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Hogland Series : ウィキペディア英語版 | Hogland Series
The Hogland Series are a series of Subjotnian sedimentary rocks exposed in the island of Gogland ((スウェーデン語: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. An exhumed Subjotnian erosion surface is exposed on the island. ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Hogland Series」の詳細全文を読む
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