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.)

---

Home page