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The role of the Leba Ridge–Riga–Pskov Fault Zone in the tectonic evolution of the deep-facies Livonian Tongue within the Baltic Ordovician–Silurian sedimentary basin: a review; pp. 94–106

Full article in PDF format | 10.3176/earth.2021.07

Igor Tuuling, Kairi Põldsaar


Located in the interior of the East European Craton (EEC), the Baltic Ordovician–Silurian Basin hosts an elongated tongue-like deep-marine depression, the Livonian Tongue (LT), which extends from Sweden across Latvia and separates the Estonian and Lithuanian shallow-marine shelves. The tectonic origin of the LT has been suggested already since its discovery in the early 1960s. However, the nature of tectonic forces and mechanisms behind the evolution of this narrow intracratonic subsidence zone in the Ordovician–Silurian of the Baltic Basin has remained poorly understood. The origin of the LT can be related to an extensive intracratonic dislocation zone known as the Leba Ridge–Riga–Pskov Fault Zone (LeRPFZ) that coincides largely with the axis of the LT. The LeRPFZ reveals some heavily uplifted basement blocks and has, therefore, been considered as an up-warped anticline-type structure. Recent studies show that the LT has developed in highly complex and changing stress field conditions during the Caledonian orogeny. The subsidence and widening phase of the LT in the Ordovician and early Silurian coincides with, and was possibly governed by, the Avalonia collision with Baltica from the SW when high shear stress forced LeRPFZ blocks to move obliquely towards the NE. As Laurentia was approaching Baltica and finally collided with it in the mid-Silurian, the shear stress became progressively mingled with compression from the NW and the subsidence of the LeRPFZ became reversed, triggering LT withdrawal to the SW. Thus, being once the deep-water centre of the Baltic Ordovician–Silurian Basin, the LT became the most uplifted and intensely eroded EEC interior zone by the Devonian.


Afanasev, B. & Volkolakov, F. 1972. The main tectonic structures of the pre-Devonian Baltic Syneclise sedi­mentary cover complex. In Regional Geology of the Baltic Countries and Belarus (Ulst, R., ed.), pp. 121–128. Zinatne, Riga [in Russian, with English summary].

Afanasev, B. L., Polivko, I. A., Yakovleva, V. I. & Volkolakov, F. K. 1973. On the problem of genesis of the local structures of the Baltic area. In Issues in the Regional Geology of the Baltic Countries and Belorussia (Kuršs, V. M., ed.), pp. 201–210. Zinatne, Riga [in Russian, with English summary].

Ainsaar, L. 1995. Terrigeenne materjal veetaseme muutuste kajastajana Lõuna-Eesti Ordoviitsiumis [Terrigenous material as an indicator of sea-level changes in the Ordovician of South Estonia]. In Geology of Livonia (Meidla, T., Jõeleht, A., Kalm, V. & Kirs, J., eds), pp. 51–58. Tartu Ülikooli Kirjastus, Tartu [in Estonian, with English summary].

Amantov, A., Hagenfeldt, S. & Söderberg, P. 1995. The Mesoproterozoic to Lower Paleozoic sedimentary bedrock sequence in the Northern Baltic Proper, Åland Sea, Gulf of Finland and Lake Ladoga. In Proceedings of the Third Marine Geological Conference “The Baltic” (Mojski, J. E., ed.), Prace Panstwowego Instytutu Geologicznego149, 19–25.

Ankudinov, S., Sadov, A. & Brio, H. 1994. Crustal structure of Baltic countries on the basis of deep seismic sounding data. Proceedings of the Estonian Academy of Sciences, Geology43, 129–136 [in Russian, with English summary].

Bassett, M. G., Kaljo, D. & Teller, L. 1989. The Baltic region. In A Global Standard for the Silurian System (Holland, C. H. & Bassett, M. G., eds), pp. 158–170. National Museum of Wales, Geological Series 9.

Bogdanova, S. V., Bingen, B., Gorbatschev, R., Kheraskova, T. N., Kozlov, V. I., Puchkov, V. N. & Volozh, Yu. A. 2008. The East European Craton (Baltica) before and during the assembly of Rodinia. Precambrian Research160, 23–45.

Brangulis, A. 1985. Vend i Kembrij Latvii [The Vendian and Cambrian in Latvia]. Zinatne, Riga, 134 pp. [in Russian].

Brangulis, A. P. & Brio, H. S. 1981. Istoriya razvitiya osnovnykh lokal´nykh podnyatij Zapadnoj i Tsentral´noj Latvii [History of the development of the local uplifts in western and central Latvia]. In Usloviya obrazovaniya osadochnogo chekhla i struktur Pribaltiki [Conditions in the Formation of the Platform Cover and Its Structures in the Baltic Countries] (Afanasev, B. L., ed.), pp. 25–33. Zinatne, Riga [in Russian].

Brenchley, P. J., Carden, G. A., Hints, L., Kaljo, D., Marshall, J. D., Martma, T., Meidla, T. & Nõlvak, J. 2003. High-resolution stable isotope stratigraphy of Upper Ordovician sequences: Constraints on the timing of bioevents and environmental changes associated with mass extinction and glaciation. Geological Society of America Bulletin115, 89–104.<0089:HRSISO>2.0.CO;2

Brio, H. S., Kucherenko, V. P. & Kursheva, V. F. 1981. Novye dannye o strukturnom plane kaledonskogo etazha v rajone Valmierskogo podnyatiya [New data on the structural setting of the Caledonian structural complex around the Valmiera Uplift]. In Usloviya obrazovaniya osadochnogo chekhla i struktur Pribaltiki [Conditions of the Formation of the Platform Cover and Its Structures in the Baltic Countries] (Afanasev, B. L., ed.), pp. 67–71. Zinatne, Riga [in Russian].

Einasto, R. 1986. Main stages of development and facies models of the East Baltic Silurian pericontinental basin. In Teoriya i opyt ékostratigrafii [Theory and Practice of Ecostratigraphy] (Kaljo, D. & Klaamann, E., eds), pp. 37–54. Valgus, Tallinn [in Russian].

Einasto, R. 1995. “Liivi keele” omapärast Baltika arenguloos [On the role of the Livonian Tongue in the evolution of the Baltic continent]. In Geology of Livonia (Meidla, T., Jõeleht, A., Kalm, V. & Kirs, J., eds), pp. 23–32. Tartu Ülikooli Kirjastus, Tartu [in Estonian, with English summary].

Elo, S. & Korja, A. 1993. Geophysical interpretation of the crustal and upper mantel structure in the Wiborg rapakivi granite area, southeastern Finland. Precambrian Research64, 273–288.

Flodén, T. 1980. Seismic stratigraphy and bedrock geology of the central Baltic. Stockholm Contributions in Geology35, 1–240.

Gaál, G. & Gorbatschev, R. 1987. An Outline of the Precambrian evolution of the Baltic Shield. Precambrian Research35, 15–52.

Garetski, R. G., Brangulis, A. P., Gorelik, Z. A., Puura, V. A. & Suveizdis, P. I. (eds). 1978. Tektonicheskaya terminologiya Belorussii i Pribaltiki [Tectonic Terminology of Belarus and Baltic Countries]. Nauka i Tekhnika, Minsk, 268 pp. [in Russian].

Gee, D. G. & Pease, V. (eds). 2004. Timanides – Neoproterozoic Orogeny along the eastern margin of Baltica. Geological Society, London, Memoirs30, 1–249.

Gee, D. G., Fossen, H., Henriksen, N. & Higgins, A. K. 2008. From the Early Paleozoic Platforms of Baltica and Laurentia to the Caledonide Orogen of Scandinavia and Greenland. Episodes31, 44–51.

Gorbatschev, R. & Bogdanova, S. 1993. Frontiers in the Baltic Shield. Precambrian Research64, 3–22.

Grahn, Y. 1982. Caradocian and Ashgillian Chitinozoa from the subsurface of Gotland. Sveriges Geologiska UndersökningC788, 1–66.

Grahn, Y. 1995. Lower Silurian Chitinozoa and biostratigraphy of subsurface Gotland. Geologiska Föreningens i Stockholm Förhandlingar117, 57–65.

Grahn, Y. & Nõlvak, J. 2010. Swedish Ordovician Chitinozoa and biostratigraphy: a review and new data. Palaeontographica Abteilung B: Palaeobotany – Palaeophytology283, 1–71.

Hagenfeldt, S. E. 1989. Lower and Middle Cambrian Acritarchs from the Baltic Depression and South-Central Sweden, Taxonomy, Stratigraphy, and Palaeogeographic Reconstruction. Ph.D. thesis, Department of Geology, University of Stockholm, Sweden, 32 pp.

Harris, M. T., Sheehan, P. M., Ainsaar, L., Hints, L., Männik, P., Nõlvak, J. & Rubel, M. 2004. Upper Ordovician sequences of western Estonia. Palaeogeography, Palaeoclimatology, Palaeoecology210, 135–148.

Jaanusson, V. 1973. Aspects of carbonate sedimentation in the Ordovician of Baltoscandia. Lethaia6, 11–34.

Jaanusson, V. 1976. Faunal dynamics in the Middle Ordovician (Viruan) of BaltoScandia. In The Ordovician System. Proceedings of a Paleontological Association, Symposium, Birmingham, September 1974 (Bassett, M. G., ed.), pp. 301–326. University of Wales Press and National Museum of Wales, Cardiff.

Janutyte, I., Majdanski, M., Voss, P. H. & Kozlovskaya, E. 2015. Upper mantle structure around the Trans-European Suture Zone obtained by teleseismic tomography. Solid Earth6, 73–91.

Kaljo, D. (ed.). 1970. Silur Éstonii [The Silurian of Estonia]. Valgus, Tallinn, 343 pp. [in Russian, with English summary].

Kaljo, D. (ed.). 1977. Fatsii i fauna Silura Pribaltiki [Facies and Fauna of the Baltic Silurian]. Academy of Sciences of the Estonian SSR, Tallinn, 286 pp. [in Russian, with English summary].

Kaljo, D. & Jürgenson, E. 1977. Fatsial´naya zonal´nost´ Silura Pribaltiki [Sedimentary facies of the East Baltic Silurian]. In Fatsii i fauna Silura Pribaltiki [Facies and Fauna of the Baltic Silurian] (Kaljo, D., ed.), pp. 122–148. Academy of Sciences of the Estonian SSR, Tallinn [in Russian, with English abstract].

Kaljo, D. & Hints, L. 1996. Late Ordovician–Early Silurian succession of palaeoecosystems in Estonia. Pale­ontological Journal30, 693–700.

Kaljo, D., Nestor, H. & Põlma, L. 1988. East Baltic region. In A Global Analysis of the Ordovician–Silurian Boundary (Cocks, L. R. M. & Rickards, R. B., eds), Bulletin of the British Museum (Natural History), Geology43, 85–91.

Kaljo, D., Nestor, H., Põlma, L. & Einasto, R. 1991. Pozdneordovikskoe olednenie i ego otrazhenie v osadkonakoplenii Paleobaltijskogo bassejna [Late Ordovician glaciation and its reflection in sediment accumulation of the Paleobaltic basin]. In Vazhneishie bioticheskie sobytiya v istorii zemli [Major Biological Events in Earth History] (Kaljo, D., Modzalevskaya, T. & Bogdanova, T., eds), pp. 66–78. Tallinn [in Russian].

Kaljo, D., Hints, L., Martma, T., Nõlvak, J. & Oraspõld, A. 2004. Late Ordovician carbon isotope trend in Estonia, its significance in stratigraphy and environmental analysis. Palaeogeography, Palaeoclimatology, Palaeoecology210, 165–185.

Kaljo, D., Martma, T. & Saadre, T. 2007. Post-Hunnebergian Ordovician carbon isotope trend in Baltoscandia, its environmental implications and some similarities with that of Nevada. Palaeogeography, Palaeoclimatology, Palaeoecology245, 138–155.

Kaljo, D., Hints, L., Männik, P. & Nõlvak, J. 2008. The succession of Hirnantian events based on data from Baltica: brachiopods, chitinozoans, conodonts, and carbon isotopes. Estonian Journal of Earth Sciences57, 197–218.

Kirs, J., Puura, V., Soesoo, A., Klein, V., Konsa, M., Koppelmaa, H., Niin, M. & Urtson, K. 2009. The crystalline basement of Estonia: rock complexes of the Palaeoproterozoic Orosirian and Statherian and Mesoproterozoic Calymmian periods, and regional correlations. Estonian Journal of Earth Sciences58, 219–228.

Kleesment, A., Põlma, L. & Kajak, K. 1980. Contact between the Ordovician and Devonian in South-East Estonia. Proceedings of the Estonian Academy of Sciences, Geology1, 8–16 [in Russian, with English summary].

Laitakari, I., Rämö, T., Suominen, V., Niin, M., Stepanov, K. & Amantov, A. 1996. Subjotnian: Rapakivi granites and related rocks in the surroundings of the Gulf of Finland. Geological Survey of Finland, Special Paper21, 59–97.

Lazauskiene, J., Sliaupa, S., Brazauskas, A. & Musteikis, P. 2003. Sequence stratigraphy of the Baltic Silurian succession: tectonic control on the foreland infill. Geological Society, London, Special Publications208, 95–115.

Loydell, D. K., Kaljo, D. & Männik, P. 1998. Integrated biostratigraphy of the lower Silurian of the Ohesaare core, Saaremaa, Estonia. Geological Magazine135, 769–783.

Loydell, D. K., Männik, P. & Nestor, V. 2003. Integrated biostratigraphy of the lower Silurian of the Aizpute-41 core, Latvia. Geological Magazine140, 205–229.

Loydell, D. K., Nestor, V. & Männik, P. 2010. Integrated biostratigraphy of the lower Silurian of the Kolka-54 core, Latvia. Geological Magazine147, 253–280.

Lukševičs, E., Stinkulis, Ģ., Mūrnieks, A. & Popovs, K. 2012. Geological evolution of the Baltic Artesian Basin. In Highlights of Groundwater Research in the Baltic Artesian Basin (Dēliņa, A., Kalvāns, A., Saks, T., Bethers, U. & Vircavs, V., eds), pp. 7–52. University of Latvia, Riga.

Männik, P. 2014. The Silurian System in Estonia. In 4th Annual Meeting of IGCP 591, Estonia, 1019 June 2014, Abstracts and Field Guide (Bauert, H., Hints, O., Meidla, T. & Männik, P., eds), pp.123−128. University of Tartu, Tartu.

Männil, R. 1966. Istoriya razvitiya Baltijskogo bassejna v ordovike [Evolution of the Baltic Basin During the Ordovician]. Valgus, Tallinn, 200 pp. [in Russian, with English summary].

Martinsson, A. 1968. The Ordovician–Silurian hiatus below Gotland. Geologiska Föreningens i Stockholm Förhandlingar90, 561–563.

Meidla, T., Ainsaar, L. & Hints, O. 2014. The Ordovician System in Estonia. In 4th Annual Meeting of IGCP 591, The Early to Middle Paleozoic Revolution, Estonia, 1019 June 2014, Abstracts and Field Guide (Bauert, H., Hints, O., Meidla, T. & Männik, P., eds), pp. 116−122. University of Tartu, Tartu.

Mens, K. & Pirrus, E. 1997. Vendian–Tremadoc clastogenic sedimentation basins. In Geology and Mineral Resources of Estonia (Raukas, A. & Teedumäe, A., eds), pp. 184–192. Estonian Academy Publishers, Tallinn.

Misans, J. P. & Brangulis, A. P. (eds). 1979. Geologicheskoe stroenie i poleznye iskopaemye Latvii [Geology and Mineral Resources of Latvia]. Zinatne, Riga, 538 pp. [in Russian].

Modliński, Z., Jacyna, J., Kanev, S., Khubldikov, A., Laskova, L., Laskovas, J., Lendzion, K., Mikazane, I. & Pomeranceva, R. 1999. Palaeotectonic evolution of the Baltic Syneclise during the Early Palaeozoic as docu­mented by paleothickness maps. Geological Quarterly43, 285–296.

Nestor, H. & Einasto, R. 1977. Facies-sedimentary model of the Silurian Palaeobaltic Pericontinental Basin. In Fatsii i fauna Silura Pribaltiki [Facies and Fauna of the Baltic Silurian] (Kaljo, D., ed.), pp. 89–121. Academy of Sciences of the Estonian SSR, Tallinn [in Russian, with English abstract].

Nestor, H. & Einasto, R. 1997. Ordovician and Silurian carbonate sedimentary basin. In Geology and Mineral Resources of Estonia (Raukas, A. & Teedumäe, A., eds), pp. 192–195. Estonian Academy Publishers, Tallinn.

Nielsen, A. T. & Schovsbo, N. H. 2011. The Lower Cambrian of Scandinavia: Depositional environment, sequence stratigraphy and paleogeography. Earth-Science Reviews107, 207–310.

Nikishin, A. M., Ziegler, P. A., Stephenson, R. A., Cloetingh, S. A. P. L., Furne, A. V., Fokin, P. A., Ershov, A. V., Bolotov, S. N., Korotaev, M. V., Alekseev, A. S., Gorbachev, V. I., Shipilov, E. V., Lankreijer, A., Bembinova, E. Y. & Shalimov, I. V. 1996. Late Precambrian to Triassic history of the East European Craton: dynamics of sedimentary basin evolution. Tectonophysics268, 23–63.

Nironen, M. 1997. The Svecofennian Orogen: a tectonic model. Precambrian Research86, 21–44.

Nõlvak, J. 1987. Rakvere Stage. Nabala Stage. Vormsi Stage. Pirgu Stage. In Geology and Mineral Resources of the Rakvere Phosphorite-Bearing Area (Puura, V., ed.), pp. 63–69. Valgus, Tallinn [in Russian].

Paasikivi, L. B. 1966. Geologicheskoe stroenie i istoriya razvitiya Haanja-Loknovskogo i Mynisteskogo podnyatiya [Geology and development of the Haanja-Lokno and Mõniste uplifts]. Voprosy razvedochnoj geofiziki5, 86–97 [in Russian].

Paškevičius, J. 1997. The Geology of the Baltic Republics. Lietuvos Geologijos Tarnyba, Vilnius, 387 pp.

Pease, V., Daly, J. S., Elming, S.-Å., Kumpulainen, R., Moczydlowska, M., Puchkov, V., Roberts, D., Saintot, A. & Stephenson, R. 2008. Baltica in the Cryogenian, 850–630 Ma. Precambrian Research160, 46–65.

Perens, E. 1995. Ülemordoviitsiumist Põltsamaa–Jõgeva–Ruskavere joonel [Upper Ordovician sequence on the Põltsamaa–Jõgeva–Ruskavere line]. In Geology of Livonia (Meidla, T., Jõeleht, A., Kalm, V. & Kirs, J., eds), pp. 45–50. Tartu Ülikooli Kirjastus, Tartu [in Estonian, with English summary].

Põldsaar, K. & Ainsaar, L. 2014. Extensive soft-sediment deformation structures in the early Darriwilian (Middle Ordovician) shallow marine siliciclastic sediments formed on the Baltoscandian carbonate ramp, northwestern Estonia. Marine Geology356, 111–127.

Põldsaar, K., Ainsaar, L., Nemliher, R., Tinn, O. & Stinkulis, G. 2019. A siliciclastic shallow-marine turbidite on the carbonate shelf of the Ordovician Baltoscandian palaeo­basin. Estonian Journal of Earth Sciences68, 1–14.

Polivko, I. A. 1981. Kaledonskaya struktura Pribaltiki [Caledonian structure of the Baltic countries]. In Usloviya obrazovaniya osadochnogo chekhla i struktur Pribaltiki [Conditions of the Formation of the Platform Cover and Its Structures in the Baltic Countries] (Afanasev, B.-L., ed.), pp. 34–45. Zinatne, Riga [in Russian].

Puura, V. & Flodén, T. 1999. Rapakivi-granite–anorthosite magmatism – a way of thinning and stabilisation of the Svecofennian crust, Baltic Sea Basin. Tectonophysics305, 75–92.

Puura, V. & Tuuling, I. 1988. Geology of the Early Ordovician clastic dikes of Osmussaar. Proceedings of the Academy of Sciences of the Estonian SSR, Geology37, 1–9 [in Russian, with English summary].

Puura, V., Amantov, A., Sviridov, N. & Kanev, S. 1991. Tektonika [Tectonics]. In Geologiya and Geomorfologiya Baltijskogo morya [Geology and Geomorphology of the Baltic Sea] (Grigelis, A. A., ed.), pp. 267–290. Nedra, Leningrad [in Russian].

Puura, V., Amantov, A., Tikhomirov, V. & Laitakari, I. 1996. Latest events affecting the Precambrian basement, Gulf of Finland and surrounding areas. Geological Survey of FinlandSpecial Paper21, 115–125.

Schmidt, F. 1891. Einige Bemerkungen über das Baltische Obersilur in Veranlassung der Arbeit des Prof. W. Dames über die Schichtenfolge der Silurbildung Gotlands. Mélanges géologiques et paléontologiques, Bulletin de l´Académie Impériale des Sciences de St. Pétersbourg1(1), 119–138.

Šliaupa, S. & Hoth, P. 2011. Geological evolution and resources of the Baltic Sea area from the Precambrian to the Quaternary. In The Baltic Sea Basin (Harff, J., Björck, S. & Hoth, P., eds), pp.13–53. Springer-Verlag, Berlin, Heidelberg.

Šliaupa, S., Fokin, P., Lazauskienė, J. & Stephenson, R. 2006. The Vendian–Early Palaeozoic sedimentary basins of the East European Craton. In European Lithosphere Dynamics (Gee, D. G. & Stephenson, R. A., eds), Geological Society, London, Memoirs32, 449–462.

Söderberg, P. 1993. Seismic stratigraphy, tectonics and gas migration in the Åland Sea, northern Baltic Proper. Stockholm Contributions in Geology43, 1–67.

Torsvik, T. H. & Cocks, L. R. M. 2013. New global palaeo-geographical reconstructions for the Early Palaeozoic and their generation. In Early Palaeozoic Biogeography and Palaeogeography (Harper, D. A. T. & Servais, T., eds), Geological Society, London, Memoirs38, 5–24.

Tuuling, I. 2017. Paleozoic rocks structure versus Cenozoic cuesta relief along the Baltic Shield–East European Platform transect. Geological Quartely, 61, 396–412.

Tuuling, I. 2019. The Leba Ridge–Riga–Pskov Fault Zone – a major East European Craton interior dislocation zone and its role in the early Palaeozoic development of the platform cover. Estonian Journal of Earth Sciences68, 161–189.

Tuuling, I. & Flodén, T. 2000: Late Ordovician carbonate buildups and erosional features north-east of Gotland, northern Baltic Sea. Geologiska Föreningens i Stockholm Förhandlingar122, 237–249.

Tuuling, I. & Flodén, T. 2007. The Ordovician–Silurian boundary beds between Saaremaa and Gotland, Baltic Sea, based on high resolution seismic data. Geological Quarterly51, 217–229.

Tuuling, I. & Flodén, T. 2009a. The Llandovery–lowermost Wenlock sequence in the Baltic Sea between Saaremaa and Gotland; subdivision, thicknesses and correlation, based on marine seismic studies. Marine Geology267, 55–70.

Tuuling, I. & Flodén, T. 2009b. Seismic correlation of Palaeozoic rocks across the northern Baltic Proper – Swedish–Estonian project since 1990, a review. Estonian Journal of Earth Sciences58, 73–85.

Tuuling, I. & Flodén, T. 2011. Seismic stratigraphy, architecture and outcrop pattern of the Wenlock–Přidoli sequence offshore Saaremaa, Baltic Sea. Marine Geology281, 14–26.

Tuuling, I. & Vaher, R. 2018. Structure and development of the Valmiera–Lokno Uplift – a highly elevated basement block with a strongly deformed and eroded platform cover in the East European Craton interior around the Estonian–Latvian–Russian borderland. Geological Quarterly62, 579–596.

Ulst, R., Gailite, L. & Yakovleva, V. 1982. Ordovik Latvii [The Ordovician of Latvia]. Zinatne, Riga, 294 pp. [in Russian].

Vejelyte, I., Bogdanova, S., Salnikova, E., Yakovleva, S. & Fedoseenko, A. 2010. Timing of ductile shearing within the Drūkšiai–Polotsk Deformation Zone, Lithuania: a U–Pb titanite age. Estonian Journal of Earth Sciences59, 256–262.

Viola, G., Henderson, I. H. C., Bingen, B. & Hendriks, B. W. H. 2011. The Grenvillian–Sveconorwegian orogeny in Fennoscandia: Back‐thrusting and extensional shearing along the “Mylonite Zone”. Precambrian Research189, 368–388.

Volkolakov, F. K. 1974. Strukturnaya pozitsiya podnyatiya Liepaja-more v Baltijskoj Sineklize [Structural setting of the submarine uplift off Liepaja in the Baltic Syneclise]. In Regional´naya geologiya Pribaltiki [Regional Geology of the Baltic Countries] (Sorokin, V. S., ed.), pp. 145–148. Zinatne, Riga [in Russian]. 

Wannäs, K. O. 1989. Seismic stratigraphy and tectonic de­velopment of the Upper Proterozoic to Lower Paleozoic of the Bothnian Bay, Baltic Sea. Stockholm Contributions in Geology40, 83–168.

Winterhalter, B., Flodén, T., Ignatius, H. & Axberg, S. 1981. Geology of the Baltic SeaIn The Baltic Sea, Elsevier Oceanography Series (Voipio, A., ed.), pp. 1–117. Elsevier Scientific Company, Amsterdam.

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