|Latitude & Longitude (WGS84):||46° 26' North , 87° 35' West|
|Latitude & Longitude (decimal):||46.43333,-87.58333|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
An opencast iron mine with an 8.1 million tons/yr capacity. Owned by the Cleveland Cliffs Iron Co. (1985), then operated by the Empire Iron Mining Co. (1988).
23 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
1600 - 2500 Ma
|Menominee Group; Negaunee Iron-formation|
Age: Proterozoic (1600 - 2500 Ma)
Stratigraphic Name: Negaunee Iron Formation
Description: Highly metamorphosed banded iron-formation. Principal iron-formation in Marquette trough and nearby areas. Includes abundant metadiabase sills.
Comments: Continental margin assemblage (north of Niagara Fault)
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. 
3200 - 3600 Ma
|Archean crystalline metamorphic rocks|
Age: Paleoarchean (3200 - 3600 Ma)
Comments: Superior Province
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529.