Penokee Gap, Bad River, Ashland Co., Wisconsin, USA
|Latitude & Longitude (WGS84):||46° 17' 46'' North , 90° 42' 21'' West|
|Latitude & Longitude (decimal):||46.29623,-90.70601|
4 valid minerals.
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; Ironwood Iron-formation|
Age: Proterozoic (1600 - 2500 Ma)
Stratigraphic Name: Ironwood Iron Formation
Description: Interbedded cherty and slaty iron-formation. Locally, secondary enrichment has formed "soft ore" bodies. In eastern part of Gogebic Range, Ironwood Iron-formation is intercalated with pyroclastic rocks of Emperor Volcanic Complex, and in eastern half of T. 47 N., R. 43 W. (where mapped within unit Xip) consists entirely of black slate
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.