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View article: An updated correlation of the Silurian strata in Estonia
An updated correlation of the Silurian strata in Estonia Open
The correlation of the Silurian succession of Estonia with the global standard has long been considered reliable. However, new information, particularly on the distribution of microfossils, has changed our understanding of the Silurian str…
View article: Reconstruction of Phanerozoic climate using carbonate clumped isotopes and implications for the oxygen isotopic composition of seawater
Reconstruction of Phanerozoic climate using carbonate clumped isotopes and implications for the oxygen isotopic composition of seawater Open
The oxygen isotope ratio 18 O/ 16 O (expressed as a δ 18 O VSMOW value) in marine sedimentary rocks has increased by ~8‰ from the early Paleozoic to modern times. Interpretation of this trend is hindered by ambiguities in the temperature o…
View article: Late Ordovician scolecodonts and chitinozoans from the Pin Valley in Spiti, Himachal Pradesh, northern India
Late Ordovician scolecodonts and chitinozoans from the Pin Valley in Spiti, Himachal Pradesh, northern India Open
Tonarová, Petra, Suttner, Thomas J., Hints, Olle, Liang, Yan, Zemek, Marek, Kubajko, Michal, Zikmund, Tomáš, Kaiser, Jozef, Kido, Erika (2024): Late Ordovician scolecodonts and chitinozoans from the Pin Valley in Spiti, Himachal Pradesh, n…
View article: Noncalcified dasyclad algae from the Vasalemma Formation, late Sandbian (Late Ordovician) of Estonia
Noncalcified dasyclad algae from the Vasalemma Formation, late Sandbian (Late Ordovician) of Estonia Open
The Vasalemma Formation, late Sandbian, Late Ordovician in Estonia contains a previously unknown flora of noncalcified dasyclad algae. The Vasalemma Formation is a locally restricted limestone unit, which is predominantly composed of an ec…
View article: Oxygen isotope compositions of conodonts – analytical challenges of in situ SIMS studies
Oxygen isotope compositions of conodonts – analytical challenges of in situ SIMS studies Open
Reliable deep-time environmental and climate reconstructions are needed to understand the drivers of Earthâs system evolution over geological time. Palaeozoic temperature estimates, including reconstructions of the climate change through…
View article: Late Ordovician jawed polychaete fauna from the Spiti Valley, northern India
Late Ordovician jawed polychaete fauna from the Spiti Valley, northern India Open
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 re…
View article: Recent advances in the Ordovician stratigraphy of the Baltic Palaeobasin and Tornquist margin of Baltica
Recent advances in the Ordovician stratigraphy of the Baltic Palaeobasin and Tornquist margin of Baltica Open
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. The str…
View article: Searching for the Ordovician–Silurian boundary in Estonia, Latvia and Lithuania
Searching for the Ordovician–Silurian boundary in Estonia, Latvia and Lithuania Open
The present study focuses on determining the position of the lower boundary of the Silurian System in the eastern Baltic region. To achieve this, we conducted a comprehensive analysis of stable isotopic curves, combined with previously pub…
View article: Latest Ordovician age of the Spinachitina fragilis Chitinozoan Biozone in Baltoscandia
Latest Ordovician age of the Spinachitina fragilis Chitinozoan Biozone in Baltoscandia Open
The global Spinachitina fragilis Chitinozoan Biozone has been considered the lowermost Silurian zone in most publications. S. fragilis was first described from the Ohesaare drill core, Estonia, and utilised as a Baltic regional zonal taxon…
View article: A diverse Hirnantian scolecodont assemblage from northern Estonia and resilience of polychaetes to the end-Ordovician mass extinction
A diverse Hirnantian scolecodont assemblage from northern Estonia and resilience of polychaetes to the end-Ordovician mass extinction Open
We report the discovery of a rich assemblage of latest Katian and Hirnantian scolecodonts (polychaete jaws) from a new OrdovicianâSilurian boundary outcrop in the Reinu quarry, northern Estonia. The recovered polychaete fauna contains at…
View article: On future directions of Ordovician chitinozoan research
On future directions of Ordovician chitinozoan research Open
Chitinozoans have been known to science for nearly a century. Due to their biostratigraphic utility, chitinozoans were intensively studied from the 1960s to the 1980s, and they have an important place in Ordovician stratigraphy nowadays, a…
View article: Chitinozoan nomenclature and databases
Chitinozoan nomenclature and databases Open
In 1930, Alfred Eisenack suggested the term âchitinozoanâ for a microfossil group that he discovered from erratic boulders on the Baltic Sea coast. They are known from the Early Ordovician until the end of the Devonian and have a broad…
View article: Ordovician of the Eastern Baltic palaeobasin and the Tornquist Sea margin of Baltica
Ordovician of the Eastern Baltic palaeobasin and the Tornquist Sea margin of Baltica Open
This paper summarizes recent knowledge on the palaeontology, biostratigraphy, correlation, sea-level and climate history and isotopic geochemistry of the Ordovician rocks in the western and central parts of the East European Craton, in the…
View article: Early and early Middle Ordovician chitinozoans from the Baldone drill core, central Latvia
Early and early Middle Ordovician chitinozoans from the Baldone drill core, central Latvia Open
Early and early Middle Ordovician chitinozoans are relatively poorly known in Baltoscandia, thus the understanding of the early diversification of the group, as well as its biostratigraphic utility, is limited. In this paper, we document t…
View article: Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia
Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia Open
The Baltoscandian lower Palaeozoic succession is well known for the abundance, diversity and excellent preservation of various groups of microfossils, such as acritarchs, chitinozoans, scolecodonts and conodonts. This paper describes a new…
View article: Late diagenetic evolution of Ordovician limestones in the Baltoscandian basin revealed through trace-element mapping and in situ U–Pb dating of calcite
Late diagenetic evolution of Ordovician limestones in the Baltoscandian basin revealed through trace-element mapping and in situ U–Pb dating of calcite Open
Funding: supported by the Research Council of Norway project number 269842/F50 . OH and AL are grateful for the support from the Estonian Research Council Grant PRG836.
View article: Carbonate shelf development and early Paleozoic benthic diversity in Baltica: a hierarchical diversity partitioning approach using brachiopod data
Carbonate shelf development and early Paleozoic benthic diversity in Baltica: a hierarchical diversity partitioning approach using brachiopod data Open
The Ordovician–Silurian (~485–419 Ma) was a time of considerable evolutionary upheaval, encompassing both great evolutionary diversification and one of the first major mass extinctions. The Ordovician diversification coincided with global …
View article: Cryptic secondary cementation of Ordovician limestones in the Baltoscandian Basin, northern Europe, revealed through trace-element mapping and U-Pb dating by LA-ICP-MS
Cryptic secondary cementation of Ordovician limestones in the Baltoscandian Basin, northern Europe, revealed through trace-element mapping and U-Pb dating by LA-ICP-MS Open
<p>Primary phases in carbonate rocks archive a wealth of geochemical information about depositional conditions and environmental changes. Secondary phases may record additional&#8212;albeit more cryptic&#8212;information, pot…
View article: Fossilized reproductive modes reveal a protistan affinity of Chitinozoa
Fossilized reproductive modes reveal a protistan affinity of Chitinozoa Open
Reproduction is a key aspect of evolution, but the process is rarely preserved in the fossil record. Organisms fortuitously preserved undergoing reproduction provide an exceptional window illuminating the biology of extinct taxa, especiall…
View article: Small faecal pellets in Ordovician shelly fossils from Estonia, Baltoscandia
Small faecal pellets in Ordovician shelly fossils from Estonia, Baltoscandia Open
Coprolites (fossil faeces) constitute a group of soft sediment trace fossils that provide useful palaeoecological and sedimentological information, but have generally low preservational potential. In this paper we report abundant occurrenc…