James St. John:
Fluvial abrasion polish on Sioux Quartzite (Paleoproterozoic, 1.65-1.70 Ga; Falls Park, Sioux Falls, South Dakota, USA)
James St. John:
BIF ventifact (limonite-magnetite banded iron formation, Archean; Ferris Dune Field, Windy Gap, Wyoming, USA) 1
James St. John:
BIF ventifact (limonite-magnetite banded iron formation, Archean; Ferris Dune Field, Windy Gap, Wyoming, USA) 2
James St. John:
BIF ventifact (limonite-magnetite banded iron formation, Archean; Ferris Dune Field, Windy Gap, Wyoming, USA) 3
James St. John:
BIF ventifact (hematite-rich banded iron formation, Archean; Ferris Dune Field, Windy Gap, Wyoming, USA) 1
James St. John:
BIF ventifact (hematite-rich banded iron formation, Archean; Ferris Dune Field, Windy Gap, Wyoming, USA) 2
James St. John:
BIF ventifact (hematite-rich banded iron formation, Archean; Ferris Dune Field, Windy Gap, Wyoming, USA) 3
James St. John:
BIF ventifact (hematite-rich banded iron formation, Archean; Ferris Dune Field, Windy Gap, Wyoming, USA) 4
James St. John:
BIF ventifact (hematite-rich banded iron formation, Archean; Ferris Dune Field, Windy Gap, Wyoming, USA) 5
James St. John:
Structural polish in semi-anthracite coal (Langhorne Coal, Lower Mississippian; Cloyds Mountain roadcut, Valley Coalfield, Virginia, USA) 1
James St. John:
Structural polish in semi-anthracite coal (Langhorne Coal, Lower Mississippian; Cloyds Mountain roadcut, Valley Coalfield, Virginia, USA) 2
James St. John:
Structural polish in semi-anthracite coal (Langhorne Coal, Lower Mississippian; Cloyds Mountain roadcut, Valley Coalfield, Virginia, USA) 3
James St. John:
Structural polish in semi-anthracite coal (Langhorne Coal, Lower Mississippian; Cloyds Mountain roadcut, Valley Coalfield, Virginia, USA) 4
James St. John:
Structural polish in semi-anthracite coal (Langhorne Coal, Lower Mississippian; Cloyds Mountain roadcut, Valley Coalfield, Virginia, USA) 5
James St. John:
Dolerite ventifact (Dry Valleys, Antarctica) 1
James St. John:
Dolerite ventifact (Dry Valleys, Antarctica) 2
James St. John:
Dolerite ventifact (Dry Valleys, Antarctica) 3
James St. John:
Ventifact (near Shoshoni, Wyoming, USA) 1
James St. John:
Ventifact (near Shoshoni, Wyoming, USA) 2
James St. John:
Ventifact (near Shoshoni, Wyoming, USA) 3
James St. John:
Ventifact (near Shoshoni, Wyoming, USA) 4
James St. John:
Ventifact (near Shoshoni, Wyoming, USA) 5
James St. John:
Ventifact (near Shoshoni, Wyoming, USA) 6
James St. John:
Ventifact (near Shoshoni, Wyoming, USA) 7
James St. John:
Dolerite ventifact (McMurdo Sound area, Antarctica) 1
James St. John:
Dolerite ventifact (McMurdo Sound area, Antarctica) 2
James St. John:
Dolerite ventifact (McMurdo Sound area, Antarctica) 3
James St. John:
Rose quartz ventifact (Namibian Desert, Africa)
James St. John:
Glacial polish & glacial striations on lava (Lassen Volcano National Park, California, USA) 1
James St. John:
Glacial polish & glacial striations on lava (Lassen Volcano National Park, California, USA) 2
