Mark A. Wilson
Contributing to Wikipedia since 9 May 2007.
Crinoid columnals (Isocrinus nicoleti) in a biosparite/grainstone from the Middle Jurassic Carmel Formation at Mount Carmel Junction, Utah. Scale in mm.
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Ooids in thin-section; Carmel Formation (Middle Jurassic) of southern Utah.
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Ooids on the surface of a limestone; Carmel Formation (Middle Jurassic) of southern Utah.
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Gastrochaenolites borings in a Middle Jurassic hardground, Carmel Formation, southern Utah.
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Cross-section of a carbonate hardground encrusted by oysters and bored by bivalves (Gastrochaenolites); Carmel Formation (Middle Jurassic) of southern Utah.
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Ordovician limestones, Tennessee.
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Cross-section of a Jurassic rockground; borings include Gastrochaenolites (some with boring bivalves in place) and Trypanites; Mendip Hills, England.
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Cross-section of an Upper Ordovician hardground from Ohio. The light-colored vertical elements are Trypanites borings filled with dolomite.
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A Middle Ordovician hardground from Utah with echinoderm holdfasts cemented to its upper surface.
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Cretaceous hardground from Texas with encrusting oysters and borings.
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Carbonate hardground with encrusting bryozoan; Kanosh Formation (Middle Ordovician) of Utah; scale in mm.
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Portland Admiralty Roach from a quarry face on the Isle of Portland, Dorset.
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Holocene eolianite on Long Island, Bahamas.
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Oncolites in the Alamo impact breccia (Guilmette Formation, Late Devonian, Frasnian) near Hancock Summit, Pahranagat Range, Nevada.
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Atlantic shore of Long Island, The Bahamas.
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Northern rocky shore of Great Inagua exposing Pleistocene reefal limestones.
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Concretion from the Cretaceous of western South Dakota.
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A broken concretion with fossils inside; Late Cretaceous near Ekalaka, Montana.
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Coquina from Florida. The scale bar is in mm.
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Close-up of coquina from Florida.
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Bioclasts in an Ordovician limestone; T = trilobite; E = echinoderm (crinoid).
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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.
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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.
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Middle and Upper Triassic shallow marine sequence, Makhtesh Ramon, Israel.
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Middle Triassic marginal marine sequence, southwestern Utah.
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Sand blowing on the Kelso Dunes, California.
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Loess deposits in northern Patagonia, Argentina.
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Heavy minerals (dark) in a quartz beach sand (Chennai, India).
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Basal conglomerate from the Cambrian of the Black Hills, South Dakota.
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Badlands of Hell's Half-Acre in Natrona County, Wyoming.
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Sand dune on the Sinai Peninsula.
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Centripetal mudcracks in the Lower Jurassic Moenave Formation at the St. George Dinosaur Discovery Site at Johnson Farm, southwestern Utah.
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Sand from Pismo Beach, California.
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Sand from Coral Pink Sand Dunes State Park, Utah.
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Wadi sediments from the Barstow Formation (Miocene), Rainbow Basin, California.
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Cross-section through a sample of the Old Red Sandstone showing quartz and chert pebbles; central England; scale bar is 10 mm.
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Bedding plane of Old Red Sandstone with quartz and chert pebbles; central England; scale bar is 10 mm.
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Holocene wadi deposits in a modern wadi north of Phoenix, Arizona.
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Outcrop of Ordovician oil shale (kukersite), northern Estonia.
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Cretaceous laterite exposed in Makhtesh Gadol, Israel.
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Salt crystal cast in the Carmel Formation (Middle Jurassic), southwestern Utah.
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Cobble encrusted with halite from the western shore of the Dead Sea, Israel.
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Pebbles cemented with halite on the western shore of the Dead Sea, Israel.
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Ripplemarks in a siltstone (Carmel Formation, Middle Jurassic, near Gunlock, Utah).
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Banded Iron Formation specimen from Upper Michigan.
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Oxford Clay (Jurassic) exposed near Weymouth, England.
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Close-up of granite in Chennai, India.
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Obsidian talus, Obsidian Dome, California.
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Holocene volcano near Veyo, Utah.
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Cinders from a Pleistocene cinder cone, San Bernardino Valley, southeastern Arizona.
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Spherulites in rhyolitic ash, Hailstone Trail, Echo Canyon, Chiricahua Mountains, Arizona.
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Hoodoos of rhyolite in Chiricahua National Monument, southeastern Arizona.
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Gabbroic xenolith in a granite; eastern Sierra Nevada, Rock Creek Canyon, California.
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Gabbro as a xenolith in a granite, eastern Sierra Nevada, Rock Creek Canyon, California.
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Potassium feldspar crystals in a granite, eastern Sierra Nevada, Rock Creek Canyon, California.
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Pegmatitic granite, Rock Creek Canyon, eastern Sierra Nevada, California.
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Gabbro specimen; Rock Creek Canyon, eastern Sierra Nevada, California.
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Close-up of gabbro specimen; Rock Creek Canyon, eastern Sierra Nevada, California.
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Mississippian marble in Big Cottonwood Canyon, Wasatch Mountains, Utah.
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Rainbow Basin Syncline near Barstow, California.
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Fossil Mountain, Utah; Ordovician shales and limestones.
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Natural arch in Timna Valley, Negev Desert, Israel.
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Timna Valley, Negev Desert, Israel.
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Ramon Fault on the southern side of Makhtesh Ramon, Israel.
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Northern coast of Saaremaa, Estonia.
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Raised beach on the northern coast of Saaremaa, Estonia.
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Wave-cut platforms from Lake Bonneville preserved on Antelope Island, Great Salt Lake, Utah.
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U-shaped valley carved by a glacier; Little Cottonwood Creek Valley, Wasatch Mountains, Utah.
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Natural Bridge at Bryce Canyon National Park. Actually an arch.
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Carmel Formation (Middle Jurassic) near Gunlock, southwestern Utah. The dark unit at the top is the equivalent of the Cretaceous Dakota conglomerate.
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Carmel Formation (Middle Jurassic) exposed at Gunlock Reservoir, southwestern Utah.
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Late Cretaceous cold seep deposit in the Pierre Shale, southwest South Dakota.
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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.
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Disconformity with the Lower Cretaceous Edwards Formation overlying a Lower Permian limestone; hiatus is about 165 million years; Texas.
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Helminthopsis ichnosp.; a trace fossil from the Logan Formation (Lower Carboniferous) of Wooster, Ohio.
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Thalassinoides burrows produced by crustaceans; Middle Jurassic, Makhtesh Qatan, southern Israel.
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Asteriacites, a trace fossil of an ophiuroid echinoderm; Carmel Formation, near Gunlock, Utah; scale bar is 10 mm.
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Skolithos trace fossil. Scale bar is 10 mm.
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Rusophycus trace fossil from the Ordovician of southern Ohio. Scale bar is 10 mm.
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Zoophycos trace fossil from the Mississippian of northern Kentucky. Scale bar is 5.0 cm.
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Viburnum lesquereuxii leaf with insect damage; Dakota Sandstone (Cretaceous) of Ellsworth County, Kansas. Scale bar is 10 mm.
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Catellocaula vallata bioclaustration; Ordovician of Ohio.
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Cretaceous hardground from Texas with encrusting oysters and borings. The scale bar is 1.0 cm.
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Gastrochaenolites borings in a Middle Jurassic hardground, southern Utah.
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Cross-section of a carbonate hardground encrusted by oysters and bored by bivalves (Gastrochaenolites); Carmel Formation (Middle Jurassic) of southern Utah.
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Numerous borings in a Cretaceous cobble, Faringdon, England.
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Petroxestes borings in an Upper Ordovician hardground, southern Ohio.
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Trypanites borings in an Upper Ordovician hardground, southeastern Indiana.
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Sponge borings and encrusters on a modern bivalve shell, North Carolina.
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Cross-section of a Jurassic rockground; borings include Gastrochaenolites (some with boring bivalves in place) and Trypanites; Mendip Hills, England; scale bar = 1 cm.
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Trypanites borings in an Upper Ordovician hardground from northern Kentucky.
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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.
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Teredolites borings in a modern wharf piling; the work of bivalves known as "shipworms".
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Cross-section of mammoth footprints at The Mammoth Site, Hot Springs, South Dakota.
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Eubrontes, a dinosaur footprint in the Lower Jurassic Moenave Formation at the St. George Dinosaur Discovery Site at Johnson Farm, southwestern Utah.
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Gigandipus, a dinosaur footprint in the Lower Jurassic Moenave Formation at the St. George Dinosaur Discovery Site at Johnson Farm, southwestern Utah.
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Cameloid footprint (convex hyporelief) from the Barstow Formation (Miocene) of Rainbow Basin, California.
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Diplichnites, trilobite walking traces. Devonian of northeastern Ohio.
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The Ordovician cystoid Echinosphaerites aurantium from northeastern Estonia.
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Thallograptus sphaericola, a dendroid graptolite, attached to the cystoid Echinosphaerites aurantium; Ordovician of northeastern Estonia.
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A Middle Ordovician hardground from Utah with echinoderm holdfasts cemented to its upper surface.
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Cross-section of a carbonate hardground encrusted by oysters and bored by bivalves (Gastrochaenolites); Carmel Formation (Middle Jurassic) of southern Utah.
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Jurassic crinoid stems from Makhtesh Gadol in southern Israel.
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Prasopora, a trepostome bryozoan from the Ordovician of Iowa.
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Fossils in Ordovician oil shale (kukersite), northern Estonia.
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College of Wooster students collecting fossils; Ordovician of Indiana.
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Ordovician bryozoans from Indiana.
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Crinoid external molds; Logan Formation, Mississippian, Ohio.
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Aviculopecten subcardiformis from the Logan Formation, Mississippian, Ohio.
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Syringothyris sp.; a spiriferid brachiopod from the Logan Formation (Lower Carboniferous) of Wooster, Ohio (internal molds).
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Gastropod and attached mytilid bivalves on a Jurassic limestone bedding plane in southern Israel.
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Hederelloids encrusting a brachiopod from the Devonian of Ohio.
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Scanning electron microscope image of a hederelloid from the Devonian of Michigan.
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Three hederelloid species on a Devonian rugose coral.
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Ordovician fossils from Minnesota; brachiopods and bryozoans.
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A fossil receptaculitid, considered a member of the Order Dasycladales; Ordovician of Estonia.
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Brown bodies in an Ordovician bryozoan.
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Edrioasteroid (Cystaster stellatus) from the Ordovician of northern Kentucky.
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Ostreolith ("oyster ball") from the Carmel Formation (Jurassic) of southwestern Utah.
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Ostreolith ("oyster ball") interior showing an aragonitic shell cast as the nucleus and Gastrochaenolites borings; Carmel Formation (Jurassic) of southwestern Utah.
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Hyolithes cerops Walcott from the Spence Shale near Paris, Idaho (Middle Cambrian).
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Hyoliths from the Middle Ordovician of northern Estonia; these are internal molds.
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Ordovician strophomenid brachiopod encrusted with bryozoans and inarticulate brachiopods (Petrocrania).
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Petrocrania brachiopods attached to a strophomenid brachiopod; Upper Ordovician of southeastern Indiana.
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Baculites specimen in the field; western South Dakota, Late Cretaceous. Part of the phragmocone and part of the body chamber visible.
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Baculites showing sutures and remnant aragonite; western South Dakota, Late Cretaceous.
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Close-up of a conulariid from the Mississippian of Indiana.
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Conulariid from the Mississippian of Indiana.
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Ichthyosaur vertebrae from the Sundance Formation (Jurassic) of Natrona County, Wyoming.
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Nummulitid foraminiferans from the Eocene near Al Ain, United Arab Emirates. Microspheric and megalospheric specimens shown. Scale in mm.
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A broken concretion with fossils inside; Late Cretaceous near Ekalaka, Montana.
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Matthevia, a Late Cambrian polyplacophoran from the Hellnmaria Member of the Notch Peak Limestone, Steamboat Pass, southern House Range, Utah.
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Gorgonian holdfast on a Miocene limestone surface, Czech Republic.
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Crinoid columnals (Isocrinus nicoleti) from the Middle Jurassic Carmel Formation at Mount Carmel Junction, Utah. Scale in mm.
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Amplexograptus from the Ordovician near Caney Springs, Tennessee.
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Viburnum lesquereuxii leaf with insect damage; Dakota Sandstone (Cretaceous) of Ellsworth County, Kansas.
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Lepidodendron external mold from the Upper Carboniferous of Ohio.
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Stigmaria, a fossil tree root. Upper Carboniferous of northeastern Ohio.
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Fossil seed fern leaves from the Late Carboniferous of northeastern Ohio.
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Trigonia sp. from the Glen Rose Formation (Cretaceous) near Austin, Texas.
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Tentaculitids from the Devonian of Maryland. Scale bar is 5.0 mm.
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Tabulate coral (a syringoporid); Boone Limestone (Lower Carboniferous) near Hiwasse, Arkansas.
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Rudist bivalves from the Cretaceous of the Omani Mountains, United Arab Emirates.
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Platystrophia ponderosa, Maysvillian (Upper Ordovician) near Madison, Indiana.
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Phacopid trilobite from the Devonian of Ohio. Scale bar is 5.0 mm.
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Silurian Pentamerus brachiopod. Scale bar is 5.0 mm.
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Solitary rugose coral (Grewingkia) in three views; Ordovician, southeastern Indiana.
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Tullimonstrum gregarium in a concretion from the Mazon Creek (Upper Carboniferous), Illinois.
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Inoceramus from the Cretaceous of South Dakota.
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Internal mold of a nautiloid from the Upper Ordovician of northern Kentucky. Note the encruster over the mold.
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Crinoid holdfasts and bryozoans on an Upper Ordovician cobble from northern Kentucky.
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Protaraea richmondensis, a heliolitid coral; Cincinnatian (Upper Ordovician) of southeastern Indiana.
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Zygospira modesta, spiriferid brachiopods, preserved in their original positions on a trepostome bryozoan; Cincinnatian (Upper Ordovician) of southeastern Indiana.
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Root-like crinoid holdfast (Ordovician, southern Ohio).
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Hypostome of the trilobite Isotelus (Ordovician of southern Ohio).
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Rhynchotrema dentatum, a brachiopod from the Cincinnatian (Upper Ordovician) of southeastern Indiana.
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Cladocora from the Pliocene of Cyprus.
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Serpulid attached to a branch of the coral Cladocora from the Pliocene of Cyprus.
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Gastropod and attached wormtube from the Pliocene of Cyprus.
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Turritella carinata from the Pliocene of Cyprus.
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Spondylus from the Pliocene of Cyprus.
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Spondylus from the Pliocene of Cyprus.
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Diodora italica from the Pliocene of Cyprus.
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Dentalium from the Pliocene of Cyprus.
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Anadara from the Pliocene of Cyprus.
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Ammusium cristatum from the Pliocene of Cyprus.
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Belemnite from the very top of the Zohar Formation near Neve Atif, the Golan.
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Jurassic sediments in Makhtesh Gadol, Negev Desert, Israel.
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Center of Makhtesh Gadol, Negev, Israel.
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Center of Makhtesh Gadol, Negev, Israel.
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Center of Makhtesh Gadol, Negev, Israel.
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Mist flowing into Makhtesh Gadol, Negev, Israel.
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Road on northern side of Maktesh Gadol originally built by the British during oil exploration.
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Chalcolithic mine in Timna Valley, Negev Desert, Israel.
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Arch in Timna Park, Negev Desert, Israel.
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Timna Valley, Negev Desert, Israel.
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Wadi in Nahal Paran, Negev, Israel.
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Rocky exposures, Nahal Paran, Negev, Israel.
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Makhtesh Ramon, Negev Desert, Israel.
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Ramon Fault on the southern side of Makhtesh Ramon, Negev, Israel.
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Makhtesh Ramon, Negev, Israel.
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Maar lake in the Golan, Israel.
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Rainbow Cave arch in the Galilee, Israel.
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Thalassinoides trace fossils, Jurassic, Makhtesh Qatan, Israel.
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Pebbles cemented with halite on the western shore of the Dead Sea, Israel.
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Belemnite from the very top of the Zohar Formation near Neve Atif, the Golan.
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Zion Gate, Jerusalem, Israel; note bullet scars.
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Golden Gate, Jerusalem, Israel.
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Robinson's Arch, Jerusalem, Israel.
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Southern steps of the Temple Mount, Jerusalem.
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Al-Aqsa Mosque, Jerusalem, Israel.
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Washing station on the Temple Mount, Jerusalem, Israel.
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South-west qanatir, Temple Mount, Jerusalem, Israel.
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Hezekiah's Tunnel, Jerusalem, Israel.
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Mount of Olives viewed from the Old City showing the Jewish cemetery (2003).
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Mount of Olives viewed from the Old City showing the Jewish cemetery (2009).
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Kidron Valley viewed from the Old City of Jerusalem.
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Hagia Maria Sion Abbey from the Jerusalem city walls.
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Yad Kennedy, Jerusalem Forest.
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Majdal Shams, Golan Heights.
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Jacob's Ford Battlefield (1179) viewed from the Ateret Fortress main gateway to the east across the Jordan river.
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Megiddo archaeological site, Israel.
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Line painted in 1900 (at top of image) by Robert A.S. Macalister of the Palestine Exploration Fund showing the level of the Dead Sea.
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Fringing coral reef near Eilat, Israel.
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Remains of living quarters at Qumran.
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Remains of a Byzantine church at Nizana, Israel.
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Nizana, Israel, viewed from the south.
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"Way of Peace" constructed between 1996 and 2000 between Israel and Egypt.
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German-Turkish hospital (1906-1917) built on ruins of Byzantine fort at Nizana. Note battle damage.
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Shivta arachaeological site, Negev Desert, Israel.
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Acacia tree in Makhtesh Gadol.
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Acacia tree in Makhtesh Gadol.
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Avdat archaeological site, Negev, Israel.
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Avdat archaeological site, Negev, Israel.
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Egypt-Israel border, looking north from the Eilat Mountains.
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The Free Derry mural, temporarily painted pink in 2007 in honor of Gay Pride, Londonderry, Northern Ireland.
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Westland Road in the Bogside, viewed from the city wall (July 31, 2007).
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The Red Lion Pub in St. Columb Major, Cornwall, England.
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The oldest remaining Glebe house, St. Columb Major, Cornwall, England.
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St Columb Church, Cornwall, England.
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Portland's cliffs and quarries, England.
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Chesil Beach viewed from the Isle of Portland.
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Renault FT 17 tank in Bovington Tank Museum.
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The remains of a fort on Hadrian's Wall near Housesteads, England.
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Barnacles in the intertidal near Newquay, Cornwall, England.
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Mussels and barnacles in the intertidal near Newquay, Cornwall, England.
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Limpets in the intertidal near Newquay, Cornwall, England.
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Castle an Dinas as viewed from St. Columb Major, Cornwall, England.
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St. Columb Major, Cornwall, England, as viewed from Castle an Dinas.
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Statue of Euclid in the Oxford University Museum of Natural History.
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Northern coast of Saaremaa, Estonia.
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Raised beach on the northern coast of Saaremaa, Estonia.
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Shoreline at Mustvee, Estonia. July 25, 2007.
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Harbor at Mustvee, Estonia. July 25, 2007.
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Muhu Stronghold, site of the native Estonian surrender to crusaders in 1227.
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Monument in the center of the Muhu Stronghold.
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Soviet WWII graves, Saaremaa, Estonia. July 27, 2007.
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Soviet WWII memorial, Saaremaa, Estonia. July 27, 2007.
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The Bronze Soldier of Tallinn on June 26, 2006. It was at the time cordoned off by police.
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Kuressaare Castle, Saaremaa, Estonia. July 27, 2007.
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Recreation of a 16th century knight supposedly immured in a wall of Kuressaare Castle, Estonia.
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Northern coast of Muhu, Estonia. July 26, 2007.
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Katariina Church on Muhu, Estonia. July 26, 2007.
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Head of Lenin in the basement of the Museum of Occupation in Tallinn, Estonia.
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Soviet prison doors on display in the Museum of Occupations, Tallinn, Estonia.
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Monument to Juhan Smuul on Muhu Island, Estonia.
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Monument to Johan Pitka in Tallinn, Estonia.
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Marker stone on the Little Bighorn Battlefield, Montana.
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Marker stone on the Little Bighorn Battlefield, Montana.
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Greater Roadrunner at Death Valley National Park.
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Bristlecone Pine, White Mountains, California.
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Male cone of a limber pine, eastern Sierra Nevada, Rock Creek Canyon, California.
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Limber pine, eastern slope of the Sierra Nevada, Rock Creek Canyon, California.
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Juniperus occidentalis var. australis, eastern Sierra Nevada, Rock Creek Canyon, California.
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Juniperus occidentalis var. australis, eastern Sierra Nevada, Rock Creek Canyon, California.
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Juniperus occidentalis var. australis, eastern Sierra Nevada, Rock Creek Canyon, California.
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Desert Tortoise (Gopherus agassizii) in Rainbow Basin near Barstow, California.
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Desert Studies Center at Zzyzx Springs, California.
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Graves in Boothill Cemetery, Tombstone, Arizona.
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Hoodoos of rhyolite in Chiricahua National Monument, southeastern Arizona.
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Apache Pass, Arizona, as viewed from Fort Bowie facing north.
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Dragoon Mountains, Arizona, viewed from the south.
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Blue dot represents where US Army Lieutenant George N. Bascom met Apache leader Cochise on February 5, 1861, in Apache Pass, Arizona.
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Cochise Stronghold, Dragoon Mountains, southeastern Arizona.
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Sonoran Desert outside Wickenburg, Arizona.
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