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Author
Series
Contributions to Precambrian geology of Lake Superior region volume ch. Q
U.S. Geological Survey bulletin volume 1904-Q
U.S. Geological Survey bulletin volume 1904-Q
Pub. Date
1993
Language
English
Formats
Author
Series
Contributions to Precambrian geology of Lake Superior region volume ch. U
U.S. Geological Survey bulletin volume 1904-U
U.S. Geological Survey bulletin volume 1904-U
Pub. Date
1995
Language
English
Formats
Description
Sm-Nd survey of Precambrian granitic and metasedimentary rocks collected from several geophysically defined blocks in central Minnesota confirms the presence of some fundamental geologic boundaries previously mapped on the basis of structure. The Malmo discontinuity an Early Proterozoic structure separates the Archean Minnesota River Valley ter- ranes from an Early Proterozoic (Penokean magmatic) terrane and the McGrath Gneiss dome of east-central...
5) Archean and early Proterozoic tectonic framework of North-Central United States and adjacent Canada
Author
Series
Contributions to Precambrian geology of Lake Superior region volume ch. T
U.S. Geological Survey bulletin volume 1904-T
U.S. Geological Survey bulletin volume 1904-T
Pub. Date
1995
Language
English
Formats
Author
Series
U.S. Geological Survey bulletin volume 1989-E
Strategic and critical minerals in the midcontinent region United States volume ch. E
Strategic and critical minerals in the midcontinent region United States volume ch. E
Pub. Date
1993.
Language
English
Formats
Author
Series
U.S. Geological Survey professional paper volume 1309
Pub. Date
1984
Language
English
Formats