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Jasenka Sremac
Faculty of Science, University of Zagreb, Zagreb, Croatia

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Preprint content
Published: 04 March 2021
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The most numerous and diversified Middle Miocene gastropod collection from Northern Croatia, housed at the Croatian Natural History Museum (CNHM), comes from the Zaprešić Brijeg locality near Zagreb. The gastropod-bearing horizon of the Middle Miocene (Langhian, Badenian) age is today no longer visible on the surface, not only in this area but also in other parts of Northern Croatia. The description of the Zaprešić Brijeg locality and fossil collecting methods can be found in the museum archives and published papers. According to these data, gastropods were collected from "sandstones" during the first half of the 20th century (Gorjanović-Kramberger 1894; Šuklje 1929). Among more than 11000 stored gastropod shells from this locality 45 belong to marine, 2 to marine/brackish and 2 to brackish gastropod families. Some families comprise only one or a few representatives, while other are much more common, such as Potamididae (4459 shells), Nassariidae (2428 shells), Clavatulidae (1813 shells), Turritellidae (1253 shells), and Cerithiidae (508 shells). In previously published papers on the Zaprešić Brijeg gastropod fauna (e.g., Gorjanović-Kramberger 1894; Šuklje 1929; Pavlovsky 1957, 1960) the focus was mostly on the taxonomical aspect. While examining the collection, we observed numerous drilling predation marks in a shape of drill holes on marine gastropod shells and provided numerical analysis of predation marks on some common families (Bošnjak et al., submitted). The aim of this study is to continue the division of gastropod families by their palaeoecology (infauna, epifauna) and feeding type (carnivores, suspension feeders, detritivores and grazers), in order to better understand the palaeoenvironmental conditions during the Middle Miocene (Badenian, Langhian) in this area. Non-marine gastropod taxa indicate the freshwater influx and the vicinity of hinterland. Such a rich museum collection can provide further insight into the palaeoecology of the southwestern margin of the Central Paratethys, even though the original fossiliferous horizon is no more available in the field.

References:

Bošnjak, M., Sremac, J., Karaica, B., Mađerić, I. & Jarić, A. (submitted): Mollusk mortal kombat: drilled Middle Miocene gastropods from the south-western margin of the Central Paratethys, Croatia.

Gorjanović-Kramberger, D. (1894): Geology of Samoborsko gorje Mt. and Žumberak Mt. Rad Yugoslav Academy of Sciences and Arts, 120, 1–82. (in Croatian)

Šuklje, F. (1929): Die Mediterranfauna des Zaprešić Brijeg in der Samoborska gora in Kroatien. Bulletin de l'institut geologique de Zagreb, III, 1–52. (in Croatian with German summary)

Pavlovsky, M. (1957): Ein Beitrag zur Kenntnis Miozäner Gastropoden von Zaprešić-Brijeg bei Samobor. Geološki vjesnik, 10 (1956), 51–56. (in Croatian with German summary)

Pavlovsky, M. (1960): Neue Elemente der Fauna von Zaprešić-Brijeg bei Samobor. Geološki vjesnik, XIII (1959), 213–216. (in Croatian with German summary)

ACS Style

Marija Bošnjak; Jasenka Sremac. Middle Miocene gastropods from the southwestern margin of the Central Paratethys, Croatia: Museum collection's insight. 2021, 1 .

AMA Style

Marija Bošnjak, Jasenka Sremac. Middle Miocene gastropods from the southwestern margin of the Central Paratethys, Croatia: Museum collection's insight. . 2021; ():1.

Chicago/Turabian Style

Marija Bošnjak; Jasenka Sremac. 2021. "Middle Miocene gastropods from the southwestern margin of the Central Paratethys, Croatia: Museum collection's insight." , no. : 1.

Original paper
Published: 23 July 2020 in Arabian Journal of Geosciences
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Geological probability calculation was applied to the Northern Croatian Neogene deposits in the western Sava Depression. Structures “A” and “B” (with sandstone hydrocarbon reservoirs inside the Kloštar Ivanić Formation, Upper Miocene) were analyzed using two different Probability of Success (POS) methodologies. The classical POS approach showed that, in such play and wider areas of selected two structures, the probability for discovering the new HC reservoirs is 42.18%. This is valid for minimum of 500,000 m3 of geological reserves. The modified POS approach has been used for calculation of waterflooding efficiency in selected structures “A” and “B.” The probability value of 56.25% indicates that future flooding would result in increased recovery.

ACS Style

Josip Ivšinović; Tomislav Malvić; Josipa Velić; Jasenka Sremac. Geological Probability of Success (POS), case study in the Late Miocene structures of the western part of the Sava Depression, Croatia. Arabian Journal of Geosciences 2020, 13, 1 -12.

AMA Style

Josip Ivšinović, Tomislav Malvić, Josipa Velić, Jasenka Sremac. Geological Probability of Success (POS), case study in the Late Miocene structures of the western part of the Sava Depression, Croatia. Arabian Journal of Geosciences. 2020; 13 (15):1-12.

Chicago/Turabian Style

Josip Ivšinović; Tomislav Malvić; Josipa Velić; Jasenka Sremac. 2020. "Geological Probability of Success (POS), case study in the Late Miocene structures of the western part of the Sava Depression, Croatia." Arabian Journal of Geosciences 13, no. 15: 1-12.

Journal article
Published: 29 June 2020 in Processes
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The basic principles of geological risk calculation through probability of success (PoS) are mostly applied to numerical estimation of additional hydrocarbon existence in proven reservoirs or potential hydrocarbon discoveries in selected geological regional subsurface volumes. It can be adapted and validated for a comprehensive input dataset collected in the selected petroleum province, by dividing up geological events into several probability categories and classes. Such methodology has been widely developed in the last decades in the Croatian subsurface—mostly in the Croatian Pannonian Basin System (CPBS). Through the adaptation of geological categories, it was also applied in hybrid, i.e., stochastic, models developed in the CPBS (Drava Depression), mostly for inclusion of porosity values. As the robustness of this methodology is very high, it was also modified to estimate the influence of water-flooding in increasing oil recovery in some proven Neogene sandstone reservoirs in the CPBS (Sava Depression). This new modification is presented to be applied to geological risk calculation, intending to assess the safety of geological environment storage in deep wells, where spent nuclear fuel (SPN) would be disposed, a subject of great importance. The conceptual study encompassed the magmatic and metamorphic rocks in the pre-Neogene basement of the CPBS, intended to be used for such purpose. Regionally distributed lithologies are considered for nuclear waste disposal purpose, in order to detect the safest ones, considering petrophysical values, water saturation, recent weathering and tectonic activity.

ACS Style

Tomislav Malvić; Maria Alzira Pimenta Dinis; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Marija Bošnjak; Uroš Barudžija; Želimir Veinović; Hélder Fernando Pedrosa E Sousa. Geological Risk Calculation through Probability of Success (PoS), Applied to Radioactive Waste Disposal in Deep Wells: A Conceptual Study in the Pre-Neogene Basement in the Northern Croatia. Processes 2020, 8, 755 .

AMA Style

Tomislav Malvić, Maria Alzira Pimenta Dinis, Josipa Velić, Jasenka Sremac, Josip Ivšinović, Marija Bošnjak, Uroš Barudžija, Želimir Veinović, Hélder Fernando Pedrosa E Sousa. Geological Risk Calculation through Probability of Success (PoS), Applied to Radioactive Waste Disposal in Deep Wells: A Conceptual Study in the Pre-Neogene Basement in the Northern Croatia. Processes. 2020; 8 (7):755.

Chicago/Turabian Style

Tomislav Malvić; Maria Alzira Pimenta Dinis; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Marija Bošnjak; Uroš Barudžija; Želimir Veinović; Hélder Fernando Pedrosa E Sousa. 2020. "Geological Risk Calculation through Probability of Success (PoS), Applied to Radioactive Waste Disposal in Deep Wells: A Conceptual Study in the Pre-Neogene Basement in the Northern Croatia." Processes 8, no. 7: 755.

Journal article
Published: 15 May 2020 in Geosciences
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Geomathematics is extremely important in geosciences, particularly in the geology. The key for any geomathematical analysis is the definition of a typical model to be applied for further prognosis, either through deterministic or stochastic approaches. The selection of the appropriate procedure is presented in this paper. Two different geomathematical subfield datasets were used in subsurface geological mapping and palaeontology and different biostatistics applications, representing important geomathematical subfields in the Croatian geology. The different subsurface interpolation methods tested, validated and recommended for application were used to obtain the best possible outcome in reservoir modelling, in the cases with small datasets. Cross-validation may be chosen as the main selection criteria, applied to the Croatian part of the Pannonian Basin System (CPBS). Recent advances in biostatistics applied in palaeontology and case studies from Croatia are also presented, where biometric studies are of significant importance in fossil biota. Data, methods and problems in geosciences are vast subjects, and address a wide spectrum of fundamental science. Because geology includes subsurface and surface geology, and very different datasets regarding variable and number of data, we have chosen here two representative case study groups with original samples from Northern Croatia. Subsurface mapping has been presented on limited petrophysical datasets from the Northern Croatian, Miocene, hydrocarbon reservoirs. Biostatistics have been presented on very different samples, allowing us to achieve paleoenvironmental reconstructions of the size of relevant fossils, such as dinosaurs or other species and their paleoenvironments. All examples highlight examples of the valuable application of geomathematical tools in geology. The results, cautiously validated and correlated with other, non-numerical (indicator, categorical) geological knowledge, are of enormous assistance in creating better geological models.

ACS Style

Tomislav Malvić; Marija Bošnjak; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Maria Alzira Pimenta Dinis; Uroš Barudžija. Recent Advances in Geomathematics in Croatia: Examples from Subsurface Geological Mapping and Biostatistics. Geosciences 2020, 10, 188 .

AMA Style

Tomislav Malvić, Marija Bošnjak, Josipa Velić, Jasenka Sremac, Josip Ivšinović, Maria Alzira Pimenta Dinis, Uroš Barudžija. Recent Advances in Geomathematics in Croatia: Examples from Subsurface Geological Mapping and Biostatistics. Geosciences. 2020; 10 (5):188.

Chicago/Turabian Style

Tomislav Malvić; Marija Bošnjak; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Maria Alzira Pimenta Dinis; Uroš Barudžija. 2020. "Recent Advances in Geomathematics in Croatia: Examples from Subsurface Geological Mapping and Biostatistics." Geosciences 10, no. 5: 188.

Journal article
Published: 21 January 2020 in Sustainability
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The authors analyse the process of water re-injection in the hydrocarbon reservoirs/fields in the Upper Miocene sandstone reservoirs, located in the western part of the Sava Depression (Croatia). Namely, this is the “A” field with “L” reservoir that currently produces hydrocarbons using a secondary recovery method, i.e., water injection (in fact, re-injection of the field waters). Three regional reservoir variables were analysed: Porosity, permeability and injected water volumes. The quantity of data was small for porosity reservoir “L” and included 25 points; for permeability and injected volumes of water, 10 points each were measured. This study defined selection of mapping algorithms among methods designed for small datasets (fewer than 20 points). Namely, those are inverse distance weighting and nearest and natural neighbourhood. Results were tested using cross-validation and isoline shape recognition, and the inverse distance weighting method is described as the most appropriate approach for mapping permeability and injected volumes in reservoir “L”. Obtained maps made possible the application of the modified geological probability calculation as a tool for prediction of success for future injection (with probability of 0.56). Consequently, it was possible to plan future injection more efficiently, with smaller injected volumes and higher hydrocarbon recovery. Prevention of useless injection, decreasing number of injection wells, saving energy and funds invested in such processes lead to lower environmental impact during the hydrocarbon production.

ACS Style

Tomislav Malvić; Josip Ivšinović; Josipa Velić; Jasenka Sremac; Uroš Barudžija. Increasing Efficiency of Field Water Re-Injection during Water-Flooding in Mature Hydrocarbon Reservoirs: A Case Study from the Sava Depression, Northern Croatia. Sustainability 2020, 12, 786 .

AMA Style

Tomislav Malvić, Josip Ivšinović, Josipa Velić, Jasenka Sremac, Uroš Barudžija. Increasing Efficiency of Field Water Re-Injection during Water-Flooding in Mature Hydrocarbon Reservoirs: A Case Study from the Sava Depression, Northern Croatia. Sustainability. 2020; 12 (3):786.

Chicago/Turabian Style

Tomislav Malvić; Josip Ivšinović; Josipa Velić; Jasenka Sremac; Uroš Barudžija. 2020. "Increasing Efficiency of Field Water Re-Injection during Water-Flooding in Mature Hydrocarbon Reservoirs: A Case Study from the Sava Depression, Northern Croatia." Sustainability 12, no. 3: 786.

Journal article
Published: 04 December 2018 in Geosciences
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Upper Cretaceous deposits in Medvednica Mt. are composed of coarse-grained conglomerates, sandstones, shales and the pelagic Scaglia Limestones. Such deposits in the wider region possess reservoir potential, not previously studied in Northern Croatia. Modal composition of conglomerates, size and distribution of clasts, porosity and permeability were studied from one new exposure in Medvednica Mt., and the results were compared with previously published data from neighboring successions. Conglomerates are polymictic, clast- to matrix-supported, with clasts and matrix entirely composed of local bedrocks. Porosity varies between 4.98 to 10.89% and permeability from 1.13 to 43.3 mD. Overlying pelagic Scaglia Limestones contain pelagic foraminifera of the latest Santonian to Early Campanian age (83 to 85 Ma). Clasts were eroded from the local hinterland, probably transported to the beach by short-term torrents and deposited along the shelves of the proto-Medvednica Island. Previously presumed alluvial transport is not likely. Deposition took place in a Gosau-type basin during the subsidence phase, additionally controlled by a third-order sea-level change at the Santonian-Campanian boundary. According to this study, Upper Cretaceous clastites possess possible reservoir potential, and deserve more attention in future hydrocarbon research in Croatia.

ACS Style

Jasenka Sremac; Josipa Velić; Marija Bošnjak; Ivo Velić; Davor Kudrnovski; Tamara Troskot-Čorbić. Depositional Model, Pebble Provenance and Possible Reservoir Potential of Cretaceous Conglomerates: Example from the Southern Slope of Medvednica Mt. (Northern Croatia). Geosciences 2018, 8, 456 .

AMA Style

Jasenka Sremac, Josipa Velić, Marija Bošnjak, Ivo Velić, Davor Kudrnovski, Tamara Troskot-Čorbić. Depositional Model, Pebble Provenance and Possible Reservoir Potential of Cretaceous Conglomerates: Example from the Southern Slope of Medvednica Mt. (Northern Croatia). Geosciences. 2018; 8 (12):456.

Chicago/Turabian Style

Jasenka Sremac; Josipa Velić; Marija Bošnjak; Ivo Velić; Davor Kudrnovski; Tamara Troskot-Čorbić. 2018. "Depositional Model, Pebble Provenance and Possible Reservoir Potential of Cretaceous Conglomerates: Example from the Southern Slope of Medvednica Mt. (Northern Croatia)." Geosciences 8, no. 12: 456.

Journal article
Published: 07 September 2018 in Rudarsko-geološko-naftni zbornik
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Fossiliferous Middle Miocene deposits from the surroundings of Marija Bistrica (north-east of Zagreb) transgressively overly older pre-Cenozoic bedrocks. Fossils from shallow marine environments are in most cases preserved as bioclasts,...

ACS Style

Jasenka Sremac; Kristina Tripalo; Marko Repac; Marija Bošnjak; Davor Vrsaljko; Tihomir Marjanac; Alan Moro; Borna Lužar-Oberiter; Karmen Fio Firi; Šimun Aščić. MIDDLE MIOCENE DROWNED RAMP IN THE VICINITY OF MARIJA BISTRICA (NORTHERN CROATIA). Rudarsko-geološko-naftni zbornik 2018, 33, 23 -43.

AMA Style

Jasenka Sremac, Kristina Tripalo, Marko Repac, Marija Bošnjak, Davor Vrsaljko, Tihomir Marjanac, Alan Moro, Borna Lužar-Oberiter, Karmen Fio Firi, Šimun Aščić. MIDDLE MIOCENE DROWNED RAMP IN THE VICINITY OF MARIJA BISTRICA (NORTHERN CROATIA). Rudarsko-geološko-naftni zbornik. 2018; 33 (4):23-43.

Chicago/Turabian Style

Jasenka Sremac; Kristina Tripalo; Marko Repac; Marija Bošnjak; Davor Vrsaljko; Tihomir Marjanac; Alan Moro; Borna Lužar-Oberiter; Karmen Fio Firi; Šimun Aščić. 2018. "MIDDLE MIOCENE DROWNED RAMP IN THE VICINITY OF MARIJA BISTRICA (NORTHERN CROATIA)." Rudarsko-geološko-naftni zbornik 33, no. 4: 23-43.

Journal article
Published: 01 August 2017 in Geologica Carpathica
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Deep marine Miocene deposits exposed sporadically in the Medvednica Mt. (northern Croatia) comprise pelagic organisms such as coccolithophores, planktic foraminifera and pteropods. The pteropod fauna from yellow marls at the Vejalnica locality (central part of Medvednica Mt.) encompasses abundant specimens ofVaginella austriacaKittl, 1886, accompanied with scarceClio fallauxi(Kittl, 1886). Calcareous nannoplankton points to the presence of NN5 nannozone at this locality. Highly fossiliferous grey marls at the Marija Bistrica locality (north-eastern area of Medvednica Mt.) comprise limacinid pteropods:Limacina valvatina(Reuss, 1867),L. gramensis(Rasmussen, 1968) andLimacinasp. Late Badenian (NN5 to NN6 nannozone) age of these marls is presumed on the basis of coccolithophores. Most of the determined pteropods on species level, exceptV. austriacahave been found and described from this region for the first time. New pteropod records from Croatia point to two pteropod horizons coinciding with the Badenian marine transgressions in Central Paratethys. These pteropod assemblages confirm the existence of W–E marine connection (“Transtethyan Trench Corridor”) during the Badenian NN5 nannozone. Limacinids point to the possible immigration of the “North Sea fauna” through a northern European marine passage during the Late Badenian (end of NN5-beginning of NN6 zone), as previously presumed by some other authors.

ACS Style

Marija Bošnjak; Jasenka Sremac; Davor Vrsaljko; Šimun Aščić; Luka Bosak. The Miocene “Pteropod event” in the SW part of the Central Paratethys (Medvednica Mt., northern Croatia). Geologica Carpathica 2017, 68, 329 -349.

AMA Style

Marija Bošnjak, Jasenka Sremac, Davor Vrsaljko, Šimun Aščić, Luka Bosak. The Miocene “Pteropod event” in the SW part of the Central Paratethys (Medvednica Mt., northern Croatia). Geologica Carpathica. 2017; 68 (4):329-349.

Chicago/Turabian Style

Marija Bošnjak; Jasenka Sremac; Davor Vrsaljko; Šimun Aščić; Luka Bosak. 2017. "The Miocene “Pteropod event” in the SW part of the Central Paratethys (Medvednica Mt., northern Croatia)." Geologica Carpathica 68, no. 4: 329-349.

Journal article
Published: 01 June 2017 in Cretaceous Research
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ACS Style

Karmen Fio Firi; Antoine Bercovici; Olena Shevchuk; Jasenka Sremac. Late Cretaceous palynoflora from the central part of the Adriatic Carbonate Platform (Islands of Hvar and Šćedro), southern Croatia. Cretaceous Research 2017, 74, 142 -150.

AMA Style

Karmen Fio Firi, Antoine Bercovici, Olena Shevchuk, Jasenka Sremac. Late Cretaceous palynoflora from the central part of the Adriatic Carbonate Platform (Islands of Hvar and Šćedro), southern Croatia. Cretaceous Research. 2017; 74 ():142-150.

Chicago/Turabian Style

Karmen Fio Firi; Antoine Bercovici; Olena Shevchuk; Jasenka Sremac. 2017. "Late Cretaceous palynoflora from the central part of the Adriatic Carbonate Platform (Islands of Hvar and Šćedro), southern Croatia." Cretaceous Research 74, no. : 142-150.

Journal article
Published: 01 August 2016 in Geologica Carpathica
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During the Middle Miocene, the northern Croatian Medvednica Mt. was an island within the Pannonian Basin System, situated on the SW margin of the Central Paratethys Sea. Miocene sedimentary rocks (the Late Badenian Bulimina–Bolivina Zone and Ammonia beccarii ecozone), from the SW slopes of Medvednica Mt. clearly reflect a transgressive-regressive cycle with emersion during the Badenian/Sarmatian boundary. After the initial phase of transgression, the pioneer Elphidium–Asterigerinata–Ammonia benthic foraminiferal assemblage is present in bioclastic limestones, such as those at the Borovnjak locality. This marginal marine assemblage from a highly energetic, normally saline environment is characterized by poor preservation of foraminiferal tests, low diversity and strong domination. Advanced transgression is followed by establishment of the Elphidium–Asterigerinata assemblage, which is found in biocalcsiltites from the laterally deeper and more sheltered environment at Gornje Vrapče. This diverse assemblage is typical for inner/middle shelf environment with sufficient oxygen content. A general shallowing upward trend can be recognized at both localities, followed by visible interchange of different sedimentological and biotic features. Successive and oscillatory regression in the marginal marine environment was followed by salinity fluctuations and final brackish conditions with Ammonia–Elphidium assemblage. The laterally deeper environment reacted to regressive trends on finer scale with almost regular changes of benthic foraminiferal assemblages in the laminae (Heterolepa–Bolivina assemblage/Bolivina–Cassidulina assemblage/Elphidium–Asterigerinata assemblage). It might reflect sea-level oscillations with periodically increased siliciclastic and nutrient input from land or influence of seasonality on benthic assemblages, which occurred in the advanced phase of the regression near the Badenian/Sarmatian boundary.

ACS Style

Đurðica Pezelj; Jasenka Sremac; Vladimir Bermanec. Shallow-water benthic foraminiferal assemblages and their response to the palaeoenvironmental changes — example from the Middle Miocene of Medvednica Mt. (Croatia, Central Paratethys). Geologica Carpathica 2016, 67, 329 -345.

AMA Style

Đurðica Pezelj, Jasenka Sremac, Vladimir Bermanec. Shallow-water benthic foraminiferal assemblages and their response to the palaeoenvironmental changes — example from the Middle Miocene of Medvednica Mt. (Croatia, Central Paratethys). Geologica Carpathica. 2016; 67 (4):329-345.

Chicago/Turabian Style

Đurðica Pezelj; Jasenka Sremac; Vladimir Bermanec. 2016. "Shallow-water benthic foraminiferal assemblages and their response to the palaeoenvironmental changes — example from the Middle Miocene of Medvednica Mt. (Croatia, Central Paratethys)." Geologica Carpathica 67, no. 4: 329-345.

Journal article
Published: 01 July 2016 in Palaeogeography, Palaeoclimatology, Palaeoecology
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ACS Style

Jasenka Sremac; Bogdan Jurkovšek; Dunja Aljinović; Tea Kolar-Jurkovšek. Equatorial Palaeotethys as the last sanctuary for late Permian metazoan reef-builders: New evidence from the Bellerophon Formation of Slovenia. Palaeogeography, Palaeoclimatology, Palaeoecology 2016, 454, 91 -100.

AMA Style

Jasenka Sremac, Bogdan Jurkovšek, Dunja Aljinović, Tea Kolar-Jurkovšek. Equatorial Palaeotethys as the last sanctuary for late Permian metazoan reef-builders: New evidence from the Bellerophon Formation of Slovenia. Palaeogeography, Palaeoclimatology, Palaeoecology. 2016; 454 ():91-100.

Chicago/Turabian Style

Jasenka Sremac; Bogdan Jurkovšek; Dunja Aljinović; Tea Kolar-Jurkovšek. 2016. "Equatorial Palaeotethys as the last sanctuary for late Permian metazoan reef-builders: New evidence from the Bellerophon Formation of Slovenia." Palaeogeography, Palaeoclimatology, Palaeoecology 454, no. : 91-100.

Journal article
Published: 30 June 2016 in Geologia Croatica
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ACS Style

Mirko Japundžić; Jasenka Sremac. Palaeobiogeography of the Late Carboniferous brachiopoda from Velebit Mt. (Croatia). Geologia Croatica 2016, 69, 177 -185.

AMA Style

Mirko Japundžić, Jasenka Sremac. Palaeobiogeography of the Late Carboniferous brachiopoda from Velebit Mt. (Croatia). Geologia Croatica. 2016; 69 (2):177-185.

Chicago/Turabian Style

Mirko Japundžić; Jasenka Sremac. 2016. "Palaeobiogeography of the Late Carboniferous brachiopoda from Velebit Mt. (Croatia)." Geologia Croatica 69, no. 2: 177-185.

Journal article
Published: 30 June 2016 in Geologia Croatica
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Middle Miocene deposits at the Dubravica locality in SW Medvednica Mt. (N Croatia) contain various marine fossils, including one tooth of the surgeonfish (Acanthuridae). This is the first such record in Croatia and the second in the wider region, besides the Vienna Basin. The appearance of surgeonfishes in the Paratethys coincides with the Miocene thermal maximum. Their distribution was probably controlled by available reef habitat and their palaeobiogeography and migration routes are yet to be studied.

ACS Style

Kristina Tripalo; Sanja Japundžić; Jasenka Sremac; Marija Bošnjak. First record of Acanthuridae (surgeonfish) from the Miocene deposits of the Medvednica Mt. Geologia Croatica 2016, 69, 201 -204.

AMA Style

Kristina Tripalo, Sanja Japundžić, Jasenka Sremac, Marija Bošnjak. First record of Acanthuridae (surgeonfish) from the Miocene deposits of the Medvednica Mt. Geologia Croatica. 2016; 69 (2):201-204.

Chicago/Turabian Style

Kristina Tripalo; Sanja Japundžić; Jasenka Sremac; Marija Bošnjak. 2016. "First record of Acanthuridae (surgeonfish) from the Miocene deposits of the Medvednica Mt." Geologia Croatica 69, no. 2: 201-204.

Journal article
Published: 30 June 2016 in Geologia Croatica
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100th Birth Anniversary of Professor Vanda Kochansky-Devidé

ACS Style

Jasenka Sremac; Lidija Galovic. 100th Birth Anniversary of Professor Vanda Kochansky-Devidé. Geologia Croatica 2016, 69, 175 -175.

AMA Style

Jasenka Sremac, Lidija Galovic. 100th Birth Anniversary of Professor Vanda Kochansky-Devidé. Geologia Croatica. 2016; 69 (2):175-175.

Chicago/Turabian Style

Jasenka Sremac; Lidija Galovic. 2016. "100th Birth Anniversary of Professor Vanda Kochansky-Devidé." Geologia Croatica 69, no. 2: 175-175.

Journal article
Published: 26 April 2016 in Facies
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At six localities in northern Croatia (Donje Orešje, Gornje Orešje), Slovenia (Stranice, Slovenj Gradec), and Bosnia (Bešpelj and Kober), successions of shallow-water Campanian deposits transgressively covered a tectonically uplifted and eroded paleorelief. They constitute different lateral parts of a transgressive subtidal environment, where rudists and corals are typical macrofossils. At the investigated localities, two types of succession were distinguished: (a) clastic and (b) carbonate. Most localities are within the extended chronostratigraphic range of Calveziconus cf. lecalvezae (80.5–79.03 Ma), which comprises the upper part of the Vaccinites alpinus interval zone (for Stranice and Slovenj Gradec localities) and beginning of the Pironaea polystyla interval zone (for Bešpelj and Kober localities). In clastic successions, corals are the most abundant macrofossils, whereas rudists predominate within carbonate sections. The depositional setting of the investigated localities results from rapid relative sea-level rise with a tectonic overprint, which covered different types of paleorelief. In cases when the paleorelief is gentle, a transgressive succession starts with clastic coral-rich sediments or carbonates with radiolitids. In areas of steeper paleorelief carbonate sediments were deposited with a mixed radiolitid-hippuritid community, and the rudists, as the major macrofossils, indicate higher sedimentation rates in comparison with the clastic situations.

ACS Style

Alan Moro; Aleksander Horvat; Vladimir Tomić; Jasenka Sremac; Vladimir Bermanec. Facies development and paleoecology of rudists and corals: an example of Campanian transgressive sediments from northern Croatia, northeastern Slovenia, and northwestern Bosnia. Facies 2016, 62, 1 .

AMA Style

Alan Moro, Aleksander Horvat, Vladimir Tomić, Jasenka Sremac, Vladimir Bermanec. Facies development and paleoecology of rudists and corals: an example of Campanian transgressive sediments from northern Croatia, northeastern Slovenia, and northwestern Bosnia. Facies. 2016; 62 (3):1.

Chicago/Turabian Style

Alan Moro; Aleksander Horvat; Vladimir Tomić; Jasenka Sremac; Vladimir Bermanec. 2016. "Facies development and paleoecology of rudists and corals: an example of Campanian transgressive sediments from northern Croatia, northeastern Slovenia, and northwestern Bosnia." Facies 62, no. 3: 1.

Journal article
Published: 01 January 2016 in Rudarsko-geološko-naftni zbornik
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During the early stages of the Middle Miocene transgression marine biota invaded the newly formed Paratethys Sea. Reefs and reef-like structures particularly flourished with life, supported by the favourable climate conditions. Miocene biogene buildups show a variety of fossil assemblages and lithologic features. The main reef-builders were bryozoans, coralline algae, corals, oysters, vermetids, sponges and serpulids. Water turbidity and depth were major ecological factors controlling the reef biota. Lithofacies types at the studied localities in Northern Croatia show significant similarity with the Upper Langhian (Middle Badenian) of the Leitha Mountains in Austria, but can also be well compared with Miocene to recent reef structures in the Mediterranean. The Miocene reef-like buildups exhibit different porosity rates and other lithological characteristics.

ACS Style

Jasenka Sremac; Marija Bošnjak Makovec; Davor Vrsaljko; Bojan Karaica; Kristina Tripalo; Karmen Fio Firi; Ana Majstorović Bušić; Tihomir Marjanac; Demetrova 1 Croatian Natural History Museum; Hr-10000 Zagreb Hanamanova 1C; Hr-10000 Zagreb Šestinski Vrh 43A; Šubićeva 29 Ina-Industry Of Oil Plc.. REEFS AND BIOACCUMULATIONS IN THE MIOCENE DEPOSITS OF THE NORTH CROATIAN BASIN – AMAZING DIVERSITY YET TO BE DESCRIBED. Rudarsko-geološko-naftni zbornik 2016, 31, 19 -29.

AMA Style

Jasenka Sremac, Marija Bošnjak Makovec, Davor Vrsaljko, Bojan Karaica, Kristina Tripalo, Karmen Fio Firi, Ana Majstorović Bušić, Tihomir Marjanac, Demetrova 1 Croatian Natural History Museum, Hr-10000 Zagreb Hanamanova 1C, Hr-10000 Zagreb Šestinski Vrh 43A, Šubićeva 29 Ina-Industry Of Oil Plc.. REEFS AND BIOACCUMULATIONS IN THE MIOCENE DEPOSITS OF THE NORTH CROATIAN BASIN – AMAZING DIVERSITY YET TO BE DESCRIBED. Rudarsko-geološko-naftni zbornik. 2016; 31 (1):19-29.

Chicago/Turabian Style

Jasenka Sremac; Marija Bošnjak Makovec; Davor Vrsaljko; Bojan Karaica; Kristina Tripalo; Karmen Fio Firi; Ana Majstorović Bušić; Tihomir Marjanac; Demetrova 1 Croatian Natural History Museum; Hr-10000 Zagreb Hanamanova 1C; Hr-10000 Zagreb Šestinski Vrh 43A; Šubićeva 29 Ina-Industry Of Oil Plc.. 2016. "REEFS AND BIOACCUMULATIONS IN THE MIOCENE DEPOSITS OF THE NORTH CROATIAN BASIN – AMAZING DIVERSITY YET TO BE DESCRIBED." Rudarsko-geološko-naftni zbornik 31, no. 1: 19-29.

Journal article
Published: 30 September 2015 in Bulletin of Geosciences
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Website of the journal Bulletin of Geosciences, published since 1925 by the Czech Geological Survey

ACS Style

Christopher Cleal; Y.G. Tenchov; Jasenka Sremac; T. Đerek; J Japundžić. Pennsylvanian fossil flora from the Velebit Mountains and Lika region (SW Croatia). Bulletin of Geosciences 2015, 721 -742.

AMA Style

Christopher Cleal, Y.G. Tenchov, Jasenka Sremac, T. Đerek, J Japundžić. Pennsylvanian fossil flora from the Velebit Mountains and Lika region (SW Croatia). Bulletin of Geosciences. 2015; ():721-742.

Chicago/Turabian Style

Christopher Cleal; Y.G. Tenchov; Jasenka Sremac; T. Đerek; J Japundžić. 2015. "Pennsylvanian fossil flora from the Velebit Mountains and Lika region (SW Croatia)." Bulletin of Geosciences , no. : 721-742.

Science
Published: 14 August 2013 in Journal of Maps
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Data from selected Lower Pontian sandstone reservoir in the Kloštar Field, situated in the Sava Depression (Northern Croatia), were used for mapping with Sequential Indicator Simulations rather than using a classical approach. Such approaches offer better insight in distribution of geological variables or zonal uncertainties in the cases with larger datasets (15 points or more). Obtained maps of porosity and reservoir thickness are presented here along with probability maps of certain selected cut of values of petrophysical parameters. Maps showed distinct sedimentological features that can clearly be observed on the both sets of maps.

ACS Style

Kristina Novak Zelenika; Marko Cvetković; Tomislav Malvić; Josipa Velić; Jasenka Sremac. Sequential Indicator Simulations maps of porosity, depth and thickness of Miocene clastic sediments in the Kloštar field, Northern Croatia. Journal of Maps 2013, 9, 550 -557.

AMA Style

Kristina Novak Zelenika, Marko Cvetković, Tomislav Malvić, Josipa Velić, Jasenka Sremac. Sequential Indicator Simulations maps of porosity, depth and thickness of Miocene clastic sediments in the Kloštar field, Northern Croatia. Journal of Maps. 2013; 9 (4):550-557.

Chicago/Turabian Style

Kristina Novak Zelenika; Marko Cvetković; Tomislav Malvić; Josipa Velić; Jasenka Sremac. 2013. "Sequential Indicator Simulations maps of porosity, depth and thickness of Miocene clastic sediments in the Kloštar field, Northern Croatia." Journal of Maps 9, no. 4: 550-557.

Journal article
Published: 27 February 2013 in Geological Society, London, Special Publications
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The Late Palaeozoic deposits in Croatia were derived from the Palaeotethyan shelf areas along the northern Gondwana passive continental margin and consist of mixed carbonate–clastic facies. These sedimentary rocks accumulated in the equatorial area along northern Gondwana under a dominantly hot climate and laid the foundations for the future Adriatic Carbonate Platform (AdCP). Detailed classification and geochemical studies of the Permian and Permian–Triassic deposits in most parts of Croatia are still in progress, especially concerning palaeoclimate and regional palaeogeography. The best preserved Permian outcrops can be found in the Velebit mountain area, including continuous Permian–Triassic sections. Stable isotopes of carbon and oxygen from carbonates, with characteristic positive δ13Ccarb excursion during the Late Permian and negative δ13Ccarb excursion at the Permian–Triassic transition combined with palaeontological and sedimentological data, helped in palaeoclimate estimations and the positioning of the chemostratigraphical Permian–Triassic Boundary (PTB). Sedimentological, palaeontological and geochemical data indicate that deposition in the Permian took place mainly in shallow-water tropical areas under oligotrophic conditions. High carbon isotope ratios in Capitanian carbonate rocks (+4 to +6‰ VPDB) mark the ‘Kamura event’ characterized by temporary cooling, high productivity and burial rate. Evaporites in the central part of the Karst Dinarides and red beds of the ‘Gröden type’ indicate a warm and mostly arid climate. Calculations based on the oxygen isotopic compositions of whole-rock carbonate and fossil samples estimate latest Permian temperatures up to 26 °C.

ACS Style

Karmen Fio; Jasenka Sremac; Igor Vlahović; Ivo Velić; Jorge E. Spangenberg. Permian deposits and the Permian–Triassic boundary in Croatia: palaeoclimatic implications based on palaeontological and geochemical data. Geological Society, London, Special Publications 2013, 376, 539 -548.

AMA Style

Karmen Fio, Jasenka Sremac, Igor Vlahović, Ivo Velić, Jorge E. Spangenberg. Permian deposits and the Permian–Triassic boundary in Croatia: palaeoclimatic implications based on palaeontological and geochemical data. Geological Society, London, Special Publications. 2013; 376 (1):539-548.

Chicago/Turabian Style

Karmen Fio; Jasenka Sremac; Igor Vlahović; Ivo Velić; Jorge E. Spangenberg. 2013. "Permian deposits and the Permian–Triassic boundary in Croatia: palaeoclimatic implications based on palaeontological and geochemical data." Geological Society, London, Special Publications 376, no. 1: 539-548.

Journal article
Published: 10 November 2012 in Geologia Croatica
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Sedimentary rocks of Pennsylvanian age outcrop at several regions in Croatia. Most of these rocks were deposited in a marine environment, in different tectonic units: Karst (External) Dinarides, Internal Dinarides and Tisia. Pennsylvanian deposits contain a significant amount of terrestrial debris, related to the uplift of the Hercynian mountain belt and its intense erosion. Remnants of land flora are not common, but are present at almost all localities. The most diverse and the best preserved Pennsylvanian land flora in Croatia was discovered on the Velebit Mt. and in the Lika Region. It was dominated by ferns, pteridosperms and cordaitales. The fossil flora from Banovina is less diverse, with pteridosperms, scarce ferns, horsetails and lycopods. The sporadic occurrence of lycopods and horsetails was reported from the mountains of NW Croatia. In the Gorski Kotar Region only plant detritus was observed. Ferns and pteridosperms from Papuk Mt. were discovered in older, Mississippian deposits. Palaeobotanical data reopen the discussion about the palaeogeographic position of the research areas.

ACS Style

Jasenka Sremac. Influence of terrestrial sedimentation in Pennsylvanian rocks of Croatia. Geologia Croatica 2012, 65, 273 -282.

AMA Style

Jasenka Sremac. Influence of terrestrial sedimentation in Pennsylvanian rocks of Croatia. Geologia Croatica. 2012; 65 (3):273-282.

Chicago/Turabian Style

Jasenka Sremac. 2012. "Influence of terrestrial sedimentation in Pennsylvanian rocks of Croatia." Geologia Croatica 65, no. 3: 273-282.