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Dr. Ramona Balc
Faculty of Environmental Science and Engineering, Babeș-Bolyai University, 30 Fântânele, 400294 Cluj-Napoca, Romania

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0 Hydrogeology
0 Soil Fertility
0 Environmental sciences
0 Soil analysis
0 Sustainability, environment protection

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Research article
Published: 25 July 2020 in Geomicrobiology Journal
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The aim of this study was to investigate the extent of heavy metal (HM) pollution and its effect on microorganisms from rhizosphere soil in Baia Mare area (Maramureş County, Romania). Two sites with different contamination degrees were included in the study: one with a long history of mining activities and one within a drinking water safeguard zone. Rhizosphere soil samples were characterized with respect to physico-chemical parameters and the Cd, Cu, Pb and Zn contents. Native bacteria were investigated for HM tolerance and biofilm formation under toxic exposure by the microdilution assay. The most resistant strains were identified and the minimum inhibitory concentrations for HMs were determined. Cd, Cu, Pb and Zn exceeded the intervention threshold in Bozânta tailings site, while Pb content exceeded the intervention level within the area of the drinking water treatment plant. Cd showed a very high potential ecological risk in Bozânta area. The long-term exposure to HMs contributed to the selection of HM-tolerant and weakly adherent strains. Biofouling was significantly reduced under the influence of copper ions. Arthrobacter, Rhodococcus and Acidovorax strains with exceptional resistant profiles were isolated from the tailings site, indicating the important role of native microorganisms in rhizosphere ecosystems of contaminated sites.

ACS Style

Anca Farkas; Florina Mereuti; Anca Butiuc-Keul; Dorina Podar; Carmen Roba; Ramona Bălc. Effects of Long-Term exposure to Heavy Metals upon Rhizosphere Bacteria from Baia Mare Area (Maramureş County, Romania). Geomicrobiology Journal 2020, 37, 867 -876.

AMA Style

Anca Farkas, Florina Mereuti, Anca Butiuc-Keul, Dorina Podar, Carmen Roba, Ramona Bălc. Effects of Long-Term exposure to Heavy Metals upon Rhizosphere Bacteria from Baia Mare Area (Maramureş County, Romania). Geomicrobiology Journal. 2020; 37 (9):867-876.

Chicago/Turabian Style

Anca Farkas; Florina Mereuti; Anca Butiuc-Keul; Dorina Podar; Carmen Roba; Ramona Bălc. 2020. "Effects of Long-Term exposure to Heavy Metals upon Rhizosphere Bacteria from Baia Mare Area (Maramureş County, Romania)." Geomicrobiology Journal 37, no. 9: 867-876.

Journal article
Published: 03 January 2019 in Science of The Total Environment
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The increasing contamination of fresh water resources by trace metals and persistent organic pollutants is a major environmental concern. In the present study, we investigated, for the first time, the distribution, sources and ecological risk of trace metals and organic pollutants, including polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs), in surface sediments from a Southeastern European river (Someşu Mic River, Romania). Concentrations of Cd, Cr, Cu, Pb, Ni and Zn ranged from 0.04 to 0.4, 9.4 to 43.15, 7.2 to 65.6, 12.3 to 131.4, 14.7 to 47.7 and 42.1 to 236.8 mg kg−1 dw, respectively. Concentrations of total PAHs, PCBs and OCPs ranged from 24.8 to 575.6, 2.7 to 252.7 and 2.1 to 44.3 ng g−1 dw, respectively. Some sediment parameters, i.e., pH, total organic carbon (TOC) and total organic matter (OM) contents, played a significant role in the spatial distribution of contaminants. A combined analysis based on diagnostic ratios and multivariate analyses revealed PAHs originating mainly from pyrolytic sources. PCB compositions showed distinct contamination signatures for tri- to tetra-chlorinated PCBs, characteristic of contamination by Aroclor-1016 and -1254 technical mixtures. The dominant OCP congeners were α-HCH and p,p′-DDD, reflecting past use of technical HCHs and DDTs in agricultural practices. Metal source and pollution status was assessed using geoaccumulation index and enrichment factor, which indicate widespread pollution by Pb, Cd, Zn, Ni and Cu. The use of Sediments Quality Guidelines (SQGs), mean effect range-median quotient (m-ERM-Q) and toxic equivalent factor (TEF) indicated that the highest ecological risks occurred for PCBs and DDTs. This work presents not only initial baseline information on the extent of organic and inorganic contaminations in a river of ecological and economical interest, but also provides a diagnostic ratio/statistical combined approach that can be used to evaluate sediment quality in similar environments.

ACS Style

Badreddine Barhoumi; Mihail Simion Beldean-Galea; Abdulla M. Al-Rawabdeh; Carmen Roba; Ildiko Melinda Martonoș; Ramona Balc; Massoud Kahlaoui; Soufiane Touil; Marc Tedetti; Mohamed Ridha Driss; Călin Baciu. Occurrence, distribution and ecological risk of trace metals and organic pollutants in surface sediments from a Southeastern European river (Someşu Mic River, Romania). Science of The Total Environment 2019, 660, 660 -676.

AMA Style

Badreddine Barhoumi, Mihail Simion Beldean-Galea, Abdulla M. Al-Rawabdeh, Carmen Roba, Ildiko Melinda Martonoș, Ramona Balc, Massoud Kahlaoui, Soufiane Touil, Marc Tedetti, Mohamed Ridha Driss, Călin Baciu. Occurrence, distribution and ecological risk of trace metals and organic pollutants in surface sediments from a Southeastern European river (Someşu Mic River, Romania). Science of The Total Environment. 2019; 660 ():660-676.

Chicago/Turabian Style

Badreddine Barhoumi; Mihail Simion Beldean-Galea; Abdulla M. Al-Rawabdeh; Carmen Roba; Ildiko Melinda Martonoș; Ramona Balc; Massoud Kahlaoui; Soufiane Touil; Marc Tedetti; Mohamed Ridha Driss; Călin Baciu. 2019. "Occurrence, distribution and ecological risk of trace metals and organic pollutants in surface sediments from a Southeastern European river (Someşu Mic River, Romania)." Science of The Total Environment 660, no. : 660-676.

Original article
Published: 03 January 2019 in Facies
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The middle Miocene carbonates from the NW part of the Transylvanian Basin are represented mainly by rhodalgal facies. This paper provides an accurate taxonomic account of the red algal assemblages, facies analysis, and paleoenvironmental interpretation of the Badenian deposits outcropping in Vălenii Șomcutei area. A total of 13 red algal species belonging to the orders Corallinales, Hapalidiales, Sporolithales, and Peyssonneliales have been identified. The microfacies distinguished in the succession (bio-extraclastic grainstone, oolitic packstone/grainstone, bio-extraclastic packstone/grainstone, rhodolith rudstone, coralline algal rudstone, and coralline algal debris grainstone) suggest a general shallowing-upward succession, from an open-marine middle-outer ramp setting to an inner-ramp environment.

ACS Style

Ramona Chelaru; Emanoil Săsăran; Tudor Tămaș; Ramona Balc; Ioan I. Bucur; George Pleș. Middle Miocene carbonate facies with rhodoliths from the NW Transylvanian Basin (Vălenii Șomcutei Cave, Romania). Facies 2019, 65, 4 .

AMA Style

Ramona Chelaru, Emanoil Săsăran, Tudor Tămaș, Ramona Balc, Ioan I. Bucur, George Pleș. Middle Miocene carbonate facies with rhodoliths from the NW Transylvanian Basin (Vălenii Șomcutei Cave, Romania). Facies. 2019; 65 (1):4.

Chicago/Turabian Style

Ramona Chelaru; Emanoil Săsăran; Tudor Tămaș; Ramona Balc; Ioan I. Bucur; George Pleș. 2019. "Middle Miocene carbonate facies with rhodoliths from the NW Transylvanian Basin (Vălenii Șomcutei Cave, Romania)." Facies 65, no. 1: 4.

Journal article
Published: 01 June 2018 in Geologica Carpathica
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Sediments belonging to the Oligocene Vima Formation (located in the north-western part of the Transylvanian Basin, Romania) have been investigated for calcareous nannofossils content. Biostratigraphically, the sedimentary succession is late Rupelian–Chattian in age, belonging to the NP24 —Sphenolithus distentusand NP25 —Sphenolithus ciperoensisbiozones, to CP19a —Cyclicargolithus floridanusand CP19b —Reticulofenestra bisectaSubzones and to the interval from CNO4 —Sphenolithus distentus/Sphenolithus predistentusCRZ to CNO5 —Sphenolithus ciperoensisTZ. The palaeoenvironment of the Fântânele section was reconstructed by means of calcareous nannofossils and statistics. Multivariate statistics were applied to the composition of autochthonous assemblages and the obtained clusters were used to assess the palaeoecological preferences of the nannofossils. We document changes from more stable open-marine regime, with temperate sea-surface temperatures interfering locally with influx of cooler water and enriched cool-nutrient supply for the late Rupelian–earliest Chattian (NP24), to shallower and possibly warmer near-shore marine eutrophic environment, with salinity fluctuations, increased terrigenous material run-off and freshwater influx for the remaining early Chattian (NP25).

ACS Style

Mădălina-Elena Kallanxhi; Ramona Balc; Stjepan Ćorić; Szabolcs-Flavius Székely; Sorin Filipescu. The Rupelian–Chattian transition in the north-western Transylvanian Basin (Romania) revealed by calcareous nannofossils: implications for biostratigraphy and palaeoenvironmental reconstruction. Geologica Carpathica 2018, 69, 264 -282.

AMA Style

Mădălina-Elena Kallanxhi, Ramona Balc, Stjepan Ćorić, Szabolcs-Flavius Székely, Sorin Filipescu. The Rupelian–Chattian transition in the north-western Transylvanian Basin (Romania) revealed by calcareous nannofossils: implications for biostratigraphy and palaeoenvironmental reconstruction. Geologica Carpathica. 2018; 69 (3):264-282.

Chicago/Turabian Style

Mădălina-Elena Kallanxhi; Ramona Balc; Stjepan Ćorić; Szabolcs-Flavius Székely; Sorin Filipescu. 2018. "The Rupelian–Chattian transition in the north-western Transylvanian Basin (Romania) revealed by calcareous nannofossils: implications for biostratigraphy and palaeoenvironmental reconstruction." Geologica Carpathica 69, no. 3: 264-282.

Journal article
Published: 01 February 2018 in Radiation Measurements
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ACS Style

O. Antohi-Trandafir; Alida Timar-Gabor; Adriana Vulpoi; Ramona Balc; Jack Longman; Daniel Veres; S. Simon. Luminescence properties of natural muscovite relevant to optical dating of contaminated quartz samples. Radiation Measurements 2018, 109, 1 -7.

AMA Style

O. Antohi-Trandafir, Alida Timar-Gabor, Adriana Vulpoi, Ramona Balc, Jack Longman, Daniel Veres, S. Simon. Luminescence properties of natural muscovite relevant to optical dating of contaminated quartz samples. Radiation Measurements. 2018; 109 ():1-7.

Chicago/Turabian Style

O. Antohi-Trandafir; Alida Timar-Gabor; Adriana Vulpoi; Ramona Balc; Jack Longman; Daniel Veres; S. Simon. 2018. "Luminescence properties of natural muscovite relevant to optical dating of contaminated quartz samples." Radiation Measurements 109, no. : 1-7.

Journal article
Published: 22 August 2016 in Geological Quarterly
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A whole-rock geochemical study was carried out on sandstones from the Upper Cretaceous Bozeş Formation in the southeastern part of the Apuseni Mountains (Romania) in order to constrain their provenance and depositional setting. The geochemical results were compared and integrated with previously reported provenance indicators, such as framework composition and heavy mineral assemblages. The chemical composition is similar for all samples investigated, with limited ranges for both major oxides and trace elements. The sandstones are potassic (Na2O/K2O < 1) and can be classified mainly as arenites with a few greywackes. Their immature to relatively mature character is revealed by the SiO2/Al2O3 ratios, ranging between 3.90 and 11.25, as well as their high Sr/Rb ratios. The source rocks were affected by weak to moderate chemical alteration, as indicated by the specific index (CIA), with values between 47 and 71. The detrital material was influenced by a little hydraulic sorting during transportation, while post-depositional effects were limited to K-metasomatism. Two major potential source types were identified based on the chemical composition of the samples studied: a felsic magmatic arc and a recycled, quartzose metasedimentary basement. Our data indicate that the depositional setting is likely to be on a convergent margin. The results are consistent with uplifted and exhumed Transylvanian basement as the major source area.

ACS Style

Luminiţa Zaharia; Ramona Balc; Cosmin Ciprian Stremtan; Adriana Socaciu. Geochemistry of Upper Cretaceous of the Bozeş Formation (Apuseni Mts., Romania) – provenance implications. Geological Quarterly 2016, 60, 1 .

AMA Style

Luminiţa Zaharia, Ramona Balc, Cosmin Ciprian Stremtan, Adriana Socaciu. Geochemistry of Upper Cretaceous of the Bozeş Formation (Apuseni Mts., Romania) – provenance implications. Geological Quarterly. 2016; 60 (3):1.

Chicago/Turabian Style

Luminiţa Zaharia; Ramona Balc; Cosmin Ciprian Stremtan; Adriana Socaciu. 2016. "Geochemistry of Upper Cretaceous of the Bozeş Formation (Apuseni Mts., Romania) – provenance implications." Geological Quarterly 60, no. 3: 1.

Journal article
Published: 29 June 2015 in Geological Quarterly
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Foraminiferal and calcareous nannofossil assemblages from the Eastern Carpathians (northern part of the Tarcău Nappe, Romania) were documented and correlated in order to reconstruct the palaeonvironmental settings and provide a biostratigraphic framework of the Plopu Formation. The benthic foraminiferal assemblages are dominated by flysch-type agglutinated taxa, suggesting a bathyal palaeodepth with frequent oscillations of the carbon compensation depth. The agglutinated foraminifera morphogroup analyses suggest different levels of organic matter influx and oxygenation. Both the foraminifera and calcareous nannofossil assemblages suggest a shift between the warm mid Eocene to the cooler late Eocene climate. Biostratigraphic data based on calcareous nannofossils (NP15–NP19/NNTe8–NNTe12 biozones) helped to establish the age of the formation. Four assemblages of benthic agglutinated foraminifera ( Psammosiphonella cylindrica – Nothia excelsa ; Paratrochamminoides spp. – Trochamminoides spp.; Karrerulina spp.– Reticulophragmium amplectens ; Spiroplectammina spectabilis ) correlated with calcareous nannofossil bioevents supported the placement of the mid to late Eocene transition within the Plopu Formation.

ACS Style

Raluca Bindiu; Sorin Filipescu; Ramona Balc; Lavinia Cociș; Delia Gligor. The mid/late Eocene transition in the Eastern Carpathians (Romania) based on foraminifera and calcareous nannofossil assemblages. Geological Quarterly 2015, 59, 38 .

AMA Style

Raluca Bindiu, Sorin Filipescu, Ramona Balc, Lavinia Cociș, Delia Gligor. The mid/late Eocene transition in the Eastern Carpathians (Romania) based on foraminifera and calcareous nannofossil assemblages. Geological Quarterly. 2015; 59 (4):38.

Chicago/Turabian Style

Raluca Bindiu; Sorin Filipescu; Ramona Balc; Lavinia Cociș; Delia Gligor. 2015. "The mid/late Eocene transition in the Eastern Carpathians (Romania) based on foraminifera and calcareous nannofossil assemblages." Geological Quarterly 59, no. 4: 38.

Journal article
Published: 01 May 2014 in Cretaceous Research
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ACS Style

Mátyás Vremir; Ramona Bălc; Zoltan Csiki-Sava; Stephen Brusatte; Gareth Dyke; Darren Naish; Mark A. Norell. Petreşti-Arini – An important but ephemeral Upper Cretaceous continental vertebrate site in the southwestern Transylvanian Basin, Romania. Cretaceous Research 2014, 49, 13 -38.

AMA Style

Mátyás Vremir, Ramona Bălc, Zoltan Csiki-Sava, Stephen Brusatte, Gareth Dyke, Darren Naish, Mark A. Norell. Petreşti-Arini – An important but ephemeral Upper Cretaceous continental vertebrate site in the southwestern Transylvanian Basin, Romania. Cretaceous Research. 2014; 49 ():13-38.

Chicago/Turabian Style

Mátyás Vremir; Ramona Bălc; Zoltan Csiki-Sava; Stephen Brusatte; Gareth Dyke; Darren Naish; Mark A. Norell. 2014. "Petreşti-Arini – An important but ephemeral Upper Cretaceous continental vertebrate site in the southwestern Transylvanian Basin, Romania." Cretaceous Research 49, no. : 13-38.

Journal article
Published: 24 April 2013 in Geological Quarterly
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We present the first record of benthic foraminiferal assemblages from 92 samples collected at approx. 3 m resolution in the bottom part of Hole U1341B drilled in the southern Bering Sea during Integrated Ocean Drilling Program (IODP) Expedition 323. Pliocene agglutinated foraminifera are generally rare within highly diatomaceous claystones occurring from the base of the hole at 601.87 m below sea floor (mbsf) to ~320 mbfs. The agglutinated foraminiferal assemblages are strongly dominated by the infaunal genera Eggerella, Karreriella, Martinottiella, and Spirosigmoilina . The calcareous-cemented Eggerella and Martinottiella are canaliculated with pores that are open to the test surface. Tubular agglutinated foraminifera are rare and are only found in isolated samples. The ecological information gained from this assemblage supports other proxy information indicating high levels of organic productivity and severely hypoxic conditions in the Bering Sea deep water during the Pliocene.

ACS Style

Michael A. Kaminski; Sev Kender; Agnieszka Ciurej; Ramona Balc; Eiichi Setoyama. Pliocene agglutinated benthic Foraminifera from Site U1341 in the Bering Sea (IODP Expedition 323). Geological Quarterly 2013, 57, 1 .

AMA Style

Michael A. Kaminski, Sev Kender, Agnieszka Ciurej, Ramona Balc, Eiichi Setoyama. Pliocene agglutinated benthic Foraminifera from Site U1341 in the Bering Sea (IODP Expedition 323). Geological Quarterly. 2013; 57 (2):1.

Chicago/Turabian Style

Michael A. Kaminski; Sev Kender; Agnieszka Ciurej; Ramona Balc; Eiichi Setoyama. 2013. "Pliocene agglutinated benthic Foraminifera from Site U1341 in the Bering Sea (IODP Expedition 323)." Geological Quarterly 57, no. 2: 1.

Journal article
Published: 01 April 2013 in Geologica Carpathica
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Late Cretaceous foraminiferal and calcareous nannoplankton assemblages from the northern part of the Tarcău Nappe, Hangu Formation in the northern Eastern Carpathians are documented in order to reconstruct paleoenvironmental settings and biostratigraphy. The foraminiferal assemblages are dominated by flysch-type agglutinated taxa suggesting bathyal environments, close to the calcite compensation depth (CCD), and mesotrophic to oligotrophic conditions. The morphogroup analyses display variations in tubular and infaunal morphotypes suggesting different levels of oxygenation and seafloor disturbance caused by currents. Reddish hemipelagites containing only agglutinated foraminifera (dominant infaunal forms) occurring in the middle part of the section suggest an increase of water depth and changes in redox conditions. Based on foraminifera, the deposits were assigned to planktonic Globotruncana ventricosa and agglutinated Caudammina gigantea Zones. The first occurrence of Uniplanarius trifidus and last occurrence of Reinhardtites anthophorus demonstrate the presence of Late Campanian UC15cTP-UC16/CC21-CC23 calcareous nannoplankton Zones. Foraminiferal and nannofossil assemblages in the red beds have a high potential for stratigraphic correlation on a regional scale.

ACS Style

Raluca Bindiu; Sorin Filipescu; Ramona Balc. Biostratigraphy and paleoenvironment of the Upper Cretaceous deposits in the northern Tarcău Nappe (Eastern Carpathians) based on foraminifera and calcareous nannoplankton. Geologica Carpathica 2013, 64, 117 -132.

AMA Style

Raluca Bindiu, Sorin Filipescu, Ramona Balc. Biostratigraphy and paleoenvironment of the Upper Cretaceous deposits in the northern Tarcău Nappe (Eastern Carpathians) based on foraminifera and calcareous nannoplankton. Geologica Carpathica. 2013; 64 (2):117-132.

Chicago/Turabian Style

Raluca Bindiu; Sorin Filipescu; Ramona Balc. 2013. "Biostratigraphy and paleoenvironment of the Upper Cretaceous deposits in the northern Tarcău Nappe (Eastern Carpathians) based on foraminifera and calcareous nannoplankton." Geologica Carpathica 64, no. 2: 117-132.

Journal article
Published: 01 October 2011 in Cretaceous Research
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ACS Style

Claudia G. Cetean; Ramona Bălc; Michael A. Kaminski; Sorin Filipescu. Integrated biostratigraphy and palaeoenvironments of an upper Santonian – upper Campanian succession from the southern part of the Eastern Carpathians, Romania. Cretaceous Research 2011, 32, 575 -590.

AMA Style

Claudia G. Cetean, Ramona Bălc, Michael A. Kaminski, Sorin Filipescu. Integrated biostratigraphy and palaeoenvironments of an upper Santonian – upper Campanian succession from the southern part of the Eastern Carpathians, Romania. Cretaceous Research. 2011; 32 (5):575-590.

Chicago/Turabian Style

Claudia G. Cetean; Ramona Bălc; Michael A. Kaminski; Sorin Filipescu. 2011. "Integrated biostratigraphy and palaeoenvironments of an upper Santonian – upper Campanian succession from the southern part of the Eastern Carpathians, Romania." Cretaceous Research 32, no. 5: 575-590.

Journal article
Published: 01 June 2010 in Geologica Carpathica
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An Early Miocene biserial foraminiferal event in the Transylvanian Basin (Romania)Investigations of the Lower Miocene of the Transylvanian Basin reveal particularly high abundances (> 90 % of total foraminifera) of small sized biserial foraminifera (Bolivina/Streptochilus). This biotic event has not been noticed in the Transylvanian Basin so far probably owing to the facies misinterpretation and the small size of the specimens. SEM investigations allow more precise identification of biserial planktonic taxa and more accurate taxonomic interpretations. The high abundance ofBolivina/Streptochilusassemblages provide evidence for paleogeographic connections to the Indo-Pacific area and support new paleoenvironmental interpretations at the transition from the Early to Middle Miocene in relation to the paleoceanographic events. Both planktonic foraminifera and calcareous nannoplankton suggest a late Burdigalian age. A newBolivina/StreptochilusAbundance Biozone is proposed just below the Early/Middle Miocene boundary.

ACS Style

Claudia Beldean; Sorin Filipescu; Ramona Balc. An Early Miocene biserial foraminiferal event in the Transylvanian Basin (Romania). Geologica Carpathica 2010, 61, 227 -234.

AMA Style

Claudia Beldean, Sorin Filipescu, Ramona Balc. An Early Miocene biserial foraminiferal event in the Transylvanian Basin (Romania). Geologica Carpathica. 2010; 61 (3):227-234.

Chicago/Turabian Style

Claudia Beldean; Sorin Filipescu; Ramona Balc. 2010. "An Early Miocene biserial foraminiferal event in the Transylvanian Basin (Romania)." Geologica Carpathica 61, no. 3: 227-234.

Journal article
Published: 01 August 2008 in Studia Universitatis Babes-Bolyai, Geologia
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Planktonic and benthic foraminiferal assemblages from an Upper Albian to Lower Turonian interval in the East Carpathians were investigated in a well and in an outcrop from the Stoeneşti – Cetăţeni area (Dâmboviţa Valley), Romania. The benthic foraminiferal extinction that occurred at the Cenomanian/Turonian boundary and the first stage of the faunal recovery are documented here for the first time in the Romanian Carpathians. Bioevents and changes in the foraminiferal record from this area show that low oxygen conditions occured already in the Late Cenomanian, as suggested by the presence of radiolarian-rich shales. Impoverished assemblages of small, thin walled agglutinated foraminifera are present in the lowermost Turonian after the benthic-free interval corresponding to the “Bonarelli Level”. Calcareous nannofossils are also documented from this level in the well from the Stoeneşti locality.

ACS Style

Claudia Cetean; Ramona Bălc; Michael Kaminski; Sorin Filipescu. Biostratigraphy of the Cenomanian-Turonian boundary in the Eastern Carpathians (Dâmbovi?a Valley): preliminary observations. Studia Universitatis Babes-Bolyai, Geologia 2008, 53, 11 -23.

AMA Style

Claudia Cetean, Ramona Bălc, Michael Kaminski, Sorin Filipescu. Biostratigraphy of the Cenomanian-Turonian boundary in the Eastern Carpathians (Dâmbovi?a Valley): preliminary observations. Studia Universitatis Babes-Bolyai, Geologia. 2008; 53 (1):11-23.

Chicago/Turabian Style

Claudia Cetean; Ramona Bălc; Michael Kaminski; Sorin Filipescu. 2008. "Biostratigraphy of the Cenomanian-Turonian boundary in the Eastern Carpathians (Dâmbovi?a Valley): preliminary observations." Studia Universitatis Babes-Bolyai, Geologia 53, no. 1: 11-23.