Karol Jewuła

Polish Academy of Sciences | PAN · Institute of Geological Sciences

Despite years of research, palaeosalinity remains one of the most difficult palaeoenvironmental proxies to reconstruct. Numerous approaches have been proposed. Those utilising boron, gallium, strontium, barium, and potassium are among the most commonly used in palaeoenvironmental reconstructions. The comparison of chemical and mineralogical data ob...

The transition from the late Permian to Early Triassic was associated with one of the biggest biotic crises in the entire Phanerozoic which affected life in both marine and continental settings. Unlike in the marine realm, the environmental dynamics in continental palaeoenvironments across the Permian-Triassic interval are still poorly understood....

Mineralogical and geochemical compositions of mudstones were used for untangling provenance and climatic signals preserved in the upper Ediacaran-lower Cambrian strata from the western part of the East European Craton (ECC). Quantitative mineralogy and geochemistry data were obtained for 735 argillaceous rock samples from 71 wells and outcrops and...

An important part of the Upper Permian (Zechstein) sequence in the Holy Cross Mountains (HCM) in Poland comprises continental carbonate facies where dryland and wetland depositional environments dominated the southeastern part of the Southern Permian Basin. Sedimentological and thin-section microfacies analysis of over 860 m of core from seven well...

In the Triassic‒Jurassic boundary profiles of the Upper Silesian region, there are locally developed coarse clastic deposits, commonly known as the Połomia Gravels, Połomia Beds or “Połomia Formation’’ (informal name). Due to the lack of reliable stratigraphic tools, the chronostratigraphic position of these deposits remains one of the most controv...

This report provides oxygen isotopes from apatite of late Middle and Late Ordovician conodonts from the southern Holy Cross Mountains in south-eastern Poland. It was a unique time interval characterised by a significant change in the Ordovician climate, tectonic, and ocean chemistry. In the Middle and early Late Ordovician, the Holy Cross Mountains...

The geosite Zygmuntówka (Sigismund ) quarry, located at Czerwona Góra near Chêciny in SW part of the Holy Cross Mountains, is the oldest and the most famous among the so-called Chêciny “marble” quarries which provided stones for constructing numerous important buildings in the region and beyond. Upper Permian conglomerates (Czerwona Góra Formation)...

Polish Abstract (English to follow): Podczas trwania całego okresu triasu zakłada się, że temperatura oceanu Tetydy była o kilka-kilkanaście stopni wyższa od panującej we współczesnych mórzach a pod koniec smitu (ok. 250,7 mln lat), w strefie równikowej, mogła osiągać nawet 40°C przy powierzchni. Ten, wyjątkowy w historii Ziemi wzrost temperatury...

Podczas trwania całego okresu triasu zakłada się, że temperatura oceanu Tetydy była o kilka-kilkanaście stopni wyższa od panującej we współczesnych mórzach a pod koniec smitu (ok. 250,7 mln lat), w strefie równikowej, mogła osiągać nawet 40°C przy powierzchni. Ten, wyjątkowy w historii Ziemi wzrost temperatury został nazwany Późnosmickim Maksimum T...

The dry climate that prevailed during the Triassic period in the eastern part of the Central European Basin was interrupted by several humid episodes of varying durations. One of them was the Carnian Pluvial Episode (CPE), which took place in the late Julian (early Carnian age) and is confined to Camerosporites secatus and Aulisporites astigmosus p...

We studied the upper Permian and Lower Triassic deposits from the northern and northwestern marginal part of theHoly Cross Mountains (SE part of the Central European Basin orCEB, Poland) to examine stratigraphic continuity between these two systems, and to revise the currently existing stratigraphic framework. A previously existing informal lithost...

Prevailing dry climate during the Triassic period in the eastern part of the Central European Basin was interrupted by short-time humid events and longer phases. One of them was Carnian Pluvial Phase which took place in the Julian (Early Carnian) correlated to the Aulisporites astigmosus palynological zone. It is recorded by a significant change in...

Triassic strata start with either red, non-calcareous, micaceous siltstone with sparse small rhizoconcretions (Szczukowice Formation-Figure 4G) or cross-laminated medium grained sandstone with red siltstone clasts of Jaworzna Formation (Figure 4H). The striking difference between the Late Permian and Early Triassic soils is highlighted by significa...

Free access available: https://authors.elsevier.com/a/1Y4yW8RVhnJWb The numerous discoveries of disintegrated skeletons of large terrestrial vertebrates within several thin levels of the Upper Silesian Keuper initiated broad investigations into the palaeoenvironment and age of the bone-bearing sediments. Despite years of research, the deposition...

In order to mitigate predrill uncertainties and provide the well team with the best information to drill proactively, monitoring of borehole operations in realtime is vital on wells drilled today. Realtime monitoring (Pore Pressure while Drilling – PPwD) gives the team the best chance to drill the well safely and efficiently to planned targets. Rec...

At least three widely separated bone-bearing intervals in the Upper Triassic succession of Upper Silesia, ranging in age from the Carnian to Rhaetian (i.e., in the interval of 25 Ma), are presented in papers of the Warsaw research group, led mostly by Jerzy Dzik and/or Grzegorz Niedźwiedzki. The stratigraphic arguments are reviewed for so far studi...

The stratigraphy of the Upper Silesian Keuper, a continental mudstone-dominated is poorly known, although the already renowned, newly-discovered vertebrate localities highlight a growing demand for a more precise intra-regional correlation and an appropriate stratigraphic context. A major lithostratigraphic unit, preliminarily proposed for the midd...

Palaeomagnetic results are presented for 205 samples of cores from the Ksiaz Wielkopolski IG-2, Wozniki K-1 and Patoka-1 wells, drilled in the Polish part of Germanic Basin. The magnetic polarity stratigraphy is based on the inclination of the characteristic remanent magnetization, isolated in 60% of the total samples and found to be in general agr...

At least three widely separated, bone-rich intervals in the Upper Triassic succession of Upper Silesia, ranging in age from Carnian to Rhaetian (i.e., an interval of 30 myr), have been presented in papers by the Warsaw research group, led mostly by Jerzy Dzik and/or Grzegorz Niedźwiedzki. Their stratigraphic arguments are reviewed, in order to show...

Mudstones and claystones from the southern marginal area of the European Upper Triassic, midcontinental Keuper basin (Silesia, southern Poland) were investigated using XRD, organic and inorganic geochemistry, SEM, K-Ar of illite-smectite, AFT, and stable isotopes of O and C in carbonates in order to unravel the consequent phases of the geological h...

Fluvial sediments of the Keuper group from southern Poland comprise rich assemblage of terrestrial vertebrates. Fluvial environments favour various biological activities. One of this findings occurs in Lipie Śląskie (Upper Silesia region), where “Fossillagerstätten” are embedded in approximately 8 m succession of fluvial sandstones, siltstones and...