Selected papers on precambrian iron deposits.

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• 责任者：Unknown
• 责任方式：Unknown
• 出版者：S. n.
• 出版年：1900
• 出版地：S. L.
• 出版日期：1900/1/1 0:00:00
• 分类号：421.108
• 语言：English

摘要

The Dunka River area is at the eastern end of Minesota’s Mesabi range where the Middle Precanbrian Biwabik Iron Formation lies unconformably on Early Precambrian granitic rocks and is overlain conformably by the Middle Precanibrian Virginia Forma-tion.