laurentia
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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
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
by James St. John
Amygdaloidal basalt (North Shore Volcanic Series, upper Mesoproterozoic, ~1.1 Ga; Grand Marais, Cook County, Minnesota, USA)
by James St. John
by James St. John
Basalt (Proterozoic, ~1 Ga; subsurface Saunders County, Nebraska, 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) 10
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) 5
by James St. John
by James St. John
Lakeshore beach gravel (upper Holocene; derived from the North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 2
by James St. John
by James St. John
End-Pleistocene large pothole complex in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Devil's Parlor Pothole Complex, Interstate State Park, Taylors Falls, Minnesota, USA) 5
by James St. John
by James St. John
End-Pleistocene large pothole complex in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Devil's Parlor Pothole Complex, Interstate State Park, Taylors Falls, Minnesota, USA) 6
by James St. John
by James St. John
End-Pleistocene large pothole complex in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Devil's Parlor Pothole Complex, Interstate State Park, Taylors Falls, Minnesota, USA) 8
by James St. John
by James St. John
End-Pleistocene large pothole complex in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Devil's Parlor Pothole Complex, Interstate State Park, Taylors Falls, Minnesota, USA) 12
by James St. John
by James St. John
End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bottomless Pit Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 4
by James St. John
by James St. John
End-Pleistocene large pothole complex in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Devil's Parlor Pothole Complex, Interstate State Park, Taylors Falls, Minnesota, USA) 11
by James St. John
by James St. John
End-Pleistocene large pothole complex in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Devil's Parlor Pothole Complex, Interstate State Park, Taylors Falls, Minnesota, USA) 10
by James St. John
by James St. John
End-Pleistocene large pothole complex in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Devil's Parlor Pothole Complex, Interstate State Park, Taylors Falls, Minnesota, USA) 7
by James St. John
by James St. John
End-Pleistocene large pothole complex in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Devil's Parlor Pothole Complex, Interstate State Park, Taylors Falls, Minnesota, USA) 3
by James St. John
by James St. John
End-Pleistocene large pothole complex in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Devil's Parlor Pothole Complex, Interstate State Park, Taylors Falls, Minnesota, USA) 2
by James St. John
by James St. John
End-Pleistocene large pothole complex in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Devil's Parlor Pothole Complex, Interstate State Park, Taylors Falls, Minnesota, USA) 1
by James St. John
by James St. John
61件～120件 (全 7,527件)