Evolutionary history of the Gothograptus lineage of the Retiolitidae (Graptolithina) [PDF]
Estonian Journal of Earth Sciences, 2015 Evolutionary trends of the Gothograptus lineage (Graptolithina, Retiolitidae) from the lower Homerian to lower Ludfordian, Silurian are described. Gothograptids evolved towards simplification of the tubarium and decrease in the number of thecae.
Anna Kozłowska
doaj +1 more source
Biogeographic dynamics of graptolite species during the end-Ordovician mass extinction in South China [PDF]
Estonian Journal of Earth Sciences, 2023 Spatial and temporal analysis of geographical biodiversity dynamics and reconstruction of species distribution areas are essential for revealing the patterns of evolution of graptolites and their survival strategies during bio-events.
Qing Chen, Linna Zhang
doaj +1 more source
On the lower boundary of the Floian Stage in Estonia [PDF]
Estonian Journal of Earth Sciences, 2012 The lower boundary of the Second Stage of the Lower Ordovician Series, the Floian Stage, is defined by the first appearance of the graptolite Tetragraptus approximatus.
Helje Pärnaste, Viive Viira
doaj +1 more source
Ordovician collections stored at the National Museum of Natural History of the NAS of Ukraine [PDF]
Estonian Journal of Earth Sciences, 2023 We reviewed our departmentâs collections dealing with the Ordovician System, stored at the National Museum of Natural History of the National Academy of Sciences of Ukraine (NMNH NAS).
Galyna Anfimova, Volodymyr Grytsenko
doaj +1 more source
Ordovician graptolites from the basal part of the Palaeozoic transgressive sequence in the Karadere area, Zonguldak Terrane, NW Turkey [PDF]
Estonian Journal of Earth Sciences, 2014 The Karadere area to the east of Safranbolu in NW Anatolia is one of the very few localities in Turkey where the contact between the Cadomian basement and the Lower Palaeozoic transgressive succession is well exposed.
M. Cemal Göncüoglu +3 more
doaj +1 more source
Lower–Middle Ordovician brachiopods from the Eastern Cordillera of Peru: biostratigraphical and palaeobiogeographical significance [PDF]
Estonian Journal of Earth Sciences, 2023 LowerâMiddle Ordovician brachiopods are well known from the Central Andean Basin of Argentina and Bolivia, but relatively little data comes from its northern prolongation in the Altiplano and the Eastern Cordillera of Peru.
Jorge Colmenar +2 more
doaj +1 more source
A summary and revision of the East Baltic Silurian chitinozoan biozonation [PDF]
Estonian Journal of Earth Sciences, 2012 The biostratigraphical data on the East Baltic Silurian chitinozoans are summarized. Based on the study of nine East Baltic drill cores, 28 regional chitinozoan zonal units, including 26 biozones and 2 interzones, are briefly characterized. In comparison
Viiu Nestor
doaj +1 more source
More about the Ordovician–Silurian transition beds at Mirny Creek, Omulev Mountains, NE Russia: carbon isotopes and conodonts [PDF]
Estonian Journal of Earth Sciences, 2012 Profound environmental and biodiversity changes take place in the Ordovician–Silurian boundary interval. The Mirny Creek and Neznakomka River bank sections discussed in this paper expose the upper Katian–lower Rhuddanian part of the boundary beds.
Dimitri Kaljo +3 more
doaj +1 more source
Journal of Natural Gas Geoscience, 2018 The graptolitic shale of the Wufeng–Longmaxi Formations is widely deposited across the Ordovician and Silurian transition in South China, which is the target of shale gas exploration and development within China.
Zhen Qiu +9 more
doaj +1 more source
Age of the Kalana Lagerstätte, early Silurian, Estonia [PDF]
Estonian Journal of Earth Sciences, 2016 The Kalana quarry in central Estonia is known for its exceptionally well-preserved non-calcified algal and other fossils. The interval with the fossil Konservat Lagerstätte in the Kalana section has previously been tentatively dated as early Aeronian ...
Peep Männik +3 more
doaj +1 more source