SOME  GEOLOGY  IN  MICHIGAN’S  UPPER  PENINSULA  (UP)

 

Mackinac Breccia (Devonian) - Castle Rock Lakestack

 


 

Munising Formation (Cambrian) - Pictured Rocks

 


 

Jacobsville Sandstone (~1.03-1.07 b.y.)

 


 

Oronto Group

     Freda Sandstone (~1.07-1.08 b.y.)

     Nonesuch Shale (~1.07-1.08 b.y.) - Presque Isle River

     Lake Shore Traps (1.087 b.y.)

     Copper Harbor Conglomerate (1.085-1.093 b.y.)

 


 

Portage Lake Volcanic Series (1.093-1.097 b.y.)

(plus photos and info. about the Allouez Conglomerate & the Calumet and Hecla Conglomerate, 1.094-1.095 b.y.)

 


 

Michigamme Formation (~1.85-1.86 b.y.)

 


 

Menominee Group

    Negaunee Iron-Formation (2.11 b.y.) - Jasper Knob &

                                          Champion Specularites &

                                    Michigamme Mine

    Siamo Slate & Ajibik Quartzite (2.1-2.2 b.y.)

 


 

Chocolay Group (2.20-2.29 b.y.)

 


 

Basement Rocks

   Deer Lake Peridotite (~2.5-2.7 b.y.)

   Compeau Creek Gneiss (?~2.6-3.0 b.y.)

   Kitchi Formation (?~2.7 b.y.)

   Mona Formation (?~2.7 b.y.)

 


 

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