silurian

Pentamerid brachiopods in dolostone (Racine Formation, Middle Silurian; Grafton, Illinois, USA) 1
by James St. John

Fossil tree trunk
by James St. John

Hypoestes phyllostachya (polka dot plant) 3
by James St. John

Nautiloid (Silurian; Mt. Sterling, Ohio, USA) 2
by James St. John

Favositid coral (Lockport Dolomite, Middle Silurian; quarry in Ottawa County, Ohio, USA) 1
by James St. John

Populus tremuloides (quaking aspen) (Rocky Mountains National Park, Colorado, USA) 2
by James St. John

Acacia pycnantha (golden wattle) (Sellicks Hill, Fleurieu Peninsula, South Australia) 3
by James St. John

Petroliferous calcite in dolostone matrix (Serpent Mound Impact Structure, southern Ohio, USA) 3
by James St. John

Geneva Dolomite Member of the Jeffersonville Limestone (Lower Devonian) over the Louisville Limestone (Middle Silurian) over the Waldron Shale (Middle Silurian) (St. Paul Stone Quarry, St. Paul, Indiana, USA) 4
by James St. John

Aneurophyton fossil land plants (Devonian; Gilboa, southeastern New York State, USA)
by James St. John

Metatuffs (Cranberry Island Series, Upper Silurian, 424 Ma; Seawall Beach, Mt. Desert Island, Maine, USA) 10
by James St. John

Rhizophora mangle (red mangroves) (San Salvador Island, Bahamas) 5
by James St. John

Folded dolostones and argillaceous beds (Tymochtee Dolomite, Upper Silurian; South Bass Island, Lake Erie, Ohio, USA) 5
by James St. John

Lepidodendron fossil branch in ferruginous siltstone (lower Pottsville Group, Lower Pennsylvanian; Irish Ridge East Outcrop, near Trinway, Ohio, USA)
by James St. John

Ginkgo biloba leaves 4
by James St. John

Eospermatopteris textilis fossil tree trunk (Ithaca Formation, Upper Devonian; Riverside Quarry, Gilboa, Schoharie County, New York State, USA)
by James St. John

Cadillac Mountain Granite (Silurian-Devonian boundary times, ~419 Ma; Acadia National Park, Maine, USA) 10
by James St. John

Porphyritic diabase (Cape Ann, Massachusetts, USA) 2
by James St. John

Acer saccharinum (silver maple tree in fall colors) (Newark campus of Ohio State University, Newark, Ohio, USA) (20 October 2015) 4
by James St. John

Cadillac Mountain Granite (Silurian-Devonian boundary times, ~419 Ma; Acadia National Park, Maine, USA) 1
by James St. John

Juniperus horizontalis (creeping juniper) (Buck Hill, Little Missouri Badlands, North Dakota, USA) 4
by James St. John

Acer saccharum (sugar maple tree in fall colors) (Hilltop Drive, just north of Ohio State University at Newark campus, Newark, Ohio, USA) (22 October 2015)
by James St. John

Fluorite (Genoa Quarry, Ottawa County, Ohio, USA) 1
by James St. John

Rhizophora mangle (red mangroves) (San Salvador Island, Bahamas) 6
by James St. John

Well cuttings from the VanWinkle Unit # 1 petroleum well (west of Granville, Ohio, USA) 1
by James St. John

Psychotria ligustrifolia (Bahama coffee) 1
by James St. John

Fossil plants in carbonaceous shale (top of Pottsville Formation, Middle Pennsylvanian; old coal mine ENE of St. Clair, Pennsylvania, USA) 13
by James St. John

Thalassia testudinum (turtle grass) (South Pigeon Creek estuary, San Salvador Island, Bahamas) 1
by James St. John

Put-in-Bay Dolomite over Tymochtee Dolomite (Upper Silurian; South Bass Island, Lake Erie, Ohio, USA) 1
by James St. John

Folded dolostones and argillaceous beds (Tymochtee Dolomite, Upper Silurian; South Bass Island, Lake Erie, Ohio, USA) 8
by James St. John

Cycadella sp. (fossil cycad) (Morrison Formation, Upper Jurassic; Freezeout Hills, Wyoming, USA) 4
by James St. John

Casuarina equisetifolia (ironwood) (San Salvador Island, Bahamas) 4
by James St. John

roly poly
by marsupium photography

Folded dolostones and argillaceous beds (Tymochtee Dolomite, Upper Silurian; South Bass Island, Lake Erie, Ohio, USA) 4
by James St. John

Fluorite (Stoneco's White Rock Quarry, Clay Center, Ohio, USA) 4
by James St. John

Fluorite (Genoa Quarry, Ottawa County, Ohio, USA) 5
by James St. John

Folded dolostones and argillaceous beds (Tymochtee Dolomite, Upper Silurian; South Bass Island, Lake Erie, Ohio, USA) 2
by James St. John

Divalinga quadrisulcata (cross-hatched lucine clam) (San Salvador Island, Bahamas) 1
by James St. John

Boyle Formation over the Estill Shale (Devonian over Silurian; Drowning Creek West roadcut, Madison County, Kentucky, USA) 1
by James St. John

Trilobite
by Lukas Large

Stony Creek Syncline in the Appalachian Mountains (Cross Mountain-Shady Valley-Iron Mountains, Tennessee, USA)
by James St. John

Acer palmatum (Japanese maple tree) (Newark, Ohio, USA) 4
by James St. John

Carneyella ulrichi hardground surface (Bellevue Formation, Upper Ordovician; Jersey Ridge roadcut, Rt. 62-Rt. 68, just south of Harsha Bridge over the Ohio River, northern Kentucky, USA)
by James St. John

Geneva Dolomite Member of the Jeffersonville Limestone (Lower Devonian) (St. Paul Stone Quarry, St. Paul, Indiana, USA)
by James St. John

Botrypus virginianus (rattlesnake fern) (Natural Bridge State Park, northeast of Leland, Wisconsin, USA) 4
by James St. John

Oryzopsis hymenoides (Indian ricegrass) (Salina Canyon, Utah, USA) 2
by James St. John

Juniperus osteosperma (Utah juniper) (No Thoroughfare Canyon, Colorado National Monument, Colorado, USA) 5
by James St. John

Acer saccharum (sugar maple tree in fall colors) (Granville Road, Newark, Ohio, USA) (25 October 2015) 3
by James St. John

Blow line & pit at Hendren Century Farms # 2 petroleum well (north of Johnstown, Ohio, USA) 4
by James St. John

Petroliferous calcite in dolostone matrix (Serpent Mound Impact Structure, southern Ohio, USA) 1
by James St. John

Quartz-permineralized fossil wood 3
by James St. John

Acer saccharum (sugar maple trees in fall colors) (Newark campus of Ohio State University, Newark, Ohio, USA) (22 October 2015) 2
by James St. John

Folded dolostones and argillaceous beds (Tymochtee Dolomite, Upper Silurian; South Bass Island, Lake Erie, Ohio, USA) 7
by James St. John

Put-in-Bay Dolomite over Tymochtee Dolomite (Upper Silurian; South Bass Island, Lake Erie, Ohio, USA) 11
by James St. John

Fluorite (Stoneco's White Rock Quarry, Clay Center, Ohio, USA) 7
by James St. John

Acer saccharum (sugar maple tree in fall colors) (Country Club Drive, Newark, Ohio, USA) (25 October 2015) 4
by James St. John

Fouquieria splendens (ocotillo) 1
by James St. John

Fossil plants in carbonaceous shale (top of Pottsville Formation, Middle Pennsylvanian; old coal mine ENE of St. Clair, Pennsylvania, USA) 2
by James St. John

Fluorite (Stoneco's White Rock Quarry, Clay Center, Ohio, USA) 2
by James St. John

Acer saccharum (sugar maple tree in fall colors) (Newark campus of Ohio State University, Newark, Ohio, USA) (21 October 2015) 2
by James St. John