Founded 1934 by Prof. Dr Stefan Bončev
A Geo-Sciences Journal of the Geological Institute “Strashimir Dimitrov”, Bulgarian Academy of Sciences
Official Journal of the Carpathian-Balkan Geological Association

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VOLUME 55 (1)/April 2026

Nikolay Bonev
Department of Geology, Palaeontology and Fossil Fuels, Sofia University “St. Kliment Ohridski”, 1504 Sofia; Bulgarian Academy of Sciences, 1040 Sofia, Bulgaria

A review of magmatic crystallization ages and cooling ages of the Evros ophiolite, eastern Circum-Rhodope Belt, NE Greece

Antoaneta Frantzova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Plamen Ivanov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Nikolai Dobrev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Boyko Berov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Miroslav Krastanov

Comparative analysis of risk assessment methodologies: example of some various specific natural disasters along the southern Bulgarian Black Sea coast

William A. P. Wimbledon
School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, United Kingdom
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Daniela Reháková
Department of Geology and Paleontology, Faculty of Natural Sciences, Comenius University, Ilkovičova 6, 84215 Bratislava, Slovakia
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Silviya Petrova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Camille Frau
Groupement d’Intérêt Paléontologique, Science et Exposition, 60 bd Georges Richard, 83000 Toulon, France
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Diego A. Kietzmann
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Ciencias Geológicas, Ciudad Universitaria, Pabellón II, Intendente Güiraldes 2160, C1428EHA Ciudad Autónoma de Buenos Aires, Argentina
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Rafael López-Martínez
Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Delegación Coyoacán, C.P. 04510, México D.F., Mexico

The calpionellid crisis - the defining marker for the Jurassic/Cretaceous boundary in all continents

Mariana Yossifova
Geological Institute, Bulgarian Academy of Sciences, “Acad. Georgi Bonchev” Str., Bl. 24, 1113 Sofia, Bulgaria
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Greta Eskenazi
Faculty of Geology and Geography, Sofia University “St. Kl. Ohridski”, Tzar Osvoboditel Str. 15, 1504 Sofia, Bulgaria

On the organic affinity of germanium in peat and coals: аn experimental approach

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VOLUME 54 (3)/December 2025

Ivan Zagorchev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Editorial: Fifty years since the resurrection of the journal Geologica Balcanica

Konstantinos Gudulas
Hellenic Survey of Geology and Mineral Exploration (HSGME), West Macedonia Regional Division, 50150, Leykovrysi, Kozani, Greece; Department of Mineral Resources Engineering, Faculty of Engineering, University of Western Macedonia, Kozani, Greece

Tectonic controls and groundwater flow reversal in a post-mining basin: hydrogeological insights from the Zazari–Cheimaditida system, Northern Greece

Stanislav Vassilev
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Christina Vassileva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Gergana Velyanova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria; National Centre of Excellence Mechatronics and Clean Technologies, 8 Boulevard Kliment Ohridski, Sofia 1756, Bulgaria
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Mariya Georgieva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria

Preliminary evaluation on the occurrence of critical elements in Bulgarian coal fly ashes and their potential industrial significance

Atanas Hikov
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Catherine Lerouge
BRGM, BP 6009, 45060 Orléans cédex 2, France
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Elitsa Stefanova
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Geochemistry of alunite from the Pesovets epithermal system, Central Srednogorie Zone, Bulgaria

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VOLUME 54 (2)/August 2025

Rositsa Nikolova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str.bl.107, 1113 Sofia
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Nadia Petrova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str.bl.107, 1113 Sofia
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Vladislav Kostov-Kytin
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str.bl.107, 1113 Sofia
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Rositsa Titorenkova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str.bl.107, 1113 Sofia
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Petko Petrov
Earth and Man National Museum, Cherni Vrah Blvd., 4, 1421 Sofia

Crystal chemistry of epsomite from three Bulgarian localities

Lidiya Kirilova
1Regional Museum of History Kardzhali, 4 Republikanska Str., 6600 Kardzhali, Bulgaria
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Ivan Ivanov
GORUBSO Kardzhali AD, 83 Republikanska Str., 6600 Kardzhali, Bulgaria

Fossil gastropods Campanile meneguzzoi Fuchs, 1870 from the Oligocene of the Eastern Rhodopes (Bulgaria)

Boriana Tchakalova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Metodi Karadjov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Doncho Karastanev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Nikolaya Velitchkova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Determination of distribution coefficient of Pliocene clay (Brusartsi Formation) in the Kozloduy area, Bulgaria

Aleksey Benderev
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Yotzo Yanev
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Mila Trayanova-Koleva
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Dimitar Topaligov
Water Supply and Sewerage Ltd., 4006 Plovdiv, Bulgaria
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Stefan Tsakovski
Sofia University “St. Kliment Ohridski”, Faculty of Chemistry and Pharmacy, 1164, Sofia, Bulgaria
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Veronika Mihaylova
Sofia University “St. Kliment Ohridski”, Faculty of Chemistry and Pharmacy, 1164, Sofia, Bulgaria

Genesis of boron in groundwater in a water supply borehole in the village of Dobri Dol, Plovdiv region, Bulgaria

Tanya Vasileva
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Assessing the quality of groundwater in Bulgaria for irrigation purposes - a spatial approach

Petko Petrov
Earth and Man National Museum, 4 Cherni vrah Blvd., Sofia, Bulgaria
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Stefka Pristavova
University of Mining and Geology St. Ivan Rilski, 1 Prof. Boyan Kamenov str., Studentski Grad, 1700 Sofia, Bulgaria
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Kamelia Marinova
University of Mining and Geology St. Ivan Rilski, 1 Prof. Boyan Kamenov str., Studentski Grad, 1700 Sofia, Bulgaria
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Beyhan Sabri
University of Mining and Geology St. Ivan Rilski, 1 Prof. Boyan Kamenov str., Studentski Grad, 1700 Sofia, Bulgaria

Corundum mineralization in the marbles from the vicinity of Mishevsko village, the Eastern Rhodopes, Bulgaria - preliminary data

Stanislav Vassilev
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Christina Vassileva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Gergana Velyanova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Mariya Georgieva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Vilma Petkova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria

Occurrence of nutrient and contaminant elements in biomass ashes and their significance for potential soil fertilization

Elvin Karimov
Azerbaijan State Oil and Industry University, Department of Oil and Gaz Geology, Az 1010, Baku, Azerbaijan
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Süleyman Dalğıç
İstanbul University-Cerrahpaşa, Department of Geological Engineering, Faculty of Engineering, 344500 Buyukcekmece/Istanbul, Turkiye
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Özkan Coruk
Kocaeli University, Engineering Faculty, Geological Engineering Department, Umuttepe Campus, 41001 İzmit/Kocaeli, Türkiye
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Ömer Ündül
Istanbul Technical University, Mining Faculty, Geological Engineering Department, 34469 Istanbul, Turkiye
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İbrahim Kuşku
İstanbul University-Cerrahpaşa, Department of Geological Engineering, Faculty of Engineering, 344500 Buyukcekmece/Istanbul, Turkiye

Stability assessment of the Pekmez landslide area: a comparison of the 2D Limit Equilibrium Method (2D LEM), 2D Finite Element Method (2D FEM), and 3D Finite Element Method (3D FEM)

DETAILS

VOLUME 54 (1)/April 2025

Boyko Berov
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Georgi Gadzhev
National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Plamen Ivanov
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Nikolai Dobrev
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Vladimir Ivanov
National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Nina Nikolova
Sofia University “St. Kliment Ohridski”, Faculty of Geology and Geography, 1504 Sofia, Bulgaria
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Aglaida Toteva
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Miroslav Krastanov
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Rosen Nankin
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Antoaneta Frantzova
Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Assessment of landslide susceptibility in Bulgaria, in the context of climate change, using the Mora and Vahrson method

Stanislav Vassilev
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Christina Vassileva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Mariya Georgieva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Gergana Velyanova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Lora Bidzhova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 24, Sofia 1113, Bulgaria
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Svetoslav Georgiev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 24, Sofia 1113, Bulgaria

Content, association and modes of occurrence of mercury in biomass ashes and its behaviour during biomass combustion

Alexandre Kounov
Department of Environmental Sciences, Basel University, 4056 Basel, Switzerland
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Jean-Pierre Burg
Geological Institute, ETH-Zentrum, CH-8092 Zürich, Switzerland
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Daniel Bernoulli
Department of Environmental Sciences, Basel University, 4056 Basel, Switzerland; Geological Institute, ETH-Zentrum, CH-8092 Zürich, Switzerland
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Diane Seward
School of Geography, Environment and Earth Sciences, Victoria University, Wellington, New Zealand
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Milorad Antić
Zlatna Reka Resources, 11167 Belgrade, Serbia

Tectonic evolution of the Kraishte area (southwestern Bulgaria and southeastern Serbia) - an overview

DETAILS

VOLUME 53 (3)/December 2024

Elitsa Zareva
University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria
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Valeri Sachanski
University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria; Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Lubomir Metodiev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Boris Valchev
University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria
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Dimitar Sachkov
University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria
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Miroslav Slavchev
University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria
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Daniel Yanev
University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria

Iskar Gorge and Ledenika cave - a brief overview

Stefka Pristavova
University of Mining and Geology, Studentski Grad, Prof, Boyan Kamenov Str., 1700 Sofia, Bulgaria
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Kamelia Marinova
University of Mining and Geology, Studentski Grad, Prof, Boyan Kamenov Str., 1700 Sofia, Bulgaria

Rocks and buildings in the Sofia City center - a geological and historical city tour

Valeri Sachanski
University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria; Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Elitsa Zareva
University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria

The Silurian and the Devonian in the Svoge Unit, Western Bulgaria - a brief overview

Juan Carlos Gutiérrez-Marco
Instituto de Geociencias CSIC-UCM, Severo Ochoa 7, 28040 Madrid, Spain
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Sara Romero
Área de Paleontología GEODESPAL, Facultad de Ciencias Geológicas UCM, José Antonio Novais 12, 28040 Madrid, Spain
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Sofia Pereira
Departamento de Ciências da Terra, Centro de Geociências, Universidade de Coimbra, Rua Sílvio Lima, 3030-790 Coimbra, Portugal
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Petr Štorch
Institute of Geology of the Czech Academy of Sciences, Rozvojová 269, 165 00 Praha 6, Czech Republic

The Ordovician‒Silurian boundary beds in the El Pintado section (Sierra Morena de Sevilla Global UNESCO Geopark, SW Spain)

Annalisa Ferretti
Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, Via Campi 103, I-41125 Modena, Italy
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Paolo Serventi
Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, Via Campi 103, I-41125 Modena, Italy
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Giulia Ferrari
Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, Via Campi 103, I-41125 Modena, Italy
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Maria Giovanna Corriga
Dipartimento di Matematica, Informatica e Geoscienze, Università degli Studi di Trieste, Via Weiss 2, I-34128 Trieste, Italy
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Carlo Corradini
Dipartimento di Matematica, Informatica e Geoscienze, Università degli Studi di Trieste, Via Weiss 2, I-34128 Trieste, Italy

Low-diversity conodont and cephalopod assemblages from the Silurian of the Tinduf Basin, Western Sahara

Polina Andreeva
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Middle and Upper Devonian depositional settings of the Moesian Terrane (northern Bulgaria)

Pavel B. Kabanov
Geological Survey of Canada, 303–33rd Street N.W., Calgary, Alberta T2L 2A7, Canada

The Devonian of Western Canada Sedimentary Basin: enormous yet underused archive of outcrops and exploration wells for fundamental research

Rezeda Tagarieva
Institute of Geology, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences (IG UFRC RAS), 16/2 Karl Marx Str., 450000 Ufa, Russia

Conodont biostratigraphy of the Famennian Makarovian Regional Substage in the Kuk-Karauk section, west slope of the Southern Urals

Pavel B. Kabanov
Geological Survey of Canada, 303–33rd Street N.W., Calgary, Alberta T2L 2A7, Canada
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Sezim N. Mustapayeva
Satbayev University, Satbayev 22, Almaty, Kazakhstan
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Svetlana V. Nikolaeva
Natural History Museum, London, SW7 5BD, UK

An Uppermost Famennian section with ammonoids in Karaganda Region, Central Kazakhstan

Hristo Kiselinov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Evolution of the Paleozoic (Silurian-Devonian?) Sredogriv metamorphics, NW Bulgaria

Ulrich Jansen
Senckenberg Research Institute and Natural History Museum, Senckenberganlage 25, 60325 Frankfurt am Main, Germany

Revised taxonomy and biostratigraphy of brachiopods from the upper Přídolí-lower Eifelian of the Rhenish Massif (Germany)

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Bulgarian Academy of Sciences, Geological Institute, Bulgaria
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