Ep-Archean and Ep-Algonkian intervals in Western North Americ

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• 责任者：Hinds ; N. E. A.
• 责任方式：Written
• 出版者：s. n.
• 出版年：1935
• 出版地：S. l.
• 出版日期：1935/1/1 0:00:00
• 分类号：511
• 语言：English

摘要

Three years ago I was invited by Dr. J. C. Merriam of the Carnegie Institution of Washington to study the Algonkian strata exposed in the Grand Canyon. Two field seasons have already been spent on the ground long ago pioneered by Powell, Dutton and Walcott-mostly in that little known eastern area of the Canyon where Walcott estab-lished a two-fold division of the Algonkian into the lower Unkar and upper Chuar groups.