fossiliferous

"Solenopora" jurassica (fossil red algae) in limestone (White Limestone Formation, Middle Jurassic, 165-168 Ma; Foss Cross Quarry, Gloucestershire, England) 1
by James St. John

Fossil nautiloid shell with original iridescent nacre in fossiliferous asphaltic limestone (Buckhorn Asphalt, Middle Pennsylvanian; Buckhorn Asphalt Quarry, Oklahoma, USA) 2
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 34
by James St. John

Fossiliferous limestone with echinoid spines (Putnam Hill Limestone, Middle Pennsylvanian; waste rock pile from old clay mine along Blunt Run, Muskingum Township, Muskingum County, Ohio, USA)
by James St. John

Fossiliferous limestone (Columbus Limestone, Middle Devonian; Sullivant Quarry, Columbus, Ohio, USA) 19
by James St. John

Fossiliferous sandstone (Vinton Member, Logan Formation, Lower Mississippian; Hanover Pit, Licking County, Ohio, USA) 9
by James St. John

Fossiliferous limestone (Upper Mercer Limestone, Middle Pennsylvanian; Noland Tunnel's north portal outcrop, Tunnel Hill, Coshocton County, Ohio, USA) 2
by James St. John

Archaeocyathan limestone (Ajax Limestone, Lower Cambrian; Mt. Scott Range, South Australia) 5
by James St. John

Fossiliferous limestone (Gravel Point Formation, Middle Devonian; near South Point, west of Charlevoix, Michigan, USA) 2
by James St. John

Archaeocyathan limestone (Ajax Limestone, Lower Cambrian; Ajax Mine, South Australia) 51
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 162
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 163
by James St. John

Fasciculiconcha knightii (fossil bivalve) (Upper Mercer Limestone, Middle Pennsylvanian; Rock Cut railroad cut, south-southeast of Dresden, Ohio, USA) 7
by James St. John

Ellipsocephalus hoffii (fossil trilobites) (Jince Formation, Middle Cambrian; vicinity of Jince, Stredocesky Region, Bohemia, Czech Republic) 3
by James St. John

Fossiliferous limestone (Jeffersonville Limestone, Middle Devonian; Falls of the Ohio, southern Indiana, USA) 37
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 160
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 169
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 179
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 110
by James St. John

Glacial grooves from Pleistocene glaciation on Columbus Limestone (Middle Devonian) (Glacial Grooves State Park, Kelleys Island, Ohio, Lake Erie, USA) 1
by James St. John

Stromatoporoid fragments (Ashlock Formation, Upper Ordovician; Paint Lick Elementary School outcrop, Garrard County, Kentucky, USA) 23
by James St. John

Anthracomedusa turnbulli (fossil jellyfish) (Mazon Creek Lagerstätte, Francis Creek Shale, Middle Pennsylvanian; coal mine dump pile near Essex, northern Illinois, USA)
by James St. John

Teleoceras major (fossil barrel-bodied rhinos) in volcanic tuff (Ash Hollow Formation, Miocene, 11.83 Ma; Ashfall Fossil Beds, Nebraska, USA) 28
by James St. John

Fossiliferous limestone (Columbus Limestone, Middle Devonian; Sullivant Quarry, Columbus, Ohio, USA) 45
by James St. John

Fossiliferous limestone with phylloidal algae (Putnam Hill Limestone, Middle Pennsylvanian; waste rock pile from old clay mine along Blunt Run, Muskingum Township, Muskingum County, Ohio, USA) 4
by James St. John

Stromatoporoid (Ashlock Formation, Upper Ordovician; Paint Lick Elementary School outcrop, Garrard County, Kentucky, USA) 29
by James St. John

Bandringa rayi (fossil shark) (Mazon Creek Lagerstätte, Francis Creek Shale, Middle Pennsylvanian; coal mine dump pile near Essex, northern Illinois, USA) 1
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 166
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 172
by James St. John

Brachiopod in fossiliferous limestone (Lowellville Limestone, Lower Pennsylvanian; Beach City Dam outcrop, northeastern Ohio, USA) 3
by James St. John

Minor back thrust fault in interbedded fossiliferous limestones and shales (Fairview Formation, Upper Ordovician; upper cut, Maysville West roadcut, Kentucky, USA) 4
by James St. John

Fossiliferous flint mass in limestone (Upper Mercer Limestone, Middle Pennsylvanian; Rock Cut railroad cut, south-southeast of Dresden, Ohio, USA) 1
by James St. John

Pentamerid brachiopods in dolostone (Silurian) 4
by James St. John

Bituminous coal with turgite (Middle Mercer Coal, Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 3
by James St. John

Archaeocyathan limestone (Ajax Limestone, Lower Cambrian; Ajax Mine, South Australia) 30
by James St. John

Fossiliferous limestone (Columbus Limestone, Middle Devonian; Sullivant Quarry, Columbus, Ohio, USA) 87
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 182
by James St. John

Silicified rugose corals in fossiliferous limestone (Honaker Trail Formation, Upper Pennsylvanian; Grand County, Utah, USA) 1
by James St. John

Historic Entrance (Mammoth Cave, Kentucky, USA) 16
by James St. John

Encrinite (crinoidal limestone) (Ft. Payne Limestone, Lower Mississippian; Lake Cumberland, Kentucky, USA) 10
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 175
by James St. John

Fossiliferous limestone & fossiliferous shale (Skelley Member, Upper Pennsylvanian; Caldwell West outcrop, Ohio, USA) 21
by James St. John

Agnostoid trilobite packstone (Alum Shale Formation, Upper Cambrian; southern Sweden) 4
by James St. John

Historic Entrance (Mammoth Cave, Kentucky, USA) 44
by James St. John

Vuggy, sucrosic dolostone (Lockport Dolostone, Middle Silurian; National Lime & Stone Company Buckland Quarry, Auglaize County, Ohio, USA) 1
by James St. John

Karst & Columbus Limestone (Middle Devonian; Indian Village Canyon, Columbus, Ohio, USA) 8
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 164
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 184
by James St. John

Fossiliferous limestone (Waynesville Formation, Upper Ordovician; Miamisburg railroad cut, Ohio, USA) 1
by James St. John

Fossiliferous limestone with chert nodules (lower Boggs Member, Pottsville Group, Pennsylvanian; Rt. 93 roadcut north of Mt. Pleasant, Hocking County, Ohio, USA) 1
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 176
by James St. John

Nautiloid cephalopod (Corryville Member, McMillan Formation, Upper Ordovician; Flemingsburg South roadcut, Fleming County, Kentucky, USA) 4
by James St. John

Fossiliferous limestone (Columbus Limestone, Middle Devonian; Sullivant Quarry, Columbus, Ohio, USA) 35
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 188
by James St. John

Fossiliferous limestone (Columbus Limestone, Middle Devonian; Sullivant Quarry, Columbus, Ohio, USA) 6
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 180
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 186
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 187
by James St. John

Glacial grooves on limestone (Kelleys Island, Lake Erie, Ohio, USA) 132
by James St. John

Fossiliferous sandstone (Logan Formation, Lower Mississippian; eastern Ohio, USA) 5
by James St. John