Leho Ainsaar, Toivo Kallaste, Tarmo Kiipli, Enli Kiipli   +3 more
doaj   +1 more source

Lower–Middle Ordovician brachiopods from the Eastern Cordillera of Peru: evidence of active faunal dispersal across Rheic and Iapetus oceans

Papers in Palaeontology, Volume 10, Issue 5, September/October 2024.
Abstract New Floian and early middle Darriwilian brachiopod assemblages of the San José Formation of the Eastern Cordillera of Peru are presented. A new genus and species, Apurimella santiagoi, and two new species, Phragmorthis henrylunae and Nocturnellia ashaninka, are described.
Jorge Colmenar, César Augusto Chacaltana, Juan Carlos Gutiérrez‐Marco   +2 more
wiley   +1 more source

Biostratigraphy of Acritarchs and Chitinozoans in Ordovician Strata from the Fazel Abad Area, Southeastern Caspian Sea, Alborz Mountains, Northern Iran: Stratigraphic Implications [PDF]

Journal of Sciences, Islamic Republic of Iran, 2017
Sixty-four surface samples from the Lower Palaeozoic rock units (mainly Lalun,Abastu and Abarsaj formations) near Kholin-Darreh village in the Fazel Abad area,southeastern the Caspian Sea, Northern Iran, were analyzed to determine their agerelationships.
M. Ghavidel-syooki
doaj  

New group of the Early Palaeozoic conodont-like fossils [PDF]

Estonian Journal of Earth Sciences, 2015
The paper is devoted to the Upper Cambrian and Tremadocian organophosphatic microfossils which were hitherto treated as conodonts and assigned mainly to the genera Coelocerodontus and Viirodus.
Hubert Szaniawski
doaj   +1 more source

How to engineer a habitable planet: the rise of marine ecosystem engineers through the Phanerozoic

Palaeontology, Volume 67, Issue 5, September/October 2024.
Abstract Ecosystem engineers are organisms that modify their physical habitats in a way that alters resource availability and the structure of the communities they live in. The evolution of ecosystem engineers over the course of Earth history has thus been suggested to have been a driver of macroevolutionary and macroecological changes that are ...
Alison T. Cribb, Simon A. F. Darroch
wiley   +1 more source

ACRITARCHS AND CONODONTS FROM THE CAMBRO - ORDOVICIAN FURUHÄLL (KÖPINGSKLINT) SECTION (ÖLAND, SWEDEN)

Rivista Italiana di Paleontologia e Stratigrafia, 2020
Cambrian to Lower Ordovician acritarchs and Lower Ordovician conodont species have been recorded from the Furuhäll Section at Köpingsklint on Öland, Sweden. The acritarchs are represented by three different microfloras.
GABRIELLA BAGNOLI, SVEND STOUGE, MARCO TONGIORGI   +2 more
doaj  

Palaeoscolecids from the Ludlow Series of Leintwardine, Herefordshire (UK): the latest occurrence of palaeoscolecids in the fossil record

Papers in Palaeontology, Volume 10, Issue 3, May/June 2024.
Abstract The documentation of cuticular micro‐ornament is vital for the taxonomic assignment of palaeoscolecids: vermiform lower Palaeozoic ecdysozoans interpreted as stem‐group priapulans or early diverging panarthropods. This is due to the absence of the character‐rich proboscis and tail hooks in palaeoscolecid material not from Burgess Shale‐type ...
Richard J. Howard, Luke A. Parry, Innes Clatworthy, Leila D'Souza, Gregory D. Edgecombe   +4 more
wiley   +1 more source

Improving Mercury Systematics With Molybdenum and Vanadium Enrichments: New Insights From the Cambrian‐Ordovician Boundary

Geophysical Research Letters, Volume 51, Issue 8, 28 April 2024.
Abstract The Cambro‐Ordovician interval marks a significant transition from extinction to bio‐diversification in deep time. However, the relationship of bio‐transition to volcanism, commonly characterized by mercury (Hg) systematics in sedimentary records, has not been examined.
Leibo Bian, Anthony Chappaz, Xiaomei Wang, David Amouroux, Niels Hemmingsen Schovsbo, Xiaowei Zheng, Hamed Sanei   +6 more
wiley   +1 more source