Asteroid ray fragment (oral surface); 1 m from top of Zichor Formation (Coniacian, Upper Cretaceous), southern Israel.
Aulopora (a tabulate coral) from the Silica Shale (Middle Devonian) of northwestern Ohio.
Gryphaea sp. from the Cretaceous of Texas; left valve interior and exterior (same specimen).
Pycnodonte pulaskiensis from the Clayton Formation (Paleocene) of Mississippi.
Laevitrigonia gibbosa from the Portland Limestone Formation (Upper Jurassic), Isle of Portland, Dorset, England.
The early Middle Triassic bivalve Ramonalina (Makhtesh Ramon, southern Israel).
Thecideide brachiopod (T), sabellid worm tube (S) and bryozoans (B) on the shell of the bivalve Ctenostreon from the Upper Jurassic of Poland.
Elrathia kingii from the Wheeler Shale (Middle Cambrian), Utah.
Apiocrinites negevensis from the Matmor Formation, Middle Jurassic (Callovian), southern Israel.
The distinctive proximale of Apiocrinites negevesis; Matmor Formation; Middle Jurassic of southern Israel.
The Ordovician cystoid Echinosphaerites aurantium from northeastern Estonia.
Eucalyptocrinites calyx from the Kaugatuma Formation (Upper Silurian, Pridoli), Saaremaa, Estonia.
Calcite crystals inside a test of the cystoid Echinosphaerites aurantium (Middle Ordovician, northeastern Estonia).
Calcite cements in the Ordovician cystoid Echinosphaerites aurantium from northeastern Estonia.
Encrusting graptolite (Thallograptus sphaericola) on the cystoid Echinosphaerites aurantium (Middle Ordovician, northeastern Estonia).
Thallograptus sphaericola, a dendroid graptolite, attached to the cystoid Echinosphaerites aurantium; Ordovician of northeastern Estonia.
Pendeograptus fruticosus from the Bendigonian Australian Stage (Lower Ordovician; 477-474 mya) near Bendigo, Victoria, Australia. Two overlapping, three-stiped rhabdosomes.
A Middle Ordovician hardground from Utah with echinoderm holdfasts cemented to its upper surface.
Carbonate hardground with bryozoan and borings from the Upper Ordovician of northern Kentucky, USA.
Stigmatella personata; trepostome bryozoan encrusting the underside of a carbonate hardground; borings are Trypanites; Corryville Formation; Upper Ordovician; Mason County, Kentucky.
Longitudinal thin-section of Stigmatella personata; a trepostome bryozoan encrusting a carbonate hardground; Corryville Formation; Upper Ordovician; Mason County, Kentucky.
Cross-section of a carbonate hardground encrusted by oysters and bored by bivalves (Gastrochaenolites); Carmel Formation (Middle Jurassic) of southern Utah.
Middle Jurassic (Callovian) crinoid pluricolumnals (Apiocrinites) from the Matmor Formation in Hamakhtesh Hagadol, southern Israel (Locality C/W-608).
Prasopora, a trepostome bryozoan from the Ordovician of Iowa.
Fossils in Ordovician oil shale (kukersite), northern Estonia.
College of Wooster students collecting fossils; Ordovician of Indiana.
Aviculopecten subcardiformis from the Logan Formation, (Lower Carboniferous); Wooster, Ohio.
Syringothyris sp.; a spiriferid brachiopod from the Logan Formation (Lower Carboniferous) of Wooster, Ohio (internal molds).
Gastropod and attached mytilid bivalves on a Jurassic limestone bedding plane in southern Israel.
Peltoceras solidum ammonite from the Matmor Formation (Jurassic, Callovian) in the Matmor Formation, Makhtesh Gadol, Israel.
Hederelloids encrusting a brachiopod from the Devonian of Ohio.
Scanning electron microscope image of a hederelloid from the Devonian of Michigan.
Three hederelloid species on a Devonian rugose coral.
Halysites (Silurian tabulate coral).
Thin-section of Halysites (Silurian tabulate coral).
Ordovician fossils from Minnesota; brachiopods and bryozoans.
Receptaculitid, considered a member of the Order Dasycladales; Ordovician of Estonia.
Receptaculitid from the Kimmswick Limestone (Middle Ordovician) near Ozora, Missouri.
Receptaculitid underside showing merom structure.
Brown bodies in an Ordovician bryozoan.
Edrioasteroid (Cystaster stellatus) from the Ordovician of northern Kentucky.
Ostreolith ("oyster ball") from the Carmel Formation (Jurassic) of southwestern Utah.
Liostrea strigilecula on an ostreolith ("oyster ball") from the Carmel Formation (Jurassic) of southwestern Utah.
Ostreolith ("oyster ball") interior showing an aragonitic shell cast as the nucleus and Gastrochaenolites borings; Carmel Formation (Jurassic) of southwestern Utah.
Hyolithes cerops Walcott from the Spence Shale near Paris, Idaho (Middle Cambrian).
Haplophrentis carinatus from the Stephen Formation, Burgess Shale (Middle Cambrian), Burgess Pass, British Columbia, Canada.
Hyoliths from the Middle Ordovician of northern Estonia; these are internal molds.
Ordovician strophomenid brachiopod encrusted with bryozoans and inarticulate brachiopods (Petrocrania).
Petrocrania brachiopods attached to a strophomenid brachiopod; Upper Ordovician of southeastern Indiana.
Baculites specimen in the field; western South Dakota, Late Cretaceous. Part of the phragmocone and part of the body chamber visible.
Baculites showing sutures and remnant aragonite; western South Dakota, Late Cretaceous.
Close-up of a conulariid from the Mississippian of Indiana.
Conulariid from the Mississippian of Indiana.
Ichthyosaur vertebrae from the Sundance Formation (Jurassic) of Natrona County, Wyoming.
Mosasaur skeleton (Cretaceous); Natural History Museum of Maastricht, The Netherlands.
Mosasaur front paddle (Cretaceous); Natural History Museum of Maastricht, The Netherlands.
Nummulitid foraminiferans from the Eocene near Al Ain, United Arab Emirates. Microspheric and megalospheric specimens shown.
A broken concretion with fossils inside; Late Cretaceous near Ekalaka, Montana.
Matthevia, a Late Cambrian polyplacophoran from the Hellnmaria Member of the Notch Peak Limestone, Steamboat Pass, southern House Range, Utah.
Gorgonian holdfast on a Miocene limestone surface, Czech Republic.
Octocoral holdfast on a limestone substrate (Pleistocene, Sicily); collected by A. Vertino.
Crinoid columnals (Isocrinus nicoleti) from the Middle Jurassic Carmel Formation at Mount Carmel Junction, Utah.
Isocrinus nicoleti columnals from the Carmel Formation (Middle Jurassic) of Kane County, Utah.
Amplexograptus from the Ordovician near Caney Springs, Tennessee.
Viburnum lesquereuxii leaf with insect damage; Dakota Sandstone (Cretaceous) of Ellsworth County, Kansas.
Lepidodendron external mold from the Upper Carboniferous of Ohio.
Stigmaria, a root of Lepidodendron. Upper Carboniferous of northeastern Ohio.
Lepidodendron root (Stigmaria) with rootlets attached. Upper Carboniferous of northeastern Ohio.
Fossil seed fern (Neuropteris ovata Hoffmann) from the Late Carboniferous of northeastern Ohio.
Trigonia sp. from the Glen Rose Formation (Cretaceous) near Austin, Texas.
Tentaculitids from the Devonian of Maryland. Scale bar is 5.0 mm.
Tabulate coral (a syringoporid); Boone Limestone (Lower Carboniferous) near Hiwasse, Arkansas.
Favosites sp. from the Upper Ordovician of southern Indiana.
Sagittal cross-section of Favosites showing communication pores between the corallites. Upper Ordovician of southern Indiana.
Scleractinian coral from the Matmor Formation (Jurassic, Callovian) of Makhtesh Gadol, Israel.
Rudist bivalves (Vaccinites) from the Cretaceous of the Omani Mountains, United Arab Emirates.
Platystrophia ponderosa, Maysvillian (Upper Ordovician) near Madison, Indiana.
Phacopid trilobite from the Devonian of Ohio.
Silurian Pentamerus brachiopod.
Solitary rugose coral (Grewingkia) in three views; Ordovician, southeastern Indiana.
Tullimonstrum gregarium in a concretion from the Mazon Creek (Upper Carboniferous), Illinois.
Inoceramus from the Cretaceous of South Dakota.
Internal mold of a nautiloid from the Upper Ordovician of northern Kentucky. Note the encruster over the mold.
Crinoid holdfasts and bryozoans on an Upper Ordovician cobble from northern Kentucky.
Protaraea richmondensis, a heliolitid coral; Cincinnatian (Upper Ordovician) of southeastern Indiana.
Zygospira modesta, atrypid brachiopods, preserved in their original positions on a trepostome bryozoan; Cincinnatian (Upper Ordovician) of southeastern Indiana.
Hypostome of the trilobite Isotelus (Ordovician of southern Ohio).
Rhynchotrema dentatum, a brachiopod from the Cincinnatian (Upper Ordovician) of southeastern Indiana.
Cladocora from the Pliocene of Cyprus.
Aporrhais from the Pliocene of Cyprus.
Petaloconchus (vermetid gastropod) attached to the coral Cladocora; Nicosia Formation (Pliocene); Cyprus.
Gastropod and attached wormtube from the Pliocene of Cyprus.
Turritella cingulifera from the Pliocene of Cyprus.
Spondylus from the Pliocene of Cyprus.
Spondylus from the Pliocene of Cyprus.
Diodora italica from the Pliocene of Cyprus.
Dentalium from the Pliocene of Cyprus.
Anadara from the Pliocene of Cyprus.
Amusium cristatum from the Pliocene of Cyprus.
Belemnite from the very top of the Zohar Formation (Jurassic) near Neve Atif, the Golan.
Anomalocaris from the Mt. Stephen Trilobite Beds, Middle Cambrian, near Field, British Columbia, Canada.
Anomalocaridid from the Walcott Quarry, Burgess Shale, Middle Cambrian, British Columbia, Canada.
Scenella from the Burgess Shale, Middle Cambrian, Walcott Quarry, near Field, British Columbia.
Vauxia (sponge) from the Walcott Quarry of the Burgess Shale (Middle Cambrian) near Field, British Columbia, Canada.
Ottoia prolifica (priapulid worm) from the Walcott Quarry of the Burgess Shale (Middle Cambrian) near Field, British Columbia, Canada.
Olenoides serratus from the Mt. Stephen Trilobite Beds (Middle Cambrian) near Field, British Columbia, Canada.
Stromatolites (Pika Formation, Cambrian) near Helen Lake, Banff National Park, Canada.
Stromatolites in the Soeginina Beds (Paadla Formation, Ludlow, Silurian) near Kübassaare, Saaremaa, Estonia.
Quinqueloculina sp. from Donegal Bay, Ireland.
Triticites sp. cross-section; Plattsmouth Chert; Red Oak, Iowa; Permian.
Bolboporites, Frizy Member, Volkhov Formation, near St. Petersburg, Russia (Middle Ordovician, Volkhovian).
Bolboporites, Frizy Member, Volkhov Formation, near St. Petersburg, Russia (Middle Ordovician, Volkhovian).
Exogyra costata from the Owl Creek Formation, Late Cretaceous, near Ripley, Mississippi.
Articulated ostracod valves in cross-section from the Permian of central Texas.
Strophomenid brachiopod valve with an encrusting cornulitid (Upper Ordovician, southeastern Indiana).
Cornulitids on a bryozoan substrate; Bellevue Member, Grant Lake Formation; Upper Ordovician of northern Kentucky.
Cornulitid on a strophomenid brachiopod valve (Upper Ordovician, southeastern Indiana).
Discoscaphites iris, Owl Creek Formation (Upper Cretaceous), Ripley, Mississippi.
Scapanorhynchus texanus, Menuha Formation (Upper Cretaceous), southern Israel. Collected by Andrew Retzler.
Cretaceous shark teeth (mostly Scapanorhynchus) from the Menuha Formation (Upper Cretaceous), southern Israel.
Hadrodus prisca, Menuha Formation (Upper Cretaceous), southern Israel. Collected by Andrew Retzler.
Microconchid on a Middle Devonian (Givetian) brachiopod from the Silica Shale, northwestern Ohio.
Helicoconchus elongatus, a microconchid from the Lower Permian of Texas.
Helicoconchus elongatus, a microconchid from the Lower Permian of Texas (showing branching).
Helicoconchus elongatus, a microconchid from the Lower Permian of Texas (view of branching aggregation of tubes).
Microconchid (Palaeoconchus angulatus) on a brachiopod shell from the Potter Farm Formation (Middle Devonian, Givetian) in Alpena, Michigan.
Stromatoporoid side view showing laminae and pillars; Columbus Limestone (Devonian), Kelleys Island, Ohio.
Stromatoporoid top view showing mamelons; Columbus Limestone (Devonian), Kelleys Island, Ohio.
Platyceratid (Palaeocapulus acutirostre) snail on a crinoid calyx (Logan Formation; Mississippian of Ohio).
Cross-section of a Lower Carboniferous crinoid with an in situ parasitic platyceratid gastropod.
Crinoid stem replaced by marcasite in a siderite concretion; Lower Carboniferous.
Platyceras pulcherrimum from the Logan Formation (Mississippian) of Wooster, Ohio.
Encrusted hiatus concretion from the Kope Formation (Upper Ordovician) of Covington, Kentucky. Encrusters include bryozoans and crinoids.
Belemnites from the Jurassic of Wyoming.
Bryozoans encrusting the right valve interior of an oyster from the Coon Creek Beds of the Ripley Formation (Upper Cretaceous) near Blue Springs, Mississippi.
Entobia borings and the cyclostome bryozoan Voigtopora thurni on an oyster valve from the Coon Creek Beds of the Ripley Formation (Upper Cretaceous) near Blue Springs, Mississippi.
Sphenothallus holdfast from the Kope Formation (Upper Ordovician), Gunpowder Creek, Kentucky.
Merycoidodon skull right side (Oligocene of Nebraska).
Merycoidodon skull left side (Oligocene of Nebraska).
Mammut americanum tooth, side view (Pleistocene, Holmes County, Ohio).
Mammut americanum tooth surface (Pleistocene, Holmes County, Ohio).
Mammuthus tooth, side view (Pleistocene, Holmes County, Ohio).
Mammuthus tooth surface (Pleistocene, Holmes County, Ohio).
Hercosestria cribrosa Cooper & Grant 1969 (Roadian, Guadalupian, Middle Permian); Glass Mountains, Texas.
Hercosestria cribrosa Cooper & Grant 1969 (Roadian, Guadalupian, Middle Permian); Glass Mountains, Texas.
Hercosestria cribrosa Cooper & Grant 1969 (Roadian, Guadalupian, Middle Permian); Glass Mountains, Texas.
Tentaculitid from the New Creek Limestone (Lochkovian, Early Devonian) of New Creek, West Virginia.
Coralliophaga coralliophaga (Gmelin, 1791) from Cockburntown Reef, San Salvador, The Bahamas (Pleistocene, Eemian).
Pleurodictyum americanum Roemer from the Kashong Shale (Hamilton Group), Middle Devonian (Givetian) of Livingston County, New York.
Pleurodictyum americanum Roemer (reverse) from the Kashong Shale (Hamilton Group), Middle Devonian (Givetian) of Livingston County, New York.
Side view of a xenophorid gastropod.
Aperture view of a xenophorid gastropod.
Hexactinellid sponge on a xenophorid gastropod.
Leptodus americanus from the Word Limestone (Permian) in Hess Canyon, Texas.
Baculites internal mold with all aragonite dissolved away.
Eurypterus from the Bertie Waterlime (Upper Silurian) of New York.
Marella splendens from the Burgess Shale (British Columbia, Canada, Middle Cambrian).
Lower mandible of Gigantopithecus blacki (cast) in the collections of The College of Wooster.
Crassostrea gigantissima (Finch, 1824) from the Eocene of Texas.
Crassostrea gigantissima (Finch, 1824) right valve interior (Eocene of Texas).
Pygites diphyoides (d'Orbigny, 1849) from Hauterivian (Lower Cretaceous) of Cehegin, Murcia, Spain.
Eroded Jurassic plesiosaur vertebral centrum found in the Lower Cretaceous Faringdon Sponge Gravels in Faringdon, England. An example of a remanié fossil.
Calcareous sponge with an encrusting crinoid from the Matmor Formation (Jurassic, Callovian) of Makhtesh Gadol, Israel.
Fusulinids from the Topeka Limestone (Virgilian, Upper Carboniferous) of Greenwood County, Kansas.
Burmirhynchia jirbaensis from the Matmor Formation (Jurassic, Callovian) of Makhteash Gadol, Israel.
Mammut americanum (American Mastodon) tusk from the Pleistocene of Holmes County, Ohio.
Peronopora from the Whitewater Formation of eastern Indiana.
Mucrospirifer mucronatus from the Silica Shale Formation (Middle Devonian) of Paulding County, Ohio.
The large ostracod Herrmannina from the Silurian (Ludlow) Soeginina Beds (Paadla Formation) on eastern Saaremaa Island, Estonia.
Silicified fossils from the Road Canyon Formation (Middle Permian of Texas).
Macrophthalmus latreillei, a Pleistocene sentinel crab from northern Australia.
Pattersonia ulrichi Rauff, 1894; an Ordovician hexactinellid sponge from near Cincinnati, Ohio.
Ophiopetra lithographica from the Lower Hienheim Beds (Lower Tithonian, Upper Jurassic) near Regensburg, Germany.
Praeexogyra acuminata (Sowerby, 1816) from the Sharp's Hill Formation (Middle Bathonian, Middle Jurassic) near Moreton-in-Marsh, Gloucestershire, England.
Otodus obliquus teeth from the Eocene near Khouribga, Morocco.
Coenothyris oweni from the Middle Triassic (Anisian) lower Saharonim Formation, Har Gevanim, southern Israel.
Onchopristis numidus from Kem Kem, Morocco; Tegana Formation (Cenomanian, Cretaceous).
Hibolites hastatus from the Jurassic near Moneva Teruel, Spain. Note the barnacle borings (Rogerella).
Deinosuchus hatcheri at the Natural History Museum of Utah.
Turritella from the Pleistocene of Sicily.
Keratoisis melitensis (Goldfuss, 1826) from the Lower Pleistocene of Cape Milazzo, Sicily, Italy. An octocoral of the Family Isididae.
Paracenoceras Spath, 1927 from the Matmor Formation (Middle Jurassic, Callovian) of Hamakhtesh Hagadol, southern Israel.
Galls with perforations on a crinoid stem (Apiocrinites negevensis) from the Middle Jurassic of southern Israel.
Discohelix tunisiensis, a gastropod from the Matmor Formation (Middle Jurassic) of southern Israel.
Strophodonta demissa from the Silica Shale (Middle Devonian) of Michigan.
Terebratula maugerii Boni, 1933. A terebratulid brachiopod from the Upper Miocene of Cordoba, Spain.
Septastrea marylandica, a scleractinian coral encrusting pagurized gastropod shells (Pliocene of Florida).
Thalassinoides burrow system in the Sherborne Building Stone (Jurassic, Bajocian) of Dorset, England; slab cut parallel to bedding.
Thalassinoides burrow system in the Sherborne Building Stone (Jurassic, Bajocian) of Dorset, England; slab cut perpendicular to bedding.
Borings in an Upper Ordovician bryozoan, Bellevue Formation, northern Kentucky; polished cross-section.
Entobia gallery; a boring produced by a clionaid sponge in a bivalve shell.
Gastrochaenolites (G) and Entobia (E) in limestone cobble from the Los Banós Formation, Upper Miocene, SE Spain.
Naticid boring in Stewartia from the Calvert Formation, Zone 10, Calvert Co., MD (Miocene).
Trace fossils from the Bull Fork Formation (Upper Ordovician); Caesar Creek, Ohio.
Helminthopsis ichnosp.; a trace fossil from the Logan Formation (Lower Carboniferous) of Wooster, Ohio.
Thalassinoides burrows produced by crustaceans; Middle Jurassic, Makhtesh Qatan, southern Israel.
Asteriacites, a trace fossil of an ophiuroid echinoderm; Carmel Formation (Jurassic), near Gunlock, Utah.
Asteriacites (sea star trace fossil) from the Devonian of northeastern Ohio.
Skolithos trace fossil.
Rusophycus trace fossil from the Ordovician of southern Ohio.
Zoophycos trace fossil from the Mississippian of northern Kentucky.
Viburnum lesquereuxii leaf with insect damage; Dakota Sandstone (Cretaceous) of Ellsworth County, Kansas.
Catellocaula vallata bioclaustration; Ordovician of Ohio.
Cretaceous hardground from Texas with encrusting oysters and borings.
Gastrochaenolites borings in a Middle Jurassic hardground, southern Utah.
Cross-section of a carbonate hardground encrusted by oysters and bored by bivalves (Gastrochaenolites); Carmel Formation (Middle Jurassic) of southern Utah.
Carbonate hardground; Ora Formation, Upper Cretaceous (Turonian), southern Israel.
Gastrochaenolites in a coral, Matmor Formation (Jurassic), Israel.
Rogerella in a crinoid stem, Matmor Formation (Jurassic), Israel.
Entobia, a modern boring formed by clionaid sponges.
Entobia sponge borings and the cyclostome bryozoan Voigtopora thurni on an oyster valve from the Coon Creek Beds of the Ripley Formation (Upper Cretaceous) near Blue Springs, Mississippi.
Numerous borings in a Cretaceous cobble, Faringdon, England.
Petroxestes pera borings in an Upper Ordovician hardground, Whitewater Formation, southern Ohio.
Petroxestes pera borings in a hardground; Whitewater Formation (Upper Ordovician) of southern Ohio.
Trypanites borings in an Upper Ordovician hardground, southeastern Indiana.
Sponge borings and encrusters on a modern bivalve shell, North Carolina.
Cross-section of a Jurassic rockground; borings include Gastrochaenolites (some with boring bivalves in place) and Trypanites; Mendip Hills, England.
Trypanites borings in an Upper Ordovician hardground from northern Kentucky.
Trypanites borings in an Upper Ordovician hardground from northern Kentucky. The borings are filled with diagenetic dolomite (yellowish). Note that the boring on the far right cuts through a shell in the matrix.
Teredolites borings in a modern wharf piling; the work of bivalves known as "shipworms".
Teredolites; an ichnogenus formed by boring bivalves in wood.
Cross-section of mammoth footprints at The Mammoth Site, Hot Springs, South Dakota.
Eubrontes, a dinosaur footprint in the Lower Jurassic Moenave Formation at the St. George Dinosaur Discovery Site at Johnson Farm, southwestern Utah.
Gigandipus, a dinosaur footprint in the Lower Jurassic Moenave Formation at the St. George Dinosaur Discovery Site at Johnson Farm, southwestern Utah.
Cameloid footprint (convex hyporelief) from the Barstow Formation (Miocene) of Rainbow Basin, California.
Petalichnus, trilobite walking traces. Devonian of northeastern Ohio.
Rusophycus and other trace fossils from the Gog Group, Early Cambrian, Lake Louise, Alberta, Canada.
Lockeia from the Dakota Formation (Upper Cretaceous).
Lockeia from the Chagrin Shale (Upper Devonian) of northeastern Ohio.
Gastroliths from Jurassic strata near Starr Springs, Utah.
Ropalonaria venosa, an etching trace fossil of a Late Ordovician ctenostome bryozoan; Cincinnatian of southeastern Indiana.
Gnathichnus pentax echinoid trace fossil on an oyster from the Cenomanian of Hamakhtesh Hagadol, southern Israel.
Hibolites hastatus from the Jurassic near Moneva Teruel, Spain. Note the barnacle borings (Rogerella).
Entobia, a sponge boring from the Prairie Bluff Chalk Formation (Maastrichtian, Upper Cretaceous) of Starkville, Mississippi. Preserved as a cast of the excavations.
Geopetal structure in bivalve boring in coral; bivalve shell visible; Matmor Formation (Middle Jurassic), southern Israel.
Syringothyris external mold with borings; Logan Formation (Carboniferous); Wooster, Ohio.
Encrinite within the Carmel Formation (Middle Jurassic) exposed at Mt. Carmel Junction, Utah.
Intraclasts (marked "In") in the Carmel Formation (Middle Jurassic) near Gunlock, Utah.
Corryville Formation (Upper Ordovician, Katian) exposed in Maysville, Kentucky.
Fossiliferous slab of the Whitewater Formation (Upper Ordovician) exposed near Richmond, Indiana.
Shakopee Formation (Lower Ordovician) exposed in Hernke's Rock Quarry near Cannon Falls, SE Minnesota.
Platteville Limestone (Upper Ordovician) exposed in Decorah, Iowa.
Bull Fork Formation (Richmondian, Upper Ordovician) exposed in Caesar Creek State Park, southern Ohio.
Hunstanton Formation ("Red Chalk") exposed south of Speeton Cliffs, North Yorkshire.
Passage Beds (Jurassic) at Filey Brigg, North Yorkshire.
Lower Lias sequence exposed at Nash Point, Glamorgan, Wales.
Carbonate hardground with corals, bryozoans and brachiopods from the Liberty Formation (Upper Ordovician), southern Ohio.
Crinoid columnals (Isocrinus nicoleti) in a biosparite/grainstone from the Middle Jurassic Carmel Formation at Mount Carmel Junction, Utah. Scale in mm.
Ripplemarks in a biosparite/grainstone from the Middle Jurassic Carmel Formation, southwestern Utah.
Ooids in limestone of the Carmel Formation (Middle Jurassic) of southwestern Utah.
Fossils ooimmured in ooids from the Carmel Formation (Middle Jurassic of Utah).
Ooids in thin-section; Carmel Formation (Middle Jurassic) of southern Utah.
Ooids on the surface of a limestone; Carmel Formation (Middle Jurassic) of southern Utah.
Ooids from a beach on Joulter's Cay, The Bahamas.
Pisolites in the Conococheague Limestone (Upper Cambrian) of eastern Pennsylvania.
Coral sand from a beach on Aruba.
Gastrochaenolites borings in a Middle Jurassic hardground, Carmel Formation, southern Utah.
Cross-section of a carbonate hardground encrusted by oysters and bored by bivalves (Gastrochaenolites); Carmel Formation (Middle Jurassic) of southern Utah.
Ordovician limestones, Tennessee.
Outcrop of Upper Ordovician rubbly limestone and shale, southern Indiana.
Thin-section of peloid sediment and sparry calcite cement in a recrystallized bivalve shell showing "way up" (thus a geopetal structure); limestone of the Bird Spring Formation (Carboniferous) of southern Nevada.
Peloids and a brachiopod shell visible in a limestone thin-section; Bird Spring Formation (Carboniferous) of southern Nevada.
Cross-section of a Jurassic rockground; borings include Gastrochaenolites (some with boring bivalves in place) and Trypanites; Mendip Hills, England.
Thrombolites in the Purbeck Formation (Jurassic), Isle of Portland, Dorset, England.
Cross-section of an Upper Ordovician hardground from Ohio. The light-colored vertical elements are Trypanites borings filled with dolomite.
A Middle Ordovician hardground from Utah with echinoderm holdfasts cemented to its upper surface.
Cretaceous hardground from Texas with encrusting oysters and borings.
Carbonate hardground with encrusting bryozoan; Kanosh Formation (Middle Ordovician) of Utah; scale in mm.
Portland Admiralty Roach from a quarry face on the Isle of Portland, Dorset.
Portland stone quarry, Isle of Portland, Dorset.
Holocene eolianite on Long Island, Bahamas.
Oncolites in the Alamo impact breccia (Guilmette Formation, Late Devonian, Frasnian) near Hancock Summit, Pahranagat Range, Nevada.
Atlantic shore of Long Island, The Bahamas.
Northern rocky shore of Great Inagua exposing Pleistocene reefal limestones.
Concretion from the Cretaceous of western South Dakota.
A broken concretion with fossils inside; Late Cretaceous near Ekalaka, Montana.
Bored hiatus concretions at the base of the Menuha Formation (Upper Cretaceous), the Negev, southern Israel.
Coquina from Florida. The scale bar is in mm.
Close-up of coquina from Florida.
Bioclasts in an Ordovician limestone; T = trilobite; E = echinoderm (crinoid).
Scientific papers on hardgrounds by period. Serves as a proxy for hardground abundance over time. Calcite and aragonite sea intervals are plotted on the time axis.
Eemian erosion surface in a fossil coral reef on Great Inagua, The Bahamas. Foreground shows corals truncated by erosion; behind the geologist is a post-erosion coral pillar which grew on the surface after sea level rose again.
Lithographic limestone from the Gerofit Formation (Turonian) north of Makhtesh Ramon, southern Israel; a variety of Jerusalem Stone (meleke).
Brassfield Limestone (Early Silurian) near Fairborn, Ohio, USA. An encrinite.
Broken surface of Brassfield Limestone (Early Silurian) near Fairborn, Ohio, showing sparry calcite cement.
Encrinite from the Brassfield Formation (Silurian) near Fairborn, Ohio.
Outcrop of Brassfield Limestone (Early Silurian) in Oakes Quarry near Fairborn, Ohio, USA.
Fossiliferous limestone slab from the Liberty Formation (Upper Ordovician) of Caesar Creek State Park near Waynesville, Ohio.
Hiatus concretion encrusted with crinoids and bryozoans; Kope Formation (Upper Ordovician), Gunpowder Creek, Kentucky.
Ripley Formation (Maastrichtian, Upper Cretaceous) rockground exposed near Greenville, Alabama.
Prairie Bluff Chalk Formation (Maastrichtian, Upper Cretaceous) in Starkville, Mississippi.
Paleontologist studying the Reynales Formation (Silurian) in Hickory Corners, New York.
Dundee Falls, Ohio; Dundee Sandstone (Upper Carboniferous).
Basal conglomerate of the Upper Cretaceous Iron Springs Formation (dark) overlying the light carbonates of the Carmel Formation (Middle Jurassic). Near Gunlock, southwestern Utah.
Mudcracks in the Carmel Formation (Middle Jurassic) near Gunlock, Utah.
Sandy conglomerate in the Hazeva Formation (Miocene) of southern Israel.
Monument to the 20th Massachusetts Infantry on the Gettysburg battlefield; Roxbury Puddingstone.
Roxbury Conglomerate used in the 20th Massachusetts Infantry monument on the Gettysburg Battlefield.
Rochester Shale (Silurian, Wenlockian) exposed in the Niagara Gorge, New York.
Kinneyia-like structure in the Grimsby Foramtion (Silurian) exposed in Niagara Gorge, New York.
Triassic wadi deposit near Ogmore-By-Sea, Wales. Clasts are Carboniferous limestone.
Osgodby Formation (Middle Jurassic) exposed on the shore of Cayton Bay, North Yorkshire.
Beach cobbles at Nash Point, South Wales.
Aztec Sandstone (Lower Jurassic) at Red Rock Canyon National Conservation Area near Las Vegas, Nevada.
Middle and Upper Triassic shallow marine sequence, Makhtesh Ramon, Israel.
Joints in the Almo Pluton, City of Rocks National Reserve, Idaho.
Cummingsville Formation (Upper Ordovician) exposed in Decorah, Iowa. The Cummingsville is the brown upper unit; the Decorah Formation is below.
Decorah Formation (Upper Ordovician) exposed in Decorah, Iowa. The Decorah is gray; above it is the brown Cummingsville Formation.
Glacial pothole in basalt on the St. Croix River at Interstate State Park, Wisconsin.
Waynesville Formation (Upper Ordovician) exposed near St. Leon, Indiana.
Rainbow Basin Syncline near Barstow, California.
Barstow Formation (Miocene) in Owl Canyon near Barstow, California.
Syncline in the lower parking lot of Calico Ghost Town near Barstow, California.
Anticline in the Barstow Formation (Miocene) at Calico Ghost Town near Barstow, California.
Fossil Mountain, Utah; Ordovician shales and limestones.
Natural arch in Timna Valley, Negev Desert, Israel.
Timna Valley, Negev Desert, Israel.
Ramon Fault on the southern side of Makhtesh Ramon, Israel.
Northern coast of Saaremaa, Estonia.
Raised beach on the northern coast of Saaremaa, Estonia.
Wave-cut platforms from Lake Bonneville preserved on Antelope Island, Great Salt Lake, Utah.
U-shaped valley carved by a glacier; Little Cottonwood Creek Valley, Wasatch Mountains, Utah.
Natural Bridge at Bryce Canyon National Park. Actually an arch.
Carmel Formation (Middle Jurassic) near Gunlock, southwestern Utah. The dark unit at the top is the equivalent of the Cretaceous Dakota conglomerate.
Carmel Formation (Middle Jurassic) exposed at Gunlock Reservoir, southwestern Utah.
Late Cretaceous cold seep deposit in the Pierre Shale, southwest South Dakota.
Eemian erosion surface in a fossil coral reef on Great Inagua, The Bahamas. Foreground shows corals truncated by erosion; behind the geologist is a post-erosion coral pillar which grew on the surface after sea level rose again.
Disconformity with the Lower Cretaceous Edwards Formation overlying a Lower Permian limestone; hiatus is about 165 million years; Texas.
Walcott Quarry of the Burgess Shale (Middle Cambrian, British Columbia).
Ventifact from the Mojave Desert near Barstow, California.
Soft sediment deformation in Dead Sea sediments, Israel. Possibly a seismite.
A teepee structure in modern halite deposits along the western shore of the Dead Sea, Israel.
Geopetal structure in bivalve boring in coral; bivalve shell visible; Matmor Formation (Middle Jurassic), southern Israel.
Whitewater Formation (Upper Ordovician) exposed in a roadcut near Richmond, Indiana.
Liberty Formation (Upper Ordovician) exposed north of Brookville, Indiana.
Grant Lake Formation (Upper Ordovician); Idlewild Bypass (KY-8) in Boone County, Kentucky.
Meadville Shale Member of the Cuyahoga Formation (Lower Carboniferous) exposed in Lodi, Ohio.
Cross-beds in the Grimsby Formation (Silurian) exposed in Niagara Gorge, New York.
Outline of Templar circular church within Temple Church ruins, Bristol.
Front building detail of Bristol City Museum and Art Gallery.
Sherborne Castle, Dorset, England.
Cerne Abbey in Cerne Abbas, Dorset, England.
Cerne Abbey Guesthouse.
Baptismal font of Dundry stone in Church of St. Margaret, Hinton Blewett, Somerset, England.
Mouth of the River Bride at Burton Bradstock, Dorset, England.
Rotunda Museum in Scarborough, North Yorkshire, England.
Whitby Abbey, North Yorkshire.
St. Hilda monument detail in Whitby. Note ammonites at feet.
The Brigg at Filey Brigg, North Yorkshire, England.
Filey, North Yorkshire, from Filey Brigg.
Speeton Clay (Lower Cretaceous) at Reighton Sands, North Yorkshire.
WWII pillbox on eroding Boulder Clay, Filey Bay, North Yorkshire.
River Ouse in York from Skeldergate Bridge.
Southwestern portion of York Minster.
Erosion of the Boulder Clay (Pleistocene) along cliffs of Filey Bay, Yorkshire, England.
The Grand Hotel in Scarborough, North Yorkshire, England.
Ewenny Priory interior, south Wales.
Ewenny Priory exterior, south Wales.
Mouth of the River Ogmore, south Wales.
Carboniferous/Jurassic unconformity surface at Tedbury Camp, near Great Elm, Somerset.
Carboniferous Limestone exposed at Tedbury Camp, Somerset.
Carboniferous Limestone exposed at Ogmore-By-Sea, Wales. Carboniferous/Jurassic unconformity.
Nash Point, Monknash Coast, Vale of Glamorgan, south Wales.
Lower Lias rocks exposed at Lavernock Point, south Wales.
Pyramidal tomb of the stonemason John Bryan in Painswick, Gloucestershire.
Devil's Chimney, Leckhampton Hill, Gloucestershire.
Inferior Oolite (Jurassic) at Leckhampton Hill, Gloucestershire.
Inferior Oolite (Doulting Stone) at Doulting Stone Quarry, England.
Talley Abbey (Ceredigion, Wales, UK).
Standing Stones of Stenness, a neolithic stone circle on Orkney Mainland.
Dunnet Head view, Scotland. Rocks are the Old Red Sandstone.
Armeria maritima (Thrift) at Dunnet Head, Scotland.
Dunnet Head Lighthouse, northern Scotland.
Merchants Street, Scarborough, England. Scarborough Castle on skyline.
Filey, North Yorkshire. View of seaside from the south.
Westland Road in the Bogside, viewed from the city wall (July 31, 2007).
H-Block Monument in the Free Derry area of the Bogside, Derry; in memory of the hunger strikers in the H-Block of Long Kesh prison in 1981.
The Red Lion Pub in St. Columb Major, Cornwall, England.
The oldest remaining Glebe house, St. Columb Major, Cornwall, England.
St Columb Church, Cornwall, England.
Portland's cliffs and quarries, England.
Portland stone quarry, Isle of Portland.
Chesil Beach viewed from the Isle of Portland.
Renault FT 17 tank in Bovington Tank Museum.
The remains of a granary at a Roman fort on Hadrian's Wall near Housesteads, England.
Castle an Dinas as viewed from St. Columb Major, Cornwall, England.
St. Columb Major, Cornwall, England, as viewed from Castle an Dinas.
Statue of Euclid in the Oxford University Museum of Natural History.
George III statue in Weymouth, England.
Plague plaque in Weymouth, England.
Moot Hall, Aldeburgh, Suffolk, England.
Sundial on Moot Hall, Aldeburgh, Suffolk, England.
Coastline at Aldeburgh, Suffolk, England.
World War I memorial in Leeds, England.
Malton Oolite (Upper Jurassic) at Ravenswick Quarry, Yorkshire.
Palaeontological Association field trip to Spaunton Quarry, Yorkshire (December 2014). The main rock unit is the Coralline Oolite Formation (Upper Jurassic).
Northern rocky shore of Great Inagua exposing Pleistocene reefal limestones.
Grocery store in Matthew Town, Great Inagua, The Bahamas.
Old prison in Matthew Town, Great Inagua, The Bahamas.
Window in old prison in Matthew Town, Great Inagua, The Bahamas.
Eemian erosion surface in a fossil coral reef on Great Inagua, The Bahamas. Foreground shows corals truncated by erosion; behind the geologist is a post-erosion coral pillar which grew on the surface after sea level rose again.