mesoproterozoic

Copper sheet (Mesoproterozoic, 1.05-1.06 Ga; White Pine Mine, Ontonagon County, Upper Peninsula of Michigan, USA) 3
by James St. John

Nelsonite (Laramie Anorthosite Complex, Mesoproterozoic, 1.43 Ga; Sybille Pit, Laramie Range, Wyoming, USA) 18
by James St. John

Talcite (talcose rock) (Allamoore Formation, Mesoproterozoic, 1.25 Ga; Bridges Talc Mine, Trans-Pecos Mountains, Texas, USA)
by James St. John

Columnar-jointed rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Palisade Head, northeastern Minnesota, USA) 1
by James St. John

Copper skull (Mesoproterozoic, 1.05-1.06 Ga; Calumet and Hecla Mine, Calumet, Michigan, USA) 3
by James St. John

Copper crystal in copper mass (Mesoproterozoic, 1.05-1.06 Ga; Ahmeek, Upper Peninsula of Michigan, USA) 3
by James St. John

Verde Bamboo Granite (epidotic metasandstone) (Ipuçaba Formation, Mesoproterozoic, 1.6-1.7 Ga; Bahia, Brazil) 1
by James St. John

Copper crystals (Mesoproterozoic, 1.05-1.06 Ga; Quincy Mine, Hancock, Upper Peninsula of Michigan, USA) 1
by James St. John

Native copper-replaced cobble (Mesoproterozoic; Calumet and Hecla Mine, Calumet, Michigan, USA) 3
by James St. John

Silver (Mesoproterozoic, 1.05-1.06 Ga; Rockland, Ontonagon County, Upper Peninsula of Michigan, USA)
by James St. John

Moonstone (iridescent peristerite-oligoclase feldspar) (Chupa Pegmatite Field, Mesoproterozoic, 1.75 to 2.10 Ga; at or near Chupa Bay, Karelia, Russia) 2
by James St. John

Copper skull (Mesoproterozoic, 1.05-1.06 Ga; Centennial Mine, Upper Peninsula of Michigan, USA)
by James St. John

Silver (Mesoproterozoic, 1.05-1.06 Ga; copper mine near Houghton, Michigan, USA) 3
by James St. John

Copper sheet (Mesoproterozoic, 1.05-1.06 Ga; White Pine Mine, Ontonagon County, Upper Peninsula of Michigan, USA) 1
by James St. John

Copper crystals (Mesoproterozoic, 1.05-1.06 Ga; Quincy Mine, Hancock, Upper Peninsula of Michigan, USA) 6
by James St. John

Coarsely-crystalline porphyritic granite (Pikes Peak Batholith (pgpm2 facies), Mesoproterozoic, 1.08 Ga; a little east of summit house atop Pikes Peak, central Colorado, USA) 1
by James St. John

Native copper-replaced cross-bedded sedimentary rocks (Nonesuch Shale, Mesoproterozoic; White Pine Mine, Upper Peninsula of Michigan, USA) 3
by James St. John

Copper (Mesoproterozoic, 1.05-1.06 Ga; White Pine Mine, Ontonagon County, Michigan, USA) 2
by James St. John

Copper crystals with cuprite coating (Mesoproterozoic, 1.05-1.06 Ga; Kearsarge Mine, Kearsarge, Michigan, USA)
by James St. John

Silver (Mesoproterozoic, 1.05-1.06 Ga; copper mine near Houghton, Michigan, USA) 2
by James St. John

Copper glacial boulder (Mesoproterozoic, 1.05-1.06 Ga; Pleistocene glacial deposit at Oglesby, Illinois, USA) 1
by James St. John

Gawler Range Porphyry (Mesoproterozoic, 1.59 Ga; Corunna Station, South Australia) 5
by James St. John

Grypania spiralis (Greyson Shale, Mesoproterozoic, 1454-1468 Ma; western flanks of the Big Belt Mountains, Montana, USA) 2
by James St. John

Sulfidic gabbro (nickel ore) (Voisey's Bay Ni-Cu-Co Magmatic Sulfide Deposit, Mesoproterozoic, 1.333 Ga; Voisey's Bay Mine, Labrador, Canada) 3
by James St. John

Silver (Mesoproterozoic, 1.05-1.06 Ga; Kearsarge Mine, Houghton County, Upper Peninsula of Michigan, USA) 1
by James St. John

Native copper-replaced cross-bedded sedimentary rocks (Nonesuch Shale, Mesoproterozoic; White Pine Mine, Upper Peninsula of Michigan, USA) 1
by James St. John

Marinace Green Granite (polymict metaconglomerate) (Ouricuri do Ouro Formation, Mesoproterozoic, ~1.6-1.7 Ga; Bahia, Brazil) 4
by James St. John

Copper crystal (Mesoproterozoic, 1.05-1.06 Ga; Quincy Mine, Hancock, Upper Peninsula of Michigan, USA) 3
by James St. John

Black Angola Granite (gabbro) (Kunene Complex, Mesoproterozoic, 1347-1371 Ma; Lubango, Angola) 3
by James St. John

Granulite ("Kashmir White Granite", ~1.4 Ga, Mesoproterozoic; Madurai District, Tamil Nadu State, Eastern Ghats Orogenic Belt, India)
by James St. John

Soapstone with manganese oxide dendrites (Mesoproterozoic, 1.1 to 1.3 Ga; near Ennis, Montana, USA) 1
by James St. John

Gouverneur Marble (Mesoproterozoic, ~1.1 Ga; Route 11 roadcut north of Antwerp, New York State, USA) 32
by James St. John

Anorthosite with granite dike (Laramie Anorthosite Complex, Mesoproterozoic, 1.43 Ga; Sybille Pit, Laramie Range, Wyoming, USA) 2
by James St. John

Cupriferous amygdaloidal basalt (Mesoproterozoic, 1.05-1.06 Ga; Wolverine Mine, Kearsarge, Upper Peninsula of Michigan, USA)
by James St. John

Native copper in sandstone (Nonesuch Formation, Mesoproterozoic; White Pine, Upper Peninsula of Michigan, USA) 2
by James St. John

Copper crystals (Mesoproterozoic, 1.05-1.06 Ga; Central Mine, Keweenaw County, Upper Peninsula of Michigan, USA) 1
by James St. John

Native copper vein (Mesoproterozoic, 1.05-1.06 Ga; Great Sand Bay, Keweenaw County, Upper Peninsula of Michigan, USA) 1
by James St. John

Banded fine-grained pyrite in shale (Urquhart Shale, Mesoproterozoic; Mt. Isa Mines, Queensland, Australia)
by James St. John

Copper skull (Mesoproterozoic, 1.05-1.06 Ga; Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 5
by James St. John

Kakortokite (eudialytic nepheline syenite) (Ilímaussaq Intrusion, Mesoproterozoic, 1.16 Ga; Kangerdluarssaq Fjord, Greenland) 4
by James St. John

Native copper-coated cobble (Mesoproterozoic; Calumet and Hecla Mine, Calumet, Michigan, USA) 1
by James St. John

Anorthosite (Poe Mountain Anorthosite, Mesoproterozoic, 1.43 Ga; Sybille Canyon, Laramie Range, Wyoming, USA) 8
by James St. John

End-Pleistocene pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 2
by James St. John

Copper glacial boulder (Mesoproterozoic, 1.05-1.06 Ga; Pleistocene glacial deposit at Oglesby, Illinois, USA) 2
by James St. John

Copper skull (Mesoproterozoic, 1.05-1.06 Ga; Calumet and Hecla Mine, Calumet, Michigan, USA) 6
by James St. John

Amygdaloidal basalt (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.093 to 1.097 Ga; Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 18
by James St. John

Copper crystals (Mesoproterozoic, 1.05-1.06 Ga; Franklin Jr. Mine, Hancock, Upper Peninsula of Michigan, USA)
by James St. John

Copper and silver (Mesoproterozoic, 1.05-.1.06 Ga; Isle Royale Number 3 Mine, Houghton County, northern Michigan, USA)
by James St. John

Epidotic vesicular basalt (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.093 to 1.097 Ga; Gratiot Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 3
by James St. John

"Missouri Red Granite" (Graniteville Granite, Mesoproterozoic, 1.317 Ga; St. Francois Mountains, Missouri, USA)
by James St. John

Impact breccia (Cretaceous-Tertiary boundary, 65 Ma; Boltysh Impact Structure, Ukraine) 2
by James St. John

Copper crystal (Mesoproterozoic, 1.05-1.06 Ga; Calumet and Hecla Mine, Calumet, Upper Peninsula of Michigan, USA)
by James St. John

Marinace Green Granite (polymict metaconglomerate) (Ouricuri do Ouro Formation, Mesoproterozoic, ~1.6-1.7 Ga; Bahia, Brazil) 8
by James St. John

Nara Brown Granite (charnockite/farsundite/quartz mangerite) (Riviere-a-Pierre Plutonic Suite, Mesoproterozoic, ~1.1 Ga; north of Riviere-a-Pierre, Quebec, Canada)
by James St. John

Copper (Mesoproterozoic, 1.05-1.06 Ga; copper mine in the Upper Peninsula of Michigan, USA) 2
by James St. John

Native copper (Mesoproterozoic, 1.05-1.06 Ga; Keweenaw Peninsula area, Upper Peninsula of Michigan, USA) 12
by James St. John

Mudcracks in argillite (Grinnell Formation, Mesoproterozoic, ~1.45 Ga; Glacier National Park, Montana, USA) 5
by James St. John

Native copper from intraclast conglomerate matrix (Mesoproterozoic, 1.05-1.06 Ga; Conglomerate Lode, Centennial Mine, Houghton County, Michigan, USA) 2
by James St. John

Silver (Mesoproterozoic, 1.05-1.06 Ga; Michigan Mine, Ontonagon County, Upper Peninsula of Michigan, USA)
by James St. John

Marinace Green Granite (polymict metaconglomerate) (Ouricuri do Ouro Formation, Mesoproterozoic, ~1.6-1.7 Ga; Bahia, Brazil) 9
by James St. John