laurentia
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Quartz tholeiite basalt lava flow (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 8
by James St. John
by James St. John
サイズ変更など
Lester River & Japp Hole Falls (Lester Park, Minnesota, USA)
by James St. John
by James St. John
Quartz tholeiite basalt lava flow (flow A, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 16
by James St. John
by James St. John
The Early Cambrian Experiment in Reef-Building by Metazoans
by James St. John
by James St. John
Large quartz-laumontite amygdule in quartz tholeiite basalt lava flow (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 2
by James St. John
by James St. John
Nevadella sp. (fossil trilobite) (Poleta Formation, Lower Cambrian; Indian Springs Canyon, Montezuma Range, Nevada, USA)
by James St. John
by James St. John
Large quartz-laumontite amygdule in quartz tholeiite basalt lava flow (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 6
by James St. John
by James St. John
Large quartz-laumontite amygdules in quartz tholeiite basalt lava flow (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 1
by James St. John
by James St. John
Microscopic Treasures - Scolecodonts from the Type Cincinnatian
by James St. John
by James St. John
Quartz tholeiite basalt lava flow (flow A, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 15
by James St. John
by James St. John
Quartz tholeiite basalt lava flow (flow A, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 1
by James St. John
by James St. John
Agnostoid trilobites in limestone (Wheeler Formation, Middle Cambrian; southeastern corner of the Drum Mountains, Utah, USA)
by James St. John
by James St. John
Autobrecciated amygdaloidal quartz tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 3
by James St. John
by James St. John
Amygdaloidal basalt (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 2
by James St. John
by James St. John
Olivine tholeiite basalt lava flow at Gooseberry Falls - Upper Falls (Gooseberry River Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Gooseberry Falls State Park, Minnesota, USA)
by James St. John
by James St. John
Quartz tholeiite basalt lava flow (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 6
by James St. John
by James St. John
Large quartz-laumontite amygdule in quartz tholeiite basalt lava flow (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 5
by James St. John
by James St. John
Olivine tholeiite basalt lava flow below Gooseberry Falls - Lower Falls (Gooseberry River Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Gooseberry Falls State Park, Minnesota, USA)
by James St. John
by James St. John
Cross-bedded volcanic lithic sandstone (North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 3
by James St. John
by James St. John
Large quartz-laumontite amygdules in quartz tholeiite basalt lava flow (Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 4
by James St. John
by James St. John
Volcanic lithic sandstone (North Shore Volcanic Group, Mesoproterozoic ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 6
by James St. John
by James St. John
Mylonite (Paleozoic; Moine Thrust Zone, Northwest Highlands, Scotland)
by James St. John
by James St. John
Quartz tholeiite basalt lava flow (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 3
by James St. John
by James St. John
Quartz tholeiite basalt lava flow (flow A, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 14
by James St. John
by James St. John
Autobrecciated amygdaloidal quartz tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 5
by James St. John
by James St. John
Plunge pool of Gooseberry Falls - Upper Falls (Gooseberry River, North Shore of Lake Superior, Minnesota, USA)
by James St. John
by James St. John
Calcite veins in limestone (Wheeler Formation, Middle Cambrian; southeastern corner of the Drum Mountains, Utah, USA)
by James St. John
by James St. John
Volcanic lithic sandstone (North Shore Volcanic Group, Mesoproterozoic ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 1
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) 2
by James St. John
by James St. John
481件～540件 (全 8,234件)