{{Location map+|Baltic Sea|relief=1|float=right|width=300|caption=Location of Gogland within the Baltic Sea.|places= <!-- North-East--> {{Location map~|Baltic Sea|lat=60.05 |long=26.98 |label=Gogland|position=bottom|mark=Red pog.svg}} }} The '''Hogland Series''' are a series of Subjotnian sedimentary rocks exposed on the island of Gogland ({{langx|sv|Hogland}}), the Sommer Islands and the nearby sea floor in the Gulf of Finland. The series encompass quartz-rich conglomerates and breccias, as well as 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 located nearby.<ref name=Amantovetal1995>{{cite conference |title=The Mesoporterozoic to Lower Palaeozoic sedimentary bedrock sequence in the northern Baltic Proper, Åland Sea, Gulf of Finland and Lake Ladoga |last1=Amantov |first1=Alexey |last2=Hagenfeldt |first2=Stefan |last3=Söderberg |first3=Per |date=1995 |book-title=Proceedings of the Third Marine Geological Conference “The Baltic” |pages=19–25 }}</ref> An exhumed Subjotnian erosion surface is exposed on the island.<ref name=Laitakari>{{cite journal |last1=Laitakari |first1=I. |last2=Rämö |first2=T. |last3=Suominen |first3=V. |last4=Niin |first4=M.|last5=Stepanov |first5=K.|last6=Amantov |first6=A.|date=1996 |title=Subjotnian: Rapakivi granites and related rocks in the Gulf of Finland |url= https://www.researchgate.net/publication/259467722|journal=Geological Survey of Finland, Special Paper |volume=21 |pages=59–97 |access-date=27 July 2015}}</ref>
==References== {{reflist}}
{{coord missing|Russia}}
Category:Geology of European Russia Category:Mesoproterozoic Category:Stratigraphy of Europe
{{geology-stub}} {{Russia-geo-stub}}