silurian

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

Fossil Cystoid
by Lukas Large

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 (Genoa Quarry, Ottawa County, Ohio, USA) 5
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

Araucaria heterophylla (Norfolk Island pine trees) (Kangaroo Island, South Australia) 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

Thuja occidentalis (eastern arbor vitae tree) (Natural Bridge State Park, Virginia, USA) 1
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

Lichens encrusting Cadillac Mountain Granite (Cadillac Mountain, Acadia National Park, Maine, USA) 5
by James St. John

Acer palmatum (Japanese maple tree) (Newark, Ohio, USA) 2
by James St. John

Ficus aurea (Florida strangler fig) (Sanibel Island, Florida, USA) 2
by James St. John

Acer saccharum (sugar maple tree in fall colors) (Newark campus of Ohio State University, Newark, Ohio, USA) (23 October 2015) 2
by James St. John

Fluorite (Genoa Quarry, Ottawa County, Ohio, USA) 3
by James St. John

Abronia fragrans or Abronia elliptica (sand verbena) (Arches National Park, Utah, USA)
by James St. John

Apios americana - American groundnut (Indian potato) (Symmes Creek, Muskingum County, Ohio, USA) 1
by James St. John

Metatuffs (Cranberry Island Series, Upper Silurian, 424 Ma; Seawall Beach, Mt. Desert Island, Maine, USA) 8
by James St. John

Blow line & pit at Hendren Century Farms # 2 petroleum well (north of Johnstown, Ohio, USA) 7
by James St. John

Mudlogging trailer at Hendren Century Farms # 2 petroleum well (north of Johnstown, Ohio, USA) 5
by James St. John

Blow line & pit at Hendren Century Farms # 2 petroleum well (north of Johnstown, Ohio, USA) 5
by James St. John

Doe Mountain Anticlinorium (northeastern tip of Tennessee, USA) 1
by James St. John

Coccothrinax argentata (silver thatch palms) (San Salvador Island, Bahamas) 5
by James St. John

Muscari sp. (grape hyacinths) (Newark, Ohio, USA) 4
by James St. John

Cullison # 4A oil well (Tunnel Hill, Coshocton County, Ohio, USA)
by James St. John

Ficus aurea (Florida strangler fig) (Sanibel Island, Florida, USA) 12
by James St. John

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

Carneyella ulrichi hardground quarry (Bellevue Formation, Upper Ordovician; Jersey Ridge roadcut, Rt. 62-Rt. 68, just south of Harsha Bridge over the Ohio River, northern Kentucky, USA) 4
by James St. John

Rusophycus (trilobite burrow) (Ordovician-Silurian boundary section, Route 41 roadcut at Ohio Brush Creek, Adams County, Ohio, USA) 3
by James St. John

Hyacinthus orientalis (common hyacinth) (Newark, Ohio, USA) 2
by James St. John

Geolograph at Hendren Century Farms # 2 petroleum well (north of Johnstown, Ohio, USA)
by James St. John

DSCN0918
by Curtis Abert

Archaeopteris cf. Archaeopteris halliana fossil land plant (Devonian; Quebec, Canada) 1
by James St. John

Wrens Nest Panorama
by Lukas Large

Acer saccharum (sugar maple tree in fall colors) (Newark campus of Ohio State University, Newark, Ohio, USA) (20 October 2015) 2
by James St. John

Well cuttings from the VanWinkle Unit # 1 petroleum well (west of Granville, Ohio, USA) 2
by James St. John