James St. John:
Hexagonaria sp. (fossil coral) (Devonian; Lake Michigan shoreline, near Bay View, Michigan, USA) 1
James St. John:
Jaspilite (Ironwood Iron-Formation, Paleoproterozoic, ~1.874-1.878 Ga; Wakefield, Gogebic Iron Range, Upper Peninsula of Michigan, USA) 1
James St. John:
Silver-prehnite-copper (Mesoproterozoic, 1.05-1.06 Ga; Quincy Mine, Hancock, Upper Peninsula of Michigan, USA)
James St. John:
Chlorite schist (Michigamme Mine, Upper Peninsula of Michigan, USA)
James St. John:
Glacial copper (Portage Lake Volcanic Series, late Mesoproterozoic, 1.05 to 1.06 Ga; Upper Peninsula of Michigan, USA) 2
James St. John:
Porphyritic trachyte (Paleoproterozoic, 2.45-2.47 Ga; Bannockburn, Ontario, Canada) 1
James St. John:
Percussion marks (Sioux Quartzite, Paleoproterozoic, 1.65-1.70 Ga; Falls Park, Sioux Falls, South Dakota, USA) 1
James St. John:
Agate (shoreline of Lake Superior, Upper Peninsula of Michigan, USA) 2
James St. John:
Stromatolitic ferruginous chert (Mary Ellen Jasper) (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Mesabi Iron Range, Minnesota, USA) 1
James St. John:
Silicified favositid coral (Middle Paleozoic; Salt Creek gravel bar clast, Haynes, Ohio, USA) 1
James St. John:
Agate-filled geode (Las Choyas Geode Deposit, near-latest Eocene, ~35 Ma; Chihuahua, Mexico) 6
James St. John:
Agate-filled geode (Las Choyas Geode Deposit, near-latest Eocene, ~35 Ma; Chihuahua, Mexico) 1
James St. John:
Agate 4
James St. John:
Teepee Canyon Agate (Custer, South Dakota, USA)
James St. John:
Agate nodule ("Lake Superior Agate") 2
James St. John:
Banded chalcedony (Prairie Agate) (White River Badlands area, western South Dakota, USA) 2
James St. John:
Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 6
James St. John:
Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 2
James St. John:
Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 1
James St. John:
Imitoceras rotatorium fossil ammonoid (Mississippian; Seymour, Indiana, USA)
James St. John:
Onychocrinus exculptus fossil crinoid (Edwardsville Formation, Lower Mississippian; Crawfordsville area, Montgomery County, Indiana, USA)
James St. John:
Platycrinites saffordi fossil crinoid (Edwardsville Formation, Lower Mississippian; Crawfordsville area, Montgomery County, Indiana, USA)
James St. John:
Agaricocrinus fossil crinoid (Edwardsville Formation, Lower Mississippian; Crawfordsville area, Montgomery County, Indiana, USA)
James St. John:
Cyathocrinites multibrachiatus fossil crinoid (Edwardsville Formation, Lower Mississippian; Crawfordsville area, Montgomery County, Indiana, USA) 1
James St. John:
Allenypterus montanus (fossil coelacanth fish) (Bear Gulch Limestone, Upper Mississippian; Potter Creek Dome, Montana, USA)
James St. John:
Dichocrinus ficus (fossil crinoid) (Edwardsville Formation, Lower Mississippian; near Crawfordsville, Indiana, USA) 3
James St. John:
Tidalites (Salem Limestone, Middle Mississippian; Rt. 37 roadcut north of Harrodsburg, Indiana, USA) 1
James St. John:
Zoophycos trace fossil (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut northeast of Frazeysburg, Ohio, USA) 1
