silurian

Fossil ferns (Pennsylvanian; Coal Ridge Mine, Noble County, Ohio, USA) 1
by James St. John

Porphyritic diabase (Cape Ann, Massachusetts, USA) 1
by James St. John

Celestite in dolostone (Lockport Dolomite, Middle Silurian; quarry at Clay Center, Ohio, USA) 1
by James St. John

DSC06067
by Kyle Hartshorn

Cannabis sativa (marijuana plant) (Zanesville, Ohio, USA)
by James St. John

Sabal palmetto (cabbage palm trees) (Sanibel Island, Florida, USA) 1
by James St. John

Ginkgo biloba tree in fall colors (Newark, Ohio, USA)
by James St. John

Waldron Shale (Middle Silurian) (St. Paul Stone Quarry, St. Paul, Indiana, USA) 4
by James St. John

Granite (Cape Ann Complex, Late Ordovician to Late Silurian, 426-450 Ma; Rockport, Massachusetts, USA) 1
by James St. John

Estill Shale (Lower Silurian; Ohio Brush Creek North outcrop, southern Ohio, USA) 9
by James St. John

Fletcheria guelphensis (fossil coral) (Silurian; Ottawa County, Ohio, USA) 1
by James St. John

DSC06068
by Kyle Hartshorn

Petroliferous calcite in dolostone matrix (Serpent Mound Impact Structure, southern Ohio, USA) 8
by James St. John

Fletcheria guelphensis (fossil coral) (Silurian; Ottawa County, Ohio, USA) 2
by James St. John

Nautiloid cephalopod in dolostone (Lockport Dolomite, Middle Silurian; quarry at Clay Center, Ottawa County, Ohio, USA) 3
by James St. John

Oolitic ironstone (Brassfield Formation, Lower Silurian; Ohio Brush Creek roadcut, southern Ohio, USA) 3
by James St. John

Kirkidium laqueatum pentamerid brachiopods in limestone (bioherm facies of the Wabash Formation, Ludlovian Series, Upper Silurian; Pipe Creek Junior Quarry, Swayzee, Indiana, USA) 3
by James St. John

Boyle Formation over the Estill Shale (Devonian over Silurian; Drowning Creek West roadcut, Madison County, Kentucky, USA) 2
by James St. John

Whirlpool Sandstone (Lower Silurian; The Whirlpool, Niagara River, Ontario, Canada)
by James St. John

Araucaria mirabilis (fossil cone) (Jurassic; Argentina) 3
by James St. John

Cooksonia sp. (fossil plant) (Bertie Dolomite, Upper Silurian; Ridemount Quarry, Fort Erie, Ontario, Canada) 1
by James St. John

Estill Shale (Lower Silurian; Ohio Brush Creek North outcrop, southern Ohio, USA) 14
by James St. John

Monograptus sp. (fossil graptolites) (Lower Graptolitic Shales, Middle Silurian; Żdanów section, Bardzkie Mountains, Poland)
by James St. John

Coral
by Kyle Hartshorn

Rhododendron sp. (Newark, Ohio, USA) 19
by James St. John

Folded dolostones (Put-in-Bay Dolomite over Tymochtee Dolomite, Upper Silurian; South Bass Island, Lake Erie, Ohio, USA) 6
by James St. John

Streptaster vorticellatus (fossil edrioasteroid) (Bellevue Limestone, Upper Ordovician; Jersey Ridge roadcut, northern Kentucky, USA)
by James St. John

Chert in dolomitic limestone (Laurel Member, Salamonie Dolomite, Middle Silurian; St. Paul Stone Quarry, St. Paul, Indiana, USA) 2
by James St. John

Estill Shale (Lower Silurian; Ohio Brush Creek North outcrop, southern Ohio, USA) 17
by James St. John

Pyrite crystal-lined vug in vuggy, sucrosic dolostone (Lockport Dolostone, Middle Silurian; National Lime & Stone Company Buckland Quarry, Auglaize County, Ohio, USA) 1
by James St. John

DSC_1273
by Kyle Hartshorn

Galena-sphalerite in sandstone (Tuscarora Formation, Lower Silurian; Milesburg Gap, Pennsylvania, USA) 3
by James St. John

Kirkidium laqueatum pentamerid brachiopods in limestone (bioherm facies of the Wabash Formation, Ludlovian Series, Upper Silurian; Pipe Creek Junior Quarry, Swayzee, Indiana, USA) 1
by James St. John

Shattercone (quarry at Kentland Dome Impact Structure, Indiana, USA) 1
by James St. John

Coral
by Kyle Hartshorn

Ordovician-Silurian unconformity section (Dunkinsville Southwest roadcut, Ohio, USA) 1
by James St. John

Glauconitic fossiliferous argillaceous limestone (Waldron Shale, Middle Silurian; St. Paul Stone Quarry, St. Paul, Indiana, USA)
by James St. John

Petroliferous calcite in dolostone matrix (Serpent Mound Impact Structure, southern Ohio, USA) 4
by James St. John

Retrograde eclogite (Late Silurian to Early Devonian metamorphism, about 400-420 Ma; near Tulle, Massif Central, Correze Department, south-central France) 2
by James St. John

Geneva Dolomite Member of the Jeffersonville Limestone (Lower Devonian) over the Louisville Limestone-Waldron Shale-Laurel Member (Middle Silurian) (St. Paul Stone Quarry, St. Paul, Indiana, USA) 2
by James St. John

Pyrite crystal-lined vug in vuggy, sucrosic dolostone (Lockport Dolostone, Middle Silurian; National Lime & Stone Company Buckland Quarry, Auglaize County, Ohio, USA) 2
by James St. John

Laurel Member of the Salamonie Dolomite (Middle Silurian) (St. Paul Stone Quarry, St. Paul, Indiana, USA) 7
by James St. John

Oolitic ironstone (Brassfield Formation, Lower Silurian; Ohio Brush Creek roadcut, southern Ohio, USA) 4
by James St. John

Estill Shale (Lower Silurian; Ohio Brush Creek North outcrop, southern Ohio, USA) 7
by James St. John

Rocky shore & waves (next to Thunder Hole, Mt. Desert Island, Maine, USA) 9
by James St. John

Chert in dolomitic limestone (Laurel Member, Salamonie Dolomite, Middle Silurian; St. Paul Stone Quarry, St. Paul, Indiana, USA) 1
by James St. John

Alethopteris sp. (fossil seed fern foliage) (Pennsylvanian; probably St. Clair, Pennsylvania, USA)
by James St. John

Eurypterus remipes (fossil sea scorpion) (Fiddlers Green Formation, Upper Silurian; Herkimer County, New York State, USA) 3
by James St. John

Cocos nucifera (coconut palms) (Eleuthera Island, Bahamas) 1
by James St. John

Halitite (Salina Group, Silurian; Detroit Salt Company mine, Detroit, Michigan, USA) 2
by James St. John

Fluorite-calcite on Silurian dolostone (Stoneco's White Rock Quarry, Clay Center, Ohio, USA)
by James St. John

Impact-deformed dolostones (Paadla Formation, Upper Silurian; Kaali Impact Crater, Kaali, Saaremaa Island, Estonia)
by James St. John

Fluorite on Silurian dolostone (Stoneco's White Rock Quarry, Clay Center, Ohio, USA) 3
by James St. John

Chert in dolomitic limestone (Laurel Member, Salamonie Dolomite, Middle Silurian; St. Paul Stone Quarry, St. Paul, Indiana, USA) 3
by James St. John

Rock-mineral-fossil tree
by James St. John

Geneva Dolomite Member of the Jeffersonville Limestone (Lower Devonian) over the Louisville Limestone-Waldron Shale-Laurel Member (Middle Silurian) (St. Paul Stone Quarry, St. Paul, Indiana, USA) 1
by James St. John

Waldron Shale (Middle Silurian) (St. Paul Stone Quarry, St. Paul, Indiana, USA) 3
by James St. John

Rhizophora mangle (red mangrove) (San Salvador Island, Bahamas) 1
by James St. John

Estill Shale (Lower Silurian; Ohio Brush Creek North outcrop, southern Ohio, USA) 3
by James St. John

Structurally-tilted Wills Creek Formation (Upper Silurian; Western Maryland Rail Trail, Cacapon Mountain Anticline, Maryland, USA) 5
by James St. John