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Abstract
Details of the stratigraphic section in parts of northern Michigan have been known for many years, but correlation of units between geographically separated areas has been partly speculative. Mapping in the Witch Lake quadrangle has filled the gap between well-studied areas of the Marquette trough and parts of Iron and Dickinson Counties and has helped to correlate units in the Baraga Group (Precambrian X). Iron-formations are important marker beds; because of their magnetic properties they can be traced with certainty through poorly exposed areas. The magnetic Fence River Formation is now known to be stratigraphically beneath the Bijiki Iron-formation Member of the Michigamme Formation but may be equivalent to the Greenwood Iron-formation Member which crops out in parts of the Marquette trough to the east The Hemlock Formation (volcanic) underlies the Fence River and has been traced from near its type locality in Iron County to the south flank of the Marquette trough. These relationships provide the key to understanding the lateral facies changes responsible for the stratigraphic complexities of the Baraga Group.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Stratigraphic relationships within the Baraga Group of Precambrian age, central Upper Peninsula, Michigan |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 3 |
| Issue | 1 |
| Year Published | 1974 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 5 p. |
| First page | 47 |
| Last page | 51 |
| Country | United States |
| State | Michigan |
| Other Geospatial | central Upper Peninsula |
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