Lower Devonian palaeoshelf deposits extend along the western margin of the East European Platform from the Baltic Sea to the Black Sea. These deposits have been studied on the territory of Ukraine (Volyn-Podillyan Plate, Dobrogean Foredeep) and correlated with coeval deposits in Moldova and Romania (Moldovian Platform). The investigation of the Lower Devonian deposits, their thickness, petrographic and lithological characteristics allowed reconstruction of two types of lithofacies and distinguishing two different depositional environments. The first lithofacies belonging to the Lochkovian stage, consists of clayey-carbonate rocks and represents a continuation of the Upper Silurian marine strata. The other lithofacies encompassing the Pragian–Emsian comprises terrigenous reddish-brown rocks, which are roughly equivalent to the Old Red Sandstone, completes the Lower Devonian section. Establishing the occurrence and thickness distribution of the terrigenous lithofacies across the study area is important, because it forms potential reservoir rocks for both conventional and unconventional (tight gas) hydrocarbons. Gas accumulation in these reservoir rocks has been discovered at the Lokachi field.
Algeo, T. J. & Scheckler, S. E. 1998. Terrestrial-marine teleconnections in the Devonian: links between the evolution of land plants, weathering processes, and marine anoxic events. Philosophical Transactions of the Royal Society of London, Series B, 353, 113–130.
Barbu, C., Mehmet, N. A & Cornelia, C. 1969. Paleozoicul din Vorlandul Carpaţilor Orientali, între Valea Buzăului şi graniţa de nord a Republicii Socalste Romănia [Paleozoic Foreland of the Eastern Carpathians, between Buzau valley and the northern border of the Romanian Socialist Republic]. Petrol şi Gaze, 20, 863–867 [in Romanian].
Berner, R. A. 2001. Modeling atmospheric O2 over Phanerozoic time. Geochimica et Cosmochimica Acta, 65, 685–694.
Berner, R. A. & Kothavala, Z. 2001. GEOCARB III: a revised model of atmospheric CO2 over Phanerozoic time. American Journal of Science, 301, 182–204.
Blomeier, D., Wisshak, M., Joachimski, M., Freiwald, F. & Volohonsky, E. 2003. Calcareous, alluvial and lacustrine deposits in the Old Red Sandstone of central north Spitsbergen (Wood Bay Formation, Early Devonian). Norwegian Journal of Geology, 83, 281–298.
Chebanenko, I. I., Vishnyakov, I. B. & Vlasov, B. I. 1990. Geotektonika Volyno-Podolii [Geotectonics of the Volyno-Podolia]. Naukova Dumka, Kiev, 244 рр. [in Russian].
Dahl, T. W., Hammarlund, E. U., Anbar, A. D., Bond, D. P. G., Gill, B. C., Gordon, G. W., Knoll, A. H., Nielsen A. T. & Canfield, D. E. 2010. Devonian rise of atmospheric oxygen correlated to the radiations of terrestrial plants and predatory fish. Proceedings of the National Academy of Sciences of the USA, 107, 17911–17915.
Drygant, D. M. 2000. Lower and Middle Paleozoic of the Volyn-Podillyan margin of the East-European Platform and Carpathian Foredeep. Naukovi Zapysky Derzhavnoho Pryrodoznavchoho Muzeyu, 15, 24–87 [in Ukrainian, with English summary].
Drygant, D. M., Gavrylyshyn, V. I. & Gynda, V. A. 1982. Verkhnij dokembrij-nizhnij paleozoj Srednego Pridnestrovya [Upper Precambrian–Lower Paleozoic of the Srednee Prydnistrovya]. Naukova Dumka, Kiev, 108 pp. [in Russian].
Fedyshyn, V. O. (ed.). 1998. Atlas of Oil and Gas Fields of Ukraine. Vol. 4. Ukrainian Oil and Gas Academy, Lviv, 328 pp.
Filipiak, P., Zatoń, M., Szaniawski, H., Wrona, R. & Racki, G. 2012. Palynology and microfacies of Lower Devonian mixed carbonate–siliciclastic deposits in Podolia, Ukraine. Acta Palaeontologica Polonica, 57, 863–877.
Friend, P. F. 1969. Tectonic features of Old Red sedimentation in North Atlantic borders. The American Association of Petroleum Geologists Memoir, 12, 703–710.
Friend, P. F., Williams, B. P. J., Ford, M. & Williams, E. A. 2000. Kinematics and dynamics of the Old Red Sandstone basins. In New Perspectives on the Old Red Sandstone (Friend, P. F. & Williams, B. P. J., eds), Geological Society, London, Special Publication, 180, 29–60.
Galabuda, M., Krupsky, Y., Pavlyuk, О. & Chepil, P. 2007. History of investigation of geological structure and oil and gas bearing perspectives of Volyno-Podillya. Geologiya i Geokhimiya Goryuchykh Kopalyn, 3, 5–18 [in Ukrainian, with English summary].
Gnidets, V. P., Grigorchuk, K. G., Polukhtovych, B. M. & Fedyshyn, V. O. 2002. Lithogenesis of Devonian Deposits of Dobrogea Foredeep (Palaeooceanography, Sedimentary Cyclicity, Reservoir Rocks’ Formation). UkrDGRI, Lviv, 85 рр. [in Ukrainian, with English summary].
Golonka, J. 2007. Phanerozoic paleoenvironment and paleolithofacies maps. Late Paleozoic. Geologia, 33, 145–209.
Golonka, J. & Gawęda, A. 2012. Plate tectonic evolution of the southern margin of Laurussia in the Paleozoic. In Tectonics – Recent Advances (Sharkov, E., ed.), pp. 261–282. InTech.
Grishchenko, V. P., Gurevich, K. Y. & Polukhtovych, B. M. 1986. New data on Palaeozoic deposits of the Western Fore-Black Sea area. Tektonika i Stratigrafiya, 27, 52–59 [in Russian, with English summary].
Gutiérrez, C., Felipe, T., Osorio, N. & Restrepo, D. P. 2009. Unconventional natural gas reservoirs. Energética, 41, 61–72.
Haq, B. U. & Schutter, S. R. 2008. A chronology of Paleozoic sea-level changes. Science, 322, 64–68.
Histon, K., Klein, P., Schönlaub, H. P. & Huff, W. D. 2007. Lower Palaeozoic K-bentonites from the Carnic Alps, Austria. Austrian Journal of Earth Sciences, 100, 26–42.
Holditch, S. A. 2006.Tight gas sands. SPE. 103356. Journal of Petroleum Technology, 58, 86–93.
Huff, W. D., Bergström, S. M. & Kolata, D. R. 2000. Silurian K-bentonites of the Dnestr Basin, Podolia, Ukraine. Journal of the Geological Society, 157, 493–504.
Joachimski, M. M., Breisig, S., Buggisch, W., Talent, J. A., Mawson, R., Gereke, M., Morrow, J. M., Day, J. & Weddige, K. 2009. Devonian climate and reef evolution: insights from oxygen isotopes in apatite. Earth and Planetary Science Letters, 284, 599–609.
Kiessling, W., Flügel, E. & Golonka, J. 2003. Patterns of Phanerozoic carbonate platform sedimentation. Lethaia, 36, 195–226.
Kleesment, A. & Mark-Kurik, E. 1997. Devonian. Lower Devonian. Middle Devonian. In Geology and Mineral Resources of Estonia (Raukas, A. & Teedumäe, A., eds), pp. 65–72. Estonian Academy Publishers, Tallinn.
Kruglov, С. С. & Tsypko, A. K. 1988. Tektonika Ukrainy [Tectonics of Ukraine]. Nedra, Moscow, 254 pp. [in Russian].
Kurovets, І., Drygant, D., Naumko, I., Kurovets, S. & Koltun, Y. 2012. Geological and physical-chemical characteristics of Lower Paleozoic deposits of Volyno-Podillya, Western Ukraine. Biuletyn Państwowego Instytutu Geologicznego, 449, 119–130.
Mark-Kurik, E. & Põldvere, A. 2012. Devonian stratigraphy in Estonia: current state and problems. Estonian Journal of Earth Sciences, 61, 33–47.
McClay, K. R., Norton, M. G., Coney, P. & Davis, G. H. 1986. Collapse of the Caledonian orogen and the Old Red Sandstone. Nature, 323, 147–149.
Mutihac, V., Stratulat, M. I. & Fechet, R. M. 2007. Geologia României [Geology of Romania]. Editura Didactică şi Pedagogică, Bucureşti, 249 pp. [in Romanian].
Narkiewicz, M. 2011. Lithostratigraphy, depositional systems and transgressive-regressive cycles in the Middle Devonian to Frasnian of the Łysogóry-Radom Basin (south-eastern Poland). Prace Państwowego Instytutu Geologicznego, 196, 7–52 [in Polish, with English summary].
Nikiforova, O. I., Predtechensky, N. N., Abushik, A. F., Ignatovitch, M. M., Modzalevskaya, T. L., Berger, A. Y., Novoselova, L. S. & Burkov, Y. K. 1972. Opornyj razrez silura i nizhnego devona Podolii [Basic Section of the Silurian and Lower Devonian of Podolia]. Nauka, Leningrad, 262 pр. [in Russian].
Paraschiv, D., Dăneţ, N., Popescu, M. & Dumitrescu, V. 1983. The present stage of pre-Jurassic deposits knowledge in South Dobrogea. Anuarul Institutului de Geologie şi Geofizică, 59, 29–37.
Poprawa, P., Sliaupa, S., Stephenson, R. & Lazauskiene, J. 1999. Late Vendian–Early Palaeozoic tectonic evolution of the Baltic Basin: regional tectonic implications from subsidence analysis. Tectonophysics, 314, 219–239.
Pożaryski, W., Tomczyk, H. & Brochwicz-Lewiński, W. 1982. Tectonics and paleotectonic evolution of the pre-Permian Paleozoic between Koszalin and Toruń (Pomerania). Przegląd Geologiczny, 30, 658–665 [in Polish, with English summary].
Prodan, J. 1987. Prezenţa gedinianului in platforma Moldovenească [The presence of Gedinian in the Moldavian Platform]. Geologie, 32, 90–98.
Racki, G. & Turnau, E. 2000. Devonian series and stage boundaries in Poland. Courier Forschungsinstitut Senckenberg, 225, 145–158.
Radkovets, N. 2015. The Silurian of southwestern margin of the East European Platform (Ukraine, Moldova and Romania): lithofacies and palaeoenvironments. Geological Quarterly, 59, 105–118.
Royer, D. L. 2006. CO2-forced climate thresholds during the Phanerozoic. Geochimica et Cosmochimica Acta, 70, 5665–5675.
Safarov, E. I. & Kaptsan, V. K. 1967. O stratigrafii devonskikh i kamennougol´nykh otlozhenij osnovaniya severnogo borta Preddobrudzskogo progiba [The Devonian and Carboniferous stratigraphy of the sediments of the basement of the northern edge of Dobrodgean foredeep]. Paleontologiya, Geologiya i Poleznye Iskopayemye Moldavii, 2, 10–15 [in Russian].
Sahin, A. 2013. Unconventional Natural Gas Potential in Saudi Arabia. Paper SPE 164364 presented at the SPE Middle East Oil and Gas Show and Conference, Manama, Bahrain, 10–13 March. http://dx.doi.org/10.2118/164364-MS.
Seghedi, A. 2012. Palaeozoic formations from Dobrogea and Pre-Dobrogea – An overview. Turkish Journal of Earth Sciences, 21, 669–721 [in Turkish, with English summary].
Shogenova, A., Sliaupa, S., Vaher, R., Shogenov, K. & Pomeranceva, R. 2009. The Baltic Basin: structure, properties of reservoir rocks, and capacity for geological storage of CO2. Estonian Journal of Earth Sciences, 58, 259–267.
Simon, L., Godderis, Y., Buggisch, W., Strauss, H. & Joachimski, M. 2007. Modeling the carbon and sulphur isotope composition of marine sediments: climate evolution during the Devonian. Chemical Geology, 146, 19–38.
Torsvik, T. H., Smethurst, M. A., Meert, J. G., Van der Voo, R., McKerrow, W. S., Brasier, M. D., Strut, B. A. & Walderhaug, H. J. 1996. Continental break-up and collision in the Neoproterozoic and Palaeozoic: a tale of Baltica and Laurentia. Earth-Science Reviews, 40, 229–258.
Tsegelnyuk, P. D. 1981. To stratigraphy of Lower Devonian of the south-western margin of the East-European platform. Tektonika i Stratigrafiya, 21, 3–16 [in Russian, with English summary].
Tsegelnyuk, P. D. 1994. Stratigraphy of the Lower Devonian Deposits of Volyn-Podolia. Geologicheskij Zhurnal, 1, 46–57 [in Ukraine, with English summary].
Turnau, E. & Jakubowska, L. 1989. Early Devonian miospores and age of the Zwoled formation (Old Red Sandstone facies) from Ciepielów IG-1 borehole. Annales Societatis Geologorum Poloniae, 59, 391–416.
Vail, P. R., Mitchum, R. M. & Thompson, S. 1977. Seismic stratigraphy and global changes of sea level, part 4: global cycles of relative changes of sea level. AAPG Memoir, 26, 83–97.
Ver Straeten, C. A. 2004. K-bentonites, volcanic ash preservation, and implications for Lower to Middle Devonian volcanism in the Acadian Orogen, Eastern North America. GSA Bulletin, 116, 474–489.
Von Raumer, J. F., Stampfli, G. M., Borel, G. & Bussy, F. 2002. The organization of pre-Variscan basement areas at the north Gondwanan margin. International Journal of Earth Sciences, 91, 35–52.
Von Raumer, J. F., Stampfli, G. M. & Bussy, F. 2003. Gondwana-derived microcontinents – the constituents of the Variscan and Alpine collisional orogens. Tectonophysics, 365, 7–22.
Young, G. C. 2010. Placoderms (Armored Fish): dominant vertebrates of the Devonian period. Annual Review of Earth and Planetary Sciences, 38, 523–550.