Spechts Ferry (Middle Ordovician) bryozoan fauna from Illinois, Wisconsin, and Iowa. [PDF]
, 1962 Information circular / Illinois State Geological
Perry, Thomas G. (Thomas Gregory), 1918-
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Journal of Geography (Chigaku Zasshi), 1960 This outlines the Ordovician system in Asia and comprises the following chapterrs.I. Introductory note.II. The Ordovician formations from Siberia to the Himalaya.III. The Ordovician formations in Eastern and Southeastern Asia.IV. The Ordovician formations from the Taymir peninsula to the Ural mountains through Northland and Novaya Zemlya.V.
Teiichi KOBAYASHI
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Recent advances in the Ordovician stratigraphy of the Baltic Palaeobasin and Tornquist margin of Baltica [PDF]
Estonian Journal of Earth Sciences, 2023 Ordovician rocks are widely distributed in the Baltoscandian region as well as in Poland, Belarus, Ukraine and Moldova. The Ordovician studies in this area were initiated in the 19th century in the outcrop belt in northern Estonia.
Tõnu Meidla +3 more
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Palaeozoic carbon isotope excursions and carbonate component analysis [PDF]
Estonian Journal of Earth Sciences, 2023 Palaeozoic carbonate δ13C studies have mainly focused on bulk rock analysis in chemostratigraphic correlations and palaeoenvironmental interpretations, assuming limited isotopic heterogeneity of samples.
Imre Andreas Martin +2 more
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Coupled extinction–regression episodes revisited in mid-oceanic settings for comparative extinction study during the Palaeozoic in view of non-bolide extraterrestrial causes [PDF]
Estonian Journal of Earth Sciences, 2023 Major change in the Earthâs surface temperature appears to be the most critical and universal factor for inducing coevally multiple kill mechanisms for organisms during the global environmental change episodes.
Yukio Isozaki
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Diversification and speciation among Laurentian brachiopods during the GOBE: insights from basinal and regional analyses [PDF]
Estonian Journal of Earth Sciences, 2023 Full understanding of diversity dynamics during the Great Ordovician Biodiversification Event (GOBE) requires analyses that investigate regional and species-level data and patterns. In this study, we combine bedding-plane scale data on brachiopod species
Alycia L. Stigall +5 more
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The detailed Middle to early Late Ordovician faunal succession and δ13Ccarbon chemistry of the Kårehamn drill core, offshore eastern Öland, Sweden: implications for stratigraphy and correlation [PDF]
Estonian Journal of Earth Sciences, 2023 The Middle to lower Upper Ordovician stratigraphy of the KÃ¥rehamn core, drilled ca 7 km offshore to the east of the KÃ¥rehamn village, northeastern Ãland, is presented. The investigated core is one of four drill cores obtained during the preparation of
Svend Stouge +4 more
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The earliest Ordovician trace fossils Cruziana and Rusophycus from Baltica [PDF]
Estonian Journal of Earth Sciences, 2023 Trace fossils of the ichnogenera Cruziana and Rusophycus are described for the first time from the Lower Ordovician of Baltica. These specimens were found from the upper Tremadocianâlower Floian glauconite sandstone of the Leetse Formation in the ...
Helje Pärnaste +2 more
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Ordovician enigmatic sclerite-type elements from western Argentina: possible oldest axial components of alcyonacean octocorals [PDF]
Acta Palaeontologica Polonica, 2021 The unusual findings of Lower and Middle Ordovician tiny sclerite-type elements in the San Juan Formation of the Argentine Precordillera are described and analysed.
Marcelo G. Carrera +3 more
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Changes in the morphology of Late Ordovician ostracods along the shelf-to-basin transect of the Baltic Palaeobasin [PDF]
Estonian Journal of Earth Sciences, 2022 The present work analyses the numerical distribution data of ostracods in the Late Ordovician (Katian) deposits of Estonia for establishing trends in carapace morphology along a facies profile from a shallow shelf to a deep basin.
Stefi Guitor, Tõnu Meidla
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