A new Cambrian catillicephalid trilobite from the Shallow Bay Formation of western Newfoundland, Canada [PDF]
Acta Palaeontologica Polonica, 2022 Species of Catillicephala are known from sites around the mid-Cambrian margin of Laurentian North America, including Vermont, Quebec, Newfoundland and North Greenland. Catillicephala cifellii sp. nov.
STEPHEN R. WESTROP, ALYCE A. DENGLER
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Developing a phylogenetic framework for tiny Ordovician brachiopods (Atrypida: Anazyginae and Catazyginae) from the eastern United States [PDF]
Estonian Journal of Earth Sciences, 2023 Elucidating how environmental change can facilitate the differentiation of evolutionary lineages and the establishment of new species is a critical issue for understanding both the history of life and modern biota. Notably, speciation events are known to
Mariana Vilela-Andrade +1 more
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Where are all the Ordovician sea cucumbers (Echinodermata)? [PDF]
Estonian Journal of Earth Sciences, 2023 The Ordovician Period witnessed the first evidence of appearance of all modern echinoderm clades as well as it is the most concentrated interval of echinoderm diversity in Earthâs history.
Mike Reich
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Upper Ordovician hardgrounds – from localized surfaces to global biogeochemical events [PDF]
Estonian Journal of Earth Sciences, 2023 Upper Ordovician hardgrounds display a spectrum of complexity reflecting a range of local to global-scale processes. Hardgrounds are cemented seafloor surfaces typically marked by the presence of encrusting taxa and borings.
Timothy R. Paton +4 more
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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
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Early Tremadocian graptolites from the Arivechi area, Sonora, northern Mexico [PDF]
Estonian Journal of Earth Sciences, 2023 Graptolites from the early Tremadocian Anisograptus matanensis Biozone are identified from east-central Sonora, northwestern Mexico, within a carbonate-shelf succession deposited on the southwestern continental shelf margin of Laurentia.
Dulce Raquel Reyes-Montoya +5 more
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First palaeoscolecid from the Cambrian (Drumian, Miaolingian) Marjum Formation of western Utah, USA [PDF]
Acta Palaeontologica Polonica, 2021 The middle Marjum Formation is one of five Miaolingian Burgess Shale-type deposits in Utah, USA. It preserves a diverse non-biomineralized fossil assemblage, which is dominated by panarthropods and sponges.
Wade W. Leibach +4 more
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Late Ordovician jawed polychaete fauna from the Spiti Valley, northern India [PDF]
Estonian Journal of Earth Sciences, 2023 The final part of the Ordovician Period was characterised by major perturbations in climate, environments and ecosystems, as proved by numerous studies. These changes resulted in one of the biggest extinctions in Earthâs history. Most research in early
Petra Tonarová +3 more
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Open Research Europe, 2023 Background The Svalbard Archipelago is commonly believed to have been located at comparable latitude and, possibly, to have been attached to Laurentia in the early Paleozoic (500–420 Ma) based on
Jean-Baptiste P. Koehl
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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
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