Daniela Rehakova

Comenius University Bratislava · Faculty of Natural Sciences

Over the vast area of present‐day Europe, the Tithonian–Berriasian transition was a time of climate aridization, which was supposedly related to the more general trend of the latest Jurassic–earliest Cretaceous cooling and restrictions in atmospheric circulation. Recent studies suggest that such conditions affected also some other paleoenvironmenta...

Upper Tithonian-lower berriasian carbonate sequence of the Getic Nappe System was studied near the locality Golubac using an integrated biostratigraphical methods based of calpionellid, calcareous and non-calcareous dinoflagellate cyst, nannofossil, foraminifer and palynomorph record. Calpionellids allowed to subdivide the section to standard calpi...

The historical stratotype for the Berriasian Stage (Cretaceous System) at Berrias (Ardeche, France) is here re-assessed. It shows a sedimentary record of early to late Berriasian age, part of the pelagic limestone succession of the western Vocontian Basin. We describe a studied section, circa 30 m in thickness, which yields calpionellids, calcareou...

Microfacies and high-resolution studies at the Silesian Unit (OuterWestern Carpathians, Czech Republic) on calpionellids, calcareous and non-calcareous dinoflagellate cysts, foraminifers and calcareous nannofossils, aligned with paleomagnetism, d13Ccarb and d18Ocarb, allow construction of a detailed stratigraphy and palaeoenvironmental interpretati...

Przedmiotem badań była pelagiczna sukcesja w basenie słoweńskim, obejmująca interwał stratygraficzny od tytonu dolnego do beriasu górnego o miąższości ok. 40 m (profil Petrovo Brdo). W najniższej części profilu (5 m) zaobserwowano ostrą granicę pomiędzy radiolarytami formacji tolminskiej a wapieniami kalpionellowymi formacji Maiolica. Zespoły kalpi...

The Jurassic/Cretaceous boundary interval (upper Tithonian – lower Berriasian) in the Transdanubian Mts (NW Hungary) was intensively studied throughout last decade (e.g. Fozy et al. 2022). The succession is typically developed in Ammonitico Rosso and Biancone facies, and is comprehensively dated using calpionellids, calcareous nannofossils, ammonit...

Foraminifera, ammonites, and calcareous dinoflagellates were used for stratigraphy and, together with microfacies, for the assessment of the palaeoenvironmental conditions of the Upper Jurassic deposits in the central Alborz Zone of northern Iran. The Lar Formation (Lar Fm.) in the Polur section is of latest Oxfordian to early Kimmeridgian age. The...

In January and May 2022 and June 2023, three unexpected caves (31m, 25 m, and 43 m long) were discovered during the construction of the D1 highway west of Hrboltová (a suburban part of the town of Ružomberok, the northern part of the Veľká Fatra Mountains). They formed in the lower Cretaceous bedded marly limestones of the Osnica Formation (approxi...

The Oxfordian-lower Tithonian rocks of the Etropole-Troyan region (Central Balkan Mts, Bulgaria) crop out into a long and narrow strip, in which they comprise three superpositioned lithostratigraphic units: Gintsi and Neshkovtsi formations, and the very base of the Cherni Osam Formation. The lower boundary of these sediments corresponds to a region...

The Pieniny Limestone Formation is a significant formation representing the pelagic sedimentation during the Late Jurassic to Early Cretaceous in numerous units of the Pieniny Klippen Belt. On the hills over Revišné, in the Orava sector of the Pieniny Klippen Belt, a distinctive klippe was sampled and biostratigraphically analysed in detail. The kl...

In several bio – and magnetostratigraphically well-calibrated sections studied, especially in the Carpathian-Alpine system (and some additional sections in the Tethyan Realm), a very slight carbon isotopic negative excursion just at the J/K boundary (sensu base of the Alpina Subzone within the Calpionella Zone) shows an almost identical trend.

The study of two selected profiles of the Upper Jurassic to Lower Cretaceous sequences of the Western Carpathians enabled a revision of the calpionellid zonation used so far for this area and it resulted in the proposal of a new division of the Crassicollaria Zone. Biozonation was based on research in detail on carbonate sediments of the Pieniny Kl...

Microfacies analysis and biostratigraphy of Jurassic-Cretaceous carbonate deposits of the Pieniny Klippen Belt of Western Carpathians from Milpoš locality The Jurassic-Cretaceous pelagic carbonate sediments of the Pieniny Klippen Belt around the Milpoš village were processed for microfacial analysis and biostratigraphy. The aim of the work was to s...

International chronostratigraphic chart showing division of geological time and its numerical ages is regularly updated by the International Commission on Stratigraphy (ICS). The Slovak chronostratigraphic chart has not been updated since the end of the 1980s. This paper provides an overview of standard procedures for deriving Slovak terms; introdu...

An integrated study of micro- and nannoplankton distribution, O and C isotopes and palaeomagnetic record of nine Carpathian sections provided a key interpretation tool to characterize the Jurassic–Cretaceous (J/K) boundary transition. Biostratigraphy supported by saccocomids, radiolarians, calpionellids, dinoflagellates and nannofossils helped to d...

Segmentation of the Guyanas continental margin of South America is inherited from the dual-phase Mesozoic rifting history controlling the first-order post-rift sedimentary architecture. The margin is divided into two segments by a transform marginal plateau (TMP), the Demerara Rise, into the Central and Equatorial Atlantic domains. This paper inves...

In part 1 of this work we discussed the possibilities for the selection of a GSSP for the Berriasian Stage of the Cretaceous System, based on prevailing practical methods for correlation in that J/K interval, traditional usage and the consensus over the best boundary markers that had developed in the last forty years. This consensus has developed f...

Abstract. In part 1 of this work we discussed the possibilities for the selection of a GSSP for the Berriasian Stage of the Cretaceous System, based on prevailing practical methods for correlation in that J/K interval, traditional usage and the consensus over the best boundary markers that had developed in the last forty years. This consensus has d...

Here we assess the evidence for the placing of magnetic and fossil biozonal boundaries in Upper Tithonian to lower Berriasian (Jurassic-Cretaceous boundary) sedimentary rocks on the Black Sea coast south of Theodosia (Ukraine): that is, in magnetozones M19n to M17r. We consider our earlier-published results from these sections in relation to the co...

Bąk et al. (2018) presented a model of global palaeoclimatic changes during the Bajocian–Oxfordian based on an analysis of millimetre-thick microlaminae in the radiolarian-bearing deposits of the Fatricum Domain exposed in the Filipka Valley in the Tatra Mountains, southern Poland. The authors claim that changes in microfacies and microfossil assem...

New sedimentological observations in the Lower Cretaceous of the Silesian Unit and integrated biostratigraphy based on calcareous nannofossils, dinoflagellate cysts, calpionellids and foraminifers have brought new insight to the stratigraphy of the Cieszyn section. The oldest exposed strata of the mudstone facies of the Cieszyn Limestone Formation...

Here in the first part of this publication we discuss the possibilities for the selection of a GSSP for the Berriasian Stage of the Cretaceous System, based on the established methods for correlation in the Tithonian/Berriasian interval. This will be followed, in the second part, by an account of the stratigraphic evidence that justifies the locali...

Detailed palaeontological, lithological and facies studies of a Mesozoic succession within the Lunz Nappe (Hödl-Kritsch section, Northern Calcareous Alps, Lower Austria) uncovered new details on the facies of the Upper Triassic to Lower Cretaceous. The outcrop is situated in an abandoned quarry within the easternmost Flössel Syncline (northern part...

Abstract: This work summarises the results of ten years of study of the palaeomagnetism and biostratigraphy of Tithonian–Berriasian profiles in the middle Vocontian Basin: at Le Chouet, Le Ravin de Font de Saint Bertrand, Charens, Belvedere (Haute Beaume) and Tré Maroua. This study has thus focussed on the “Calcaires Blancs vocontiens”, a predomina...

Mt Rudnica in eastern Slovenia structurally belongs to the Sava Folds. The mountain itself is an exposure of the Mesozoic core of the Rudnica Anticline. The major part of the core is composed of Triassic rocks deposited on the NE margin of the Dinaric (Adriatic) Carbonate Platform, overlain locally by deep-marine Berriasian Biancone limestone. The...

Since 2009 the Berriasian Working Group (ISCS, ICS) has been searching for the best sequence globally to represent the Tithonian/Berriasian (Jurassic/Cretaceous) boundary. To take this forward, it has made field assessments of more than sixty localities, documenting their sequences, fossil biotas and magnetostratigraphy. Only on such a sound factua...

The Moroccan Atlantic margin is a contemporary focus for oil and gas exploration owing to recent successes to the south in the Mauritania-Senegal-Gambia-Bissau-Conakry (MSGBC). Recent field studies (Luber et al. 2017, 2018) have successfully built a high resolution integrated stratigraphic framework for the late Barremian to early Albian interval o...

A high-resolution multidisciplinary study of two profiles in the Kotouč Quarry at Štramberk was carried out to define the age and palaeoenvironmental setting of the peri-reefal Štramberk Limestone. Calpionellids of the Alpina and Ferasini subzones of the standard Calpionella Zone confirm an early Berriasian age for both studied sequences. The prese...

A continuous sedimentary and stratigraphic record of Late Kimmeridgian – Early Berriasian age is presented from the pelagic succession from the eastern part of the Pieniny Klippen Belt (Velykyi Kamianets section, Ukraine). The studied section, 26-m-thick, was calibrated using biostratigraphy (calpionellids, calcareous dinocysts, calcareous nannofos...

Microfacies and high resolution studies at the Kurovice quarry (Czech Republic, Outer Western Carpathians) on calpionellids, calcareous and non-calcareous dinoflagellate cysts, sporomorphs and calcareous nannofossils, aligned with paleomagnetism, allow construction of a detailed stratigraphy and paleoenvironmental interpretation across the Jurassic...

Calpionella reveals a large diversity of the sizes and proportions of lorica, which can be documented within time, as well as in co-occurring assemblages. In the middle late Tithonian – Intermedia and Brevis subzones of the Crassicollaria Zone – the morphology of Calpionella is strongly diversified: small spherical (typical C. alpina), large (C. gr...

The Jurassic of the Alpine-Mediterranean Tethys was characterized by the formation of several interconnected basins, which underwent gradual deepening and oceanization. Sedimentation in each basin was influenced by a specific set of interrelated factors, such as tectonic activity, seawater circulation, climate, chemistry and trophic state of seawat...

Characteristic morphology and the assemblage composition of the ancient planktonic ciliate protozoan loricas make them a favourable tool for the interregional correlation and biostratigraphy of the Upper Jurassic–Lower Cretaceous sequences, especially, but not exclusively, in the areas lacking in ammonites.

Granica jura-kreda w profilu formacji wapienia cieszyńskiego w Cieszynie (Karpaty Zewnętrzne). Jurassic-Cretaceous boundary within the Cieszyn (Těšín) Lst. Fm in Cieszyn

The Protosilesian Basin, also known as the Severin-Moldavidic Basin, developed within the North European Platform as rift and/or back-arc basin during Late Jurassic times. It extended from Bohemian massif to Moesia. It was separated by the Silesian Ridge and its Bucovino-Getic equivalent from Jurassic Alpine Tethys. During Late Cretaceous times it...

We present evidence for the upper most Jurassic–lowest Cretaceous interval in Crimea, coastal southern Ukraine. Three facies zones are distinguished in the upper Dvuyakornaya and the Mayak formations of the eastern Crimean Peninsula: basinal, slope and toe-of-slope zones. In this interval we identify the lowest Berriasian Jacobi and Grandis subzone...

An unusual and very important macrofauna has been recorded in the deep water environment (i.e. below the aragonite CCD) of the uppermost Tithonian – lower Berriasian carbonate calpionellid-bearing sequence of the Kurovice section (Czechia). Rhyncholites, belemnites, and small vertebrate fauna of elasmobranchians (Neoselachii) are reported herein fr...

Calcareous nannofossil, calpionellid and ammonite occurrences have been directly constrained across the Jurassic–Cretaceous boundary interval in the section of Kopanitsa, SW Bulgaria. This section reveals a continuous and expanded sedimentary record through the Upper Tithonian and Lower Berriasian, besides an excellent calcareous nannofossil and am...

An integrated magneto- and biostratigraphic study of the Jurassic-Cretaceous (J-K) boundary section at Kurovice, Czech Republic was carried out. The acquired paleomagnetic data showed dual polarity characteristic remanent magnetization (ChRM) with counter-clockwise rotation direction. Rock magnetic data indicated magnetite as the principal carrier...

Palaeo- and rock-magnetic investigations of the St Bertrand’s Spring (Le Ravin de Font de St Bertrand) locality in France were carried out in order to contribute to, and improve, the stratigraphy of the Jurassic-Cretaceous boundary interval. Magnetic susceptibility shows slightly diamagnetic behaviour in the lowermost part of the profile and an inc...

Magnetostratigraphy, calpionellid and calcareous nannofossil biostratigraphy of the upper Tithonian and lower Berriasian of section Barlya in the West Balkan Mts are herein presented. The studied interval comprises the magnetozones from M21r to M17r, with a large interval of partial remagnetization. It has been directly correlated with a continuous...

In the eastern part of the Western Srednogorie Unit, around Dragovishtitsa Village, a specific succession of the Gintsi and Glozhene-Slivnitsa formations has provided micropalaeontological evidence for late Tithonian (Chitinoidella, Praetintinnopsella and the base of Crassicollaria zones) and mid-Berriasian (the Elliptica Subzone of the Calpionella...

The integration of calpionellid biostratigraphy, microfacies analysis, U–Pb geochronology, and strontium chemostratigraphy improves the definition of the Berriasian–Valanginian boundary in the Tlatlauquitepec area and validates the age of calpionellid zones from eastern Mexico in this interval. An age of 139.85 Ma derived from ⁸⁷Sr/⁸⁶Sr ratio withi...

Carbon isotope chemostratigraphy and calpionellid biostratigraphy were used in this study to improve the stratigraphic resolution of the Upper Jurassic–Lower Cretaceous Rayda Formation and examine the expression of the Valanginian C-isotope event in the SE-Tethys. This integrated stratigraphic framework allows for a better correlation between south...

In the eastern part of the Western Srednogorie Unit, a specific succession of Gintsi and Glozhene–Slivnitsa formations has provided micropalaeontologi-cal evidence of late Tithonian (Chitinoidella and Praetintinnopsella zones) and mid-Berriasian (Elliptica Subzone of the Calpionella Zone) age on the basis of 38 chitinoidellid and calpionellid speci...

Remnants of a Mesozoic continental margin can be studied today in the nappe pile of the Oman Mountains. Successions of the Arabian carbonate platform and the adjacent deep Hawasina Basin are preserved in the nappe pile and in the foothills of this Mountain range. The Jurassic–Cretaceous sediment successions of the Hawasina Basin (Sumeini and Hamrat...

The article provides the review of the most important geotouristic attraction within the Cieszyn Foothills, Outer Flysch Carpathians in Poland and adjacent part of Czech Republic. The best geosites, which can be visited during short 1-2 days visit in the Polish Carpathians, were selected. The present paper contains the description of the classic lo...

A well preserved Upper Tithonian–Lower Berriasian Strapkova sequence of hemipelagic limestones improves our understanding of environmental changes occurring at the Jurassic/Cretaceous boundary in the Western Carpathians. Three dinoflagellate and four calpionellid zones have been recognized in the section. The onset of the Alpina Subzone of the stan...

The article provides a review of the most important geotouristic attractions within the Cieszyn Foothills, Outer Flysch Carpathians in Poland and adjacent part of the Czech Republic. The best geosites, which can be visited during a short 1-2 day visit in the Polish Carpathians were selected. The present paper contains the description of the classic...

The present contribution deals with the taxonomy of seven species of perisphinctoid ammonite from the Štramberk Limestone (Outer Western Carpathians, Czech Republic) deposited in Moravian-Silesian museums. The age of these studied ammonites is compared with that of index microfossils contained in the matrix adhering to or infilling the studied spec...

An integrated biostratigraphic investigation has been performed of section Z of the Río Argos successions. Section Z is situated along the Barranco de Tollo, a left tributary of the Río Argos three kilometres west of the city of Caravaca, Province of Murcia, SE Spain. The sediments of section Z form part of the External Subbetic Zone of the Betic C...

ABSTRACT Ammonites, nannofossils and calpionellids have been studied from Chia Gara Formation at Banik village (Zakho area, Duhok Governorate, Kurdistan). New micropalaeontological work at Banik makes it possible for the first time to identify useful western Tethyan Jurassic /Cretaceous boundary marker species (calpionellids and nannofossils) and t...

Ammonites, nannofossils and calpionellids have been studied from Chia Gara Formation at Banik village (Zakho area, Dohuk Governorate, Kurdistan). New micropalaeontological work at Banik makes it possible for the first time to identify useful western Tethyan Jurassic /Cretaceous boundary marker species (calpionellids and nannofossils) and to make pr...

The article provides the review of the most important and significant geotouristic attraction within the Cieszyn Foothills, Outer Flysch Carpathians in Poland and adjacent part of Czech Republic. The best (based on educational value, exposure and accessibility according to the subjective opinion of authors) geological outcrops and geotouristic site...