Earth:Hogland Series
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Gogland
Location of Gogland within the Baltic Sea.
The Hogland Series are a series of Subjotnian sedimentary rocks exposed in the island of Gogland (Swedish: Hogland), the Sommer Islands and the nearby sea bottom in the Gulf of Finland. The series encompass quartz-rich conglomerates and breccias plus some volcanic rocks of mafic composition in the form of lava flows and some more silica-rich igneous rocks including quartz-porphyry. The porphyries, which lie at the top the pile, share their origin with the rapakivi granites found nearby.[1] An exhumed Subjotnian erosion surface is exposed on the island.[2]
References
- ↑ Amantov, Alexey; Hagenfeldt, Stefan; Söderberg, Per (1995). "The Mesoporterozoic to Lower Palaeozoic sedimentary bedrock sequence in the northern Baltic Proper, Åland Sea, Gulf of Finland and Lake Ladoga". pp. 19–25.
- ↑ Laitakari, I.; Rämö, T.; Suominen, V.; Niin, M.; Stepanov, K.; Amantov, A. (1996). "Subjotnian: Rapakivi granites and related rocks in the Gulf of Finland". Geological Survey of Finland, Special Paper 21: 59–97. https://www.researchgate.net/publication/259467722. Retrieved 27 July 2015.
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