eocene

Shocked gneiss (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 3
by James St. John

Borealosuchus wilsoni fossil crocodilian (Green River Formation, Lower Eocene; Fossil Lake Basin, southwestern Wyoming, USA) 1
by James St. John

Guffey Volcanic Center (Thirtynine Mile Volcanic Field, Late Eocene, ~36.1 Ma; Park County, central Colorado, USA)
by James St. John

Basalt (Lower Eocene, 50-56 Ma; Brown's Hill Quarry, near North Pole, Alaska, USA) 1
by James St. John

Bediasite (Late Eocene, 35 Ma; southeastern Texas, USA) 5
by James St. John

Emery (Naxos Emery Deposits, metamorphism in the Eocene & Miocene, 40-50 Ma & 16-20; Naxos Island, Aegean Sea) 2
by James St. John

Yellow Mounds Paleosol & Interior Paleosol (Upper Eocene; White River Badlands, South Dakota, USA) 1
by James St. John

Chert (Brian Head Formation, Middle Eocene to Lower Oligocene; Brian Head Mountain, Iron County, Utah, USA) 69
by James St. John

Garnetite (grossular garnet skarn) (Middle Eocene, 38-40 Ma; Concepcion del Oro Mining District, Zacatecas, Mexico) 1
by James St. John

Garnetite (grossular garnet skarn) (Middle Eocene, 38-40 Ma; Concepcion del Oro Mining District, Zacatecas, Mexico) 2
by James St. John

Differentially cemented & eroded sandstone (member C, Uinta Formation, Eocene; Fantasy Canyon, Utah, USA) 49
by James St. John

Megacerops sp. (fossil titanothere) (White River Formation, Eocene; Bates Hole area, Wyoming, USA)
by James St. John

Green River Formation (Middle Eocene; North Barrel Springs Draw, south of Wamsutter, Wyoming, USA)
by James St. John

Southward view towards Blanche Point from Tuketja Gully, Maslin Bay
by Dietmar Down Under

Reconstruction of Pakicetus attocki (fossil whale) (Kuldana Formation, Lower Eocene; Kala Chitta Hills, Punjab, Pakistan)
by James St. John

Priscacara liops fossil fish (Green River Formation, Lower Eocene; Fossil Lake Basin, southwestern Wyoming, USA) 1
by James St. John

Volcanic tuff (bentonite) (ash-fall tuff) (Split Fish Layer, Fossil Butte Member, Green River Formation, Lower Eocene; Promised Lands Quarry, Hams Fork Plateau, southwestern Wyoming, USA) 1
by James St. John

Guffey Volcanic Center (Thirtynine Mile Volcanic Field, Late Eocene, ~36.1 Ma; Park County, central Colorado, USA) 7
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 9
by James St. John

"Turritella Agate" (chertified fossiliferous lacustrine limestone) (Laney Member, Green River Formation, Middle Eocene; southern Wyoming, USA) 1
by James St. John

Monzonite (Bearpaw Mountains, Montana, USA) 2
by James St. John

Oil shale (kerogenite) (Parachute Creek Member, Green River Formation, Middle Eocene; near Rifle, Colorado, USA) 1
by James St. John

Fossil wood (Eocene; Fontenelle Reservoir, northeast of Kemmerer, Wyoming, USA)
by James St. John

Diplobunops matthewi fossil mammal (Uinta Formation, Upper Eocene; Uinta Basin, Utah, USA) 2
by James St. John

Morning Walk to the Buttes Chaumont (16)
by C. B. Campbell

Chert nodule (Green River Formation, Eocene; Temple Hill, east of Manti, Utah, USA) 2
by James St. John

Oil shale (kerogenite) (Parachute Creek Member, Green River Formation, Middle Eocene; near Rifle, Colorado, USA) 2
by James St. John

Knightia eocaena (fossil fish) (Green River Formation, Lower Eocene; southwestern Wyoming, USA) 1
by James St. John

Knightia eocaena (fossil fish) (Green River Formation, Lower Eocene; southwestern Wyoming, USA) 2
by James St. John

Unshocked gneiss (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 3
by James St. John

Corundite (emery rock) (Naxos Emery Deposits, metamorphism in the Eocene & Miocene, 40-50 Ma & 16-20; Naxos Island, Aegean Sea) 1
by James St. John

Buchite clinker (Wasatch Formation, Lower Eocene; coal fire metamorphism at 19 ka, Late Pleistocene; roadcut along west-bound Interstate 90's exit to Rt. 16, eastern side of Buffalo, Powder River Basin, northern Wyoming, USA) 4
by James St. John

Unshocked gneiss (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 4
by James St. John

Shattercone (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 1
by James St. John

Unshocked gneiss (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 1
by James St. John

Unshocked gneiss (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 2
by James St. John

Lacustrine stromatolite (Green River Formation, Eocene; White Hill, near Ephraim, Utah, USA) 3
by James St. John

Fossil Fish Plate - Mioplosus
by lsankey2

Fossil Butte National Monument
by RuggyBearLA

Callospermophilus lateralis (golden-mantled ground squirrel) (Devils Postpile National Monument, California, USA)
by James St. John

Borealosuchus wilsoni fossil crocodilian (Green River Formation, Lower Eocene; Fossil Lake Basin, southwestern Wyoming, USA) 2
by James St. John

Buchite clinker (Wasatch Formation, Lower Eocene; coal fire metamorphism at 19 ka, Late Pleistocene; roadcut along west-bound Interstate 90's exit to Rt. 16, eastern side of Buffalo, Powder River Basin, northern Wyoming, USA) 1
by James St. John

Differentially cemented & eroded sandstone (member C, Uinta Formation, Eocene; Fantasy Canyon, Utah, USA) 5
by James St. John

Fantasy Canyon
by RuggyBearLA

Priscacara liops fossil fish (Green River Formation, Lower Eocene; Fossil Lake Basin, southwestern Wyoming, USA) 2
by James St. John

Bediasite (Late Eocene, 35 Ma; southeastern Texas, USA) 3
by James St. John

Garnet Hill Rhyolite (Late Eocene, 36-37 Ma; Garnet Hill, White Pine County, Nevada, USA)
by James St. John

Knightia eocaena (fossil fish) (Green River Formation, Lower Eocene; southwestern Wyoming, USA) 3
by James St. John

Bediasite (Late Eocene, 35 Ma; southeastern Texas, USA) 6
by James St. John

Eupatagus mooreanus (fossil heart urchin) (Eocene; Florida, USA) 2
by James St. John

Impact breccia (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 2
by James St. John

Buchite clinker (Wasatch Formation, Lower Eocene; coal fire metamorphism at 19 ka, Late Pleistocene; roadcut along west-bound Interstate 90's exit to Rt. 16, eastern side of Buffalo, Powder River Basin, northern Wyoming, USA) 3
by James St. John

Buchite clinker (Wasatch Formation, Lower Eocene; coal fire metamorphism at 19 ka, Late Pleistocene; roadcut along west-bound Interstate 90's exit to Rt. 16, eastern side of Buffalo, Powder River Basin, northern Wyoming, USA) 5
by James St. John

Clinker outcrop (Wasatch Formation, Lower Eocene; coal fire metamorphism at 19 ka, Late Pleistocene; Interstate 90 west-bound hilltop rest area, east of Buffalo, Powder River Basin, Wyoming, USA) 1
by James St. John

Garnet in rhyolite (Garnet Hill Rhyolite, Late Eocene, 36-37 Ma; Garnet Hill, White Pine County, Nevada, USA)
by James St. John

Cynomys ludovicianus (black-tailed prairie dog) (Little Missouri Badlands, North Dakota, USA) 12
by James St. John

Priscacara serrata fossil fish (Green River Formation, Lower Eocene; Fossil Lake Basin, southwestern Wyoming, USA) 1
by James St. John

Buchite clinker (Wasatch Formation, Lower Eocene; coal fire metamorphism at 19 ka, Late Pleistocene; roadcut along west-bound Interstate 90's exit to Rt. 16, eastern side of Buffalo, Powder River Basin, northern Wyoming, USA) 2
by James St. John

Impact breccia (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 1
by James St. John

Cynomys ludovicianus (black-tailed prairie dog) (Little Missouri Badlands, North Dakota, USA) 5
by James St. John