mesoproterozoic
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End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Lily Pond Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 4
by James St. John
by James St. John
サイズ変更など
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Lily Pond Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 3
by James St. John
by James St. John
Cupriferous amygdaloidal basalt (Kearsarge Flow, Portage Lake Volcanic Series, upper Mesoproterozoic, 1.095 Ga; South Kearsarge Mine, Upper Peninsula of Michigan, USA) 2
by James St. John
by James St. John
Copper and calcite (Mesoproterozoic, 1.05-1.06 Ga; Pewabic Lode, Upper Peninsula of Michigan, USA) 2
by James St. John
by James St. John
Cupriferous fractured basalt (Knowlton Flow, Portage Lake Volcanic Series, upper Mesoproterozoic, ~1.096 Ga; Caledonia Mine, Upper Peninsula of Michigan, USA)
by James St. John
by James St. John
Tugtupite in alkaline syenite after UV exposure (Ilímaussaq Complex, Mesoproterozoic, 1.16 Ga; Taseq Slope, Greenland) 3
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 7
by James St. John
by James St. John
Baptism River Basalt (North Shore Volcanic Group, Mesoproterozoic, ~1097 Ma; Split Rock Lighthouse, Minnesota, USA) 1
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Lily Pond Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 8
by James St. John
by James St. John
Anorthosite (Laramie Anorthosite Complex, Mesoproterozoic, 1.43 Ga; Sybille Canyon, Laramie Range, Wyoming, USA) 3
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 13
by James St. John
by James St. John
Rhyolite (Palisade Rhyolite, North Shore Volcanic Group, Mesoproterozoic, 1096-1097 Ma; Rt. 1 roadcut just north of Ilgen City, Minnesota, USA) 1
by James St. John
by James St. John
Non-vesicular basalt flow over rubbly-topped vesicular basalt flow (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.094 to 1.095 Ga; Rt. 41 roadcut west of the Delaware Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 7
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 7
by James St. John
by James St. John
Copper with silver (Mesoproterozoic, 1.05-1.06 Ga; Knowlton Lode, Caledonia Mine, Ontonagon County, Michigan, USA) 3
by James St. John
by James St. John
Silver Plume Granite (Mesoproterozoic, 1.42 Ga; Rocky Mountains National Park, USA) 1
by James St. John
by James St. John
Zinciferous marble fluorescing (Franklin Marble, Mesoproterozoic, 1.03-1.08 Ga; zinc mine in Franklin, northern New Jersey, USA) 4
by James St. John
by James St. John
Nelsonite (Laramie Anorthosite Complex, Mesoproterozoic, 1.43 Ga; Sybille Pit, Laramie Range, Wyoming, USA) 5
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 6
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Lily Pond Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 6
by James St. John
by James St. John
Non-vesicular basalt flow over rubbly-topped vesicular basalt flow (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.094 to 1.095 Ga; Rt. 41 roadcut west of the Delaware Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 1
by James St. John
by James St. John
Silver (Mesoproterozoic, 1.05-1.06 Ga; Osceola Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 2
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 3
by James St. John
by James St. John
Lakeshore beach gravel (upper Holocene; derived from the North Shore Volcanic Series, Mesoproterozoic, 1.1 Ga; Burlington Bay, Two Harbors, Minnesota, USA) 5
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 2
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 10
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Lily Pond Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 7
by James St. John
by James St. John
Epidote-lined vug in basalt (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.093 to 1.097 Ga; Centennial Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 3
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 12
by James St. John
by James St. John
Copper and calcite (Mesoproterozoic, 1.05-1.06 Ga; Pewabic Lode, Upper Peninsula of Michigan, USA) 1
by James St. John
by James St. John
Stromatolites in limestone (Helena Formation (a.k.a. Siyeh Formation), Belt Supergroup, Mesoproterozoic, about 1.45 Ga; Going-to-the-Sun Highway, Glacier National Park, Montana, USA) 1
by James St. John
by James St. John
Stromatolites (Snowslip Formation, Belt Supergroup, Mesoproterozoic, 1.44 Ga; Glacier National Park, Montana, USA) 1
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 11
by James St. John
by James St. John
Labradorite plagioclase feldspar (Nain Anorthosite, Mesoproterozoic, 1.29-1.35 Ga; Nain, Labrador, Canada) 6
by James St. John
by James St. John
Fault in the Allouez Conglomerate (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.094 Ga; Delaware Copper Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA)
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 6
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 9
by James St. John
by James St. John
Large anorthosite xenolith in ophitic ilmenite gabbro (anorthosite series, Duluth Complex, Mesoproterozoic, 1099 Ma; Keene Creek East Skyline Parkway roadcut, Duluth, Minnesota, USA) 5
by James St. John
by James St. John
Stromatolites (Snowslip Formation, Belt Supergroup, Mesoproterozoic, 1.44 Ga; Glacier National Park, Montana, USA) 4
by James St. John
by James St. John
Large native copper mass (late Mesoproterozoic, 1.05 to 1.06 Ga; Keweenaw Peninsula, Upper Peninsula of Michigan, USA)
by James St. John
by James St. John
Allouez Conglomerate-flood basalt contact (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.094 Ga; Delaware Copper Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 1
by James St. John
by James St. John
Large anorthosite xenolith in ophitic ilmenite gabbro (anorthosite series, Duluth Complex, Mesoproterozoic, 1099 Ma; Keene Creek East Skyline Parkway roadcut, Duluth, Minnesota, USA) 3
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 3
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 8
by James St. John
by James St. John
Non-vesicular basalt flow over rubbly-topped vesicular basalt flow (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.094 to 1.095 Ga; Rt. 41 roadcut west of the Delaware Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 6
by James St. John
by James St. John
Precambrian-Cambrian nonconformity (Peerless Formation over Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 4
by James St. John
by James St. John
Basalt lava flows (North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 2
by James St. John
by James St. John
Granite (pgpf dike facies, Pikes Peak Batholith, Mesoproterozoic, 1.08 GA; Pikes Peak, Colorado, USA) 3
by James St. John
by James St. John
Non-vesicular basalt flow over rubbly-topped vesicular basalt flow (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.094 to 1.095 Ga; Rt. 41 roadcut west of the Delaware Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 5
by James St. John
by James St. John
Paleocobble (Allouez Conglomerate, Mesoproterozoic, ~1.094 Ga; Delaware Copper Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 2
by James St. John
by James St. John
Lateral breach in an end-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 2
by James St. John
by James St. John
Marinace Green Granite (polymict metaconglomerate) (Ouricuri do Ouro Formation, Mesoproterozoic, ~1.6-1.7 Ga; Bahia, Brazil) 1
by James St. John
by James St. John
Lateral breach in an end-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 3
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 4
by James St. John
by James St. John
Gabbroic anorthosite to anorthositic gabbro (anorthosite series, Duluth Complex, Mesoproterozoic, 1099 Ma; Merritt Creek West Skyline Parkway roadcut, Duluth, Minnesota, USA) 7
by James St. John
by James St. John
Stromatolites (Snowslip Formation, Belt Supergroup, Mesoproterozoic, 1.44 Ga; Glacier National Park, Montana, USA) 2
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 5
by James St. John
by James St. John
Non-vesicular basalt flow over rubbly-topped vesicular basalt flow (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.094 to 1.095 Ga; Rt. 41 roadcut west of the Delaware Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 2
by James St. John
by James St. John
Native copper in conglomerate (Keweenaw Peninsula, Michigan, USA)
by James St. John
by James St. John
Cripple Creek Granite (Mesoproterozoic, 1.46 Ga; Park County, central Colorado, USA) 6
by James St. John
by James St. John
361件～420件 (全 2,126件)