Category:Trommald Formation

Media in category "Trommald Formation"

The following 4 files are in this category, out of 4 total.

• 
  Banded iron formation (Trommald Formation, Paleoproterozoic, ~1.87 Ga; Portsmouth Mine, Cuyuna North Range, Minnesota, USA) 1 (50538547858).jpg 3,444 × 1,511; 4.09 MB
  
• 
  Banded iron formation (Trommald Formation, Paleoproterozoic, ~1.87 Ga; Portsmouth Mine, Cuyuna North Range, Minnesota, USA) 2 (50539417332).jpg 3,843 × 1,521; 4.85 MB
  
• 
  Banded iron formation (Trommald Formation, Paleoproterozoic, ~1.87 Ga; Portsmouth Mine, Cuyuna North Range, Minnesota, USA) 3 (50539271381).jpg 1,780 × 1,689; 2.53 MB
  
• 
  Cuyuna Iron Range general geology.PNG 663 × 462; 30 KB