The geoeducation area (called also “Owadów-Brzezinki Geopark”) located in the north-western margin of the Holy Cross Mountains (Tomaszów Syncline) at Sławno community (Łódź Voivodeship), was ...established in June 2019, in close vicinity of the Owadów-Brzezinki quarry. This locality is one of the most important palaeontological sites described recently in Poland. The area consists of the exhibition pavilion, educational routs and panoramic viewing platform, which is located along the edge of the quarry. The palaeontological exhibition shows the unique Late Jurassic fossils of marine and terrestrial organisms, many of them new to science, that have been excavated in the quarry during the last eight years. Among the most important fossils are: ammonites, lobster-like decapod crustaceans, horseshoe crabs, actinopterygian fish, a cryptodiran turtle, ichthyosaurs, as well as a small terrestrial crocodyliform, pterosaurs and insects. In addition to the original fossils, the exhibition presents life-size reconstructions of animals, that inhabited the local seas and islands during the Late Jurassic. The palaeontological sites of Owadów-Brzezinki is referred to as a new “taphonomic window” of the Late Jurassic, providing insights about the evolution of life on Earth in the palaeogeographical and palaeoenvironmental context.
A 40-m-thick carbonate succession of the Bajocian to Berriasian age from the Veliky Kamenets quarry (Novoselica area, Pieniny Klippen Belt, Ukraine) resembles both the Czorsztyn and Niedzica ...successions of the Pieniny Klippen Belt, traditionally considered ridge slope-related deposits. A total of 176 individually oriented cores, collected from the bottom to the top of the sequence with sampling density dependent on inferred sedimentation rates, show multicomponent remanent magnetization with magnetite as a main magnetic carrier. Thermal demagnetization revealed two main components of natural remanent magnetization (NRM). A low-blocking temperature component
S of normal polarity is considered of posttectonic, probably thermoviscous, origin due to overheating by Neogene volcanics. A stable, high-blocking temperature NRM component
P shows dual-polarity distribution and is considered primary. It was possible to recognize 23 polarity zones that have been correlated with a biostratigraphic scale. Since two significant sedimentary gaps occur at 422 and 860 cm (the main hiatus—MS) from the base, the latter comprising the Middle Callovian/Early Oxfordian time span (6–8 Ma), an obtained pattern of magnetic reversals presented in this study cannot be considered complete. A palaeolatitude of 41±5° is calculated for the mid-Jurassic part below MS, similar to that expected for the European Craton at the Kamenets locality. The mid-Oxfordian limestone, directly overlying the MS, has palaeolatitudes around 28±6°. This implies a relatively fast opening of the oceanic domain to the north from the Kamenets block. This conclusion, combined with similarity of the Kamenets sequence to ridge-related sediments of the Pieniny Klippen Belt, makes it possible to speculate on the existence of the Kamenets Ridge (a new term), a structure of uncertain, although possible, structural links to the Czorsztyn Ridge. Palaeomagnetic declinations suggest 100° counterclockwise rotation of the whole section before the Neogene.
A magnetic polarity pattern for Boreal and Sub-Boreal ammonite zones of the Upper Oxfordian to Lower Kimmeridgian was established and confirmed in four British sections, including the proposed Global ...Boundary Stratotype Section and Point (GSSP) on the Isle of Skye (Scotland) to define the base of the international Kimmeridgian Stage. A coeval pattern for Sub-Mediterranean ammonite zones was compiled from seven sections in Poland, one German section and multi-section composites from France and Spain. The mean paleopole for the European Craton (excluding Spain) at the Oxfordian–Kimmeridgian boundary is 74.2°N, 181.3°E (
Α
95
=
3.8°). The common magnetic polarity scale enables inter-correlation of ammonite subzones among these three faunal provinces and to the marine magnetic-anomaly M-Sequence. The proposed GSSP at the base of the
Pictonia baylei Zone is near the base of an extended interval dominated by reversed polarity, which is interpreted to be Chron M26r. This GSSP level projects to the lower to middle part of the
Epipeltoceras bimammatum Subzone, which is the middle subzone of this
E. bimammatum Zone in the Sub-Mediterranean standard zonation. In contrast, the traditional placement of the Oxfordian–Kimmeridgian boundary in that Sub-Mediterranean standard zonation (base of
Sutneria platynota Zone) is at the base of Chron M25r, or nearly 1
million years younger.
A rich Kimmeridgian ammonite fauna is described from the Janusfjellet Subgroup at Holmgardfjellet, Agardhbukta, east Spitsbergen. The fauna collected from a narrow stratigraphic interval represents a ...single ammonite assemblage showing a wide but continuous range of variability, with end-forms strongly resembling Amoeboceras (Hoplocardioceras) decipiens Spath and A. (Amoebites) elegans Spath, respectively. Accepting a horizontal classification in ammonite taxonomy, the assemblage may easily be placed into a single species for which the name Amoeboceras (Amoebites) uralense Mesezhnikov, 1973, is available, as this form corresponds to the intermediate and the most common morphotype. The fauna with A. uralense is possibly directly below that with A. elegans and A. decipiens, but above that with A. kochi. Close phyletic relations are suggested between the A. elegans - A. uralense group (traditionally placed in the subgenus Amoebites) and the subgenera Hoplocardioceras (type species A. decipiens), and Euprionoceras (type species A. kochi).
A rich Kimmeridgian ammonite fauna is described from the Janusfjellet Subgroup at Holmgardfjellet, Agardhbukta, East Spitsbergen. The fauna collected from a narrow stratigraphic interval represents a ...single ammonite assemblage showing a wide but continuous range of variability, with end‐forms strongly resembling Amoeboceras (Hoplocardioceras) decipiens Spath and A. (Amoebites) elegans Spath, respectively. Accepting a horizontal classification in ammonite taxonomy, the assemblage may easily be placed into a single species for which the name Amoeboceras (Amoebites) uralense Mesezhnikov, 1973, is available, as this form corresponds to the intermediate and the most common morphotype. The fauna with A. uralense is possibly directly below that with A. elegans and A. decipiens, but above that with A. kochi. Close phyletic relations are suggested between the A. elegans ‐ A. uralense group (traditionally placed in the subgenus Amoebites) and the subgenera Hoplocardioceras (type species A. decipiens), and Euprionoceras (type species A. kochi).
Pyroclastic material of a rhyolite type is present in some thin layers in the upper part of the De Geerdalen Formation in the Sassenfjorden area. This is the first evidence of late Triassic ...(Norian.Rhaetian) volcanic activity in Svalbard.
Pyroclastic material of a rhyolite type is present in some thin layers in the upper part of the De Geerdalen Z Formation in the Sassenfjorden area. This is the first evidence of late Triassic (Norian ...Rhaetian) volcanic activity in Svalbard.
MicroRNAs mediate posttranscriptional gene regulation. The aim of the study was to find a microRNA predictor of successful atrial fibrillation (AF) ablation. A total of 109 patients undergoing ...first-time AF ablation were included. Nineteen patients were selected to undergo serum microRNA sequencing (study group). The sequencing data were used to select several microRNAs that correlated with 12-month recurrences after AF ablation. Those microRNAs were validated by digital droplet PCR in samples from remaining 90 patients. All patients underwent pulmonary vein isolation (RF ablation, contact force catheter, electroanatomical system). The endpoint of the study was the 12-month AF recurrence rate; the overall recurrence rate was 42.5%. In total, levels of 34 miRNAs were significantly different in sera from patients with AF recurrence compared to patients without AF recurrence. Six microRNAs (miR-183-5p, miR-182-5p, miR-32-5p, miR-107, miR-574-3p, and miR-144-3p) were validated in the whole group. Data from the validation group did not confirm the observations from the study group, as no significant differences were found between miRNAs serum levels in patients with and without recurrences 12 months after AF ablation.
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