Results 1 to 10 of about 1,800 (206)
Different controls on the Hg spikes linked the two pulses of the Late Ordovician mass extinction in South China [PDF]
Scientific Reports, 2022 The Late Ordovician mass extinction (LOME, ca. 445 Ma; Hirnantian stage) is the second most severe biological crisis of the entire Phanerozoic. The LOME has been subdivided into two pulses (intervals), at the beginning and the ending of the Hirnantian ...
Zhen Qiu +5 more
doaj +2 more sources
Katian (Upper Ordovician) conodonts from Wales [PDF]
Palaeontology, 2013 Middle and upper Katian conodonts were previously known in the British Isles from relatively small collections obtained from a few localities. The present study is mainly based on 17 samples containing more than 17 000 conodont elements from an ...
An +85 more
core +4 more sources
The late Katian Elkhorn event: precursor to the Late Ordovician mass extinction [PDF]
Estonian Journal of Earth Sciences, 2023 The late Katian Elkhorn event is a biogeochemical perturbation preceding the Late Ordovician mass extinction (LOME) with an exceptional record in the United States (U.S.).
Patrick I. McLaughlin +8 more
doaj +2 more sources
New Early Katian species of Leptestiidae and Hesperorthidae (Brachiopoda) from Lithuania [PDF]
Estonian Journal of Earth Sciences, 2016 A new leptestiid brachiopod species of the genus Sampo and a hesperorthid species of the genus Dolerorthis are described from the Early Katian Oandu Stage of southern Lithuania.
Juozas Paškevičius, Linda Hints
doaj +4 more sources
A Cenozoic-style scenario for the end-Ordovician glaciation. [PDF]
Nat Commun, 2014 The end-Ordovician was an enigmatic interval in the Phanerozoic, known for massive glaciation potentially at elevated CO2 levels, biogeochemical cycle disruptions recorded as large isotope anomalies and a devastating extinction event.
Ghienne JF +10 more
europepmc +10 more sources
Conodont biostratigraphy of the Oandu Stage (Katian, Upper Ordovician) in NE Estonia [PDF]
Estonian Journal of Earth Sciences, 2017 Conodonts from the type region of the Oandu Regional Stage (Katian, Upper Ordovician) in NE Estonia were studied. Here, the lower boundary of the stage corresponds to a discontinuity surface at the base of the Hirmuse Formation and, in conodont ...
Peep Männik
doaj +2 more sources
New late ordovician cornulitids from peru [PDF]
Palaeogeography, Palaeoclimatology, Palaeoecology, 2016 Two new species of cornulitids, Cornulites zatoni sp. nov. and Cornulites vilcae sp. nov., are described from the lower part (Sandbian) of the Calapuja Formation of south-western Peru. Late Ordovician cornulitid diversities of Peru (Gondwana) and Estonia
Gutiérrez-Marco, J. C., Vinn, Olev
core +2 more sources
Pathways and mechanisms of Late Ordovician (Katian) faunal migrations of Laurentia and Baltica [PDF]
Estonian Journal of Earth Sciences, 2015 Late Ordovician strata within the Cincinnati Basin record a mass faunal migration event during the C4 and C5 depositional sequences. The geographic source region for the invaders and the paleoceanographic conditions that facilitated dispersal into the ...
Adriane R. Lam, Alycia L. Stigall
doaj +2 more sources
Rivista Italiana di Paleontologia e StratigrafiaA low-diversity, relatively well-preserved brachiopod fauna is documented in detail for the first time from the Sandbian–Katian (Upper Ordovician) siliciclastic rocks of the Oxhe Inlier (Belgium), i.e.
Yves Candela +2 more
doaj +2 more sources
Upper Ordovician chronostratigraphic correlation between the Appalachian and Midcontinent basins [PDF]
Estonian Journal of Earth Sciences, 2023 Study of a subsurface core (named F688) from northern Indiana provides integrated data sets linking Katian chronostratigraphic records of the Appalachian and Midcontinent basins.
Cristiana J. P. Esteves +7 more
doaj +1 more source