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Bedrock geologic map of the Greenwood quadrangle, Marquette County, Michigan

Geologic Quadrangle 1168

Prepared in cooperation with the Geological Survey Division of the Michigan Department of Natural Resources
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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.

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Additional publication details

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
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