silurian

Ordovician-Silurian unconformity section (Dunkinsville Southwest roadcut, Ohio, USA) 5
by James St. John

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by Kyle Hartshorn

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by Kyle Hartshorn

Coral
by Kyle Hartshorn

Quarry
by Kyle Hartshorn

Araucarioxylon arizonicum (fossil wood) (Chinle Formation, Upper Triassic; south of Adamana, Arizona, USA) 2
by James St. John

Fossil plants in carbonaceous shale (top of Pottsville Formation, Middle Pennsylvanian; old coal mine ENE of St. Clair, Pennsylvania, USA) 16
by James St. John

Quartz arenite (Tuscarora Sandstone, Lower Silurian; Cacapon Mountain, south of Hancock, Maryland, USA) 4
by James St. John

Coral
by Kyle Hartshorn

Fletcheria sp. (fossil corals) (Lockport Dolomite, Middle Silurian; Rockford Stone Company Quarry, Rockford, Ohio, USA) 1
by James St. John

Dolostone breccia with brown fluorite (Lockport Dolomite, Middle Silurian; quarry in Ottawa County, Ohio, USA) 3
by James St. John

Fletcheria guelphensis (fossil coral) (Silurian; Ottawa County, Ohio, USA) 4
by James St. John

Eurypterids (fossil sea scorpions) (probably Silurian; South Bass Island, Lake Erie, Ohio, USA) 2
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) 2
by James St. John

Rock of Ages - National Botanic Garden of Wales - 431 - Silurian rocks
by ell brown

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by Kyle Hartshorn

Pyrite on dolostone (Silurian; Latham Limestone Quarry, Pike County, Ohio, USA) 1
by James St. John

Shatterconed dolostone (Serpent Mound Impact Structure, southern Ohio, USA) 2
by James St. John

Skolithos linearis burrows in sandstone (Clinch Formation, Lower Silurian; Clinch Mountain, Tennessee, USA) 11
by James St. John

Cycadella sp. (fossil cycad) (Morrison Formation, Upper Jurassic; Freezeout Hills, Wyoming, USA) 3
by James St. John

Quartz-permineralized fossil wood 27
by James St. John

Fossiliferous oolitic ironstone (Brassfield Formation, Lower Silurian; Bainbridge, Ross County, Ohio, USA) 1
by James St. John

Rhododendron sp. (Newark, Ohio, USA) 12
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) 3
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) 4
by James St. John

Chert in dolomitic limestone (Laurel Member, Salamonie Dolomite, Middle Silurian; St. Paul Stone Quarry, St. Paul, Indiana, USA) 4
by James St. John

Coral
by Kyle Hartshorn

Metasequoia glyptostroboides (dawn redwood cone) 3
by James St. John

Stigmaria fossil root (Newark, Ohio, USA) 2
by James St. John

Two-beam interference colors in calcite (Ohio Brush Creek North roadcut, Adams County, Ohio, USA)
by James St. John

Pecopteris carbonized fossil ferns (Pennsylvanian)
by James St. John

Rhododendron sp. (Newark, Ohio, USA) 23
by James St. John

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by Kyle Hartshorn

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

Via Rail Canada # 6430 diesel locomotive (Gascons, Quebec, Canada) (23 or 24 July 1989) 1
by James St. John

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

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

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

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by Kyle Hartshorn

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

Arthrophycus alleghaniensis trace fossils (Clinch Formation, Lower Silurian; Tennessee, USA) 19
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

Cannabis sativa (marijuana plant) (Zanesville, Ohio, USA)
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

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

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

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

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

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

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

Stylolite in limestone (Brassfield Formation, Lower Silurian; Fairborn, Ohio, USA) 7
by James St. John