Bedrock geologic map of the Greenwood quadrangle, Marquette County, Michigan
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- More information: National Geologic Map Database Index Page (html)
- Document: Report (659 pdf)
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Abstract
The Marquette Iron Range is presently ( 1973) the second largest iron mining district in the United States. Commercial iron deposits, now mostly concentrating-grade ore, are in the Negaunee Iron-formation, which is part of a thick sequence of metasedimentary rocks of Precambrian X age. These rocks are preserved in the west-trending Marquette synclinorium, and are flanked to the north and south by older Precambrian W crystalline rocks (fig. 1). The Greenwood quadrangle includes part of· the central Marquette Range and part of the Precambrian W rocks south of the range. No mines are active in the quadrangle, but appreciable quantities of iron-formation may be future concentrating-grade iron ore reserves.
Suggested Citation
Cannon, W.F., 1974, Bedrock geologic map of the Greenwood quadrangle, Marquette County, Michigan: U.S. Geological Survey Geologic Quadrangle 1168, Document: 8 p.; HTML Map, https://doi.org/10.3133/gq1168.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Bedrock geologic map of the Greenwood quadrangle, Marquette County, Michigan |
| Series title | Geologic Quadrangle |
| Series number | 1168 |
| DOI | 10.3133/gq1168 |
| Year Published | 1974 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Michigan Water Science Center |
| Description | Document: 8 p.; HTML Map |
| Country | United States |
| State | Michigan |
| County | Marquette County |
| Scale | 24000 |