quartzose

Ancestral Shoshone Indian petroglyphs (~1000 to ~200 years old) (White Mountain Petroglyphs, southwestern Wyoming, USA) 5
by James St. John

Quartz-pebble conglomerate 3
by James St. John

Quartzose sandstone (Blakely Sandstone, Middle Ordovician; Coleman Quartz Mine, Arkansas, USA) 5
by James St. John

Skolithos trace fossils in quartzose sandstone (Mazomanie Formation, Upper Cambrian; riverside cliff, western side of the St. Croix River, northeast of Lookout Point, Minnesota, USA) 9
by James St. John

Sauropod dinosaur tracks in sandstone (Morrison Formation, Upper Jurassic; western side of Dinosaur Ridge, Colorado, USA) 5
by James St. John

Jaspilite banded iron formation (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; Stuntz Bay Road outcrop, Soudan Underground State Park, Soudan, Minnesota, USA) 23
by James St. John

Skolithos linearis burrows in sandstone (Clinch Formation, Lower Silurian; Clinch Mountain, Tennessee, USA) 9
by James St. John

Fossiliferous sandstone (Byer Sandstone, Lower Mississippian; gravel bar clast, Chatham, Ohio, USA) 2
by James St. John

Aztec Sandstone (Upper Triassic to Lower Jurassic; Valley of Fire, Nevada, USA) 5
by James St. John

Sauropod dinosaur track in sandstone (Morrison Formation, Upper Jurassic; western side of Dinosaur Ridge, Colorado, USA) 1
by James St. John

Soft-sediment deformation in quartzose sandstone (Navajo Sandstone, Lower Jurassic; Capitol Reef National Park, Utah, USA) 7
by James St. John

Skolithos linearis burrows in sandstone (Clinch Formation, Lower Silurian; Clinch Mountain, Tennessee, USA) 4
by James St. John

Black Hand Sandstone (Lower Mississippian; Rock House, Hocking Hills, Ohio, USA) 13
by James St. John

Dickinsonia costata (Ediacaran fossil) (Ediacara Member, Rawnsley Quartzite, near-uppermost Neoproterozoic; Flinders Ranges, South Australia) 2
by James St. John

De Chelly Sandstone (Lower Permian; Canyon de Chelly, Arizona, USA) 85
by James St. John

Sandstone (Sharon Formation, Lower Pennsylvanian; Virginia Kendall Ledges, Ohio, USA) 3
by James St. John

Manganese oxide-coated chert in limestone (Lost River Chert Bed, Middle Mississippian; Martel Avenue, Mammoth Cave, Kentucky, USA) 6
by James St. John

Flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 18
by James St. John

Flint arrowhead (farmer's field near Glenford, Ohio, USA) 35
by James St. John

Quartzose sandstone (lower Pottsville Group, Pennsylvanian; northwestern Pennsylvania, USA) 19
by James St. John

Black Hand Sandstone (Lower Mississippian; Rock House, Hocking Hills, Ohio, USA) 10
by James St. John

Flint breccia-floored cavity in pinstriple flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 1
by James St. John

Symmetrical ripple marks (Berea Sandstone, Upper Devonian-Lower Mississippian; Blendon Woods Park, Columbus, Ohio, USA) 2
by James St. John

President Bridge (Natural Bridges National Monument, Utah, USA) 2
by James St. John

Dry tributary under Congressman Bridge (Natural Bridges National Monument, Utah, USA) 2
by James St. John

Wingate Sandstone (Lower Jurassic; Coke Ovens, Monument Canyon, Colorado National Monument, Colorado, USA) 2
by James St. John

Soft-sediment deformation in quartzose sandstone (Navajo Sandstone, Lower Jurassic; Capitol Reef National Park, Utah, USA) 8
by James St. John

Sauropod dinosaur track in sandstone (Morrison Formation, Upper Jurassic; western side of Dinosaur Ridge, Colorado, USA) 2
by James St. John

Jaspilite banded iron formation (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; Stuntz Bay Road outcrop, Soudan Underground State Park, Soudan, Minnesota, USA) 38
by James St. John

Jaspilite banded iron formation (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; Stuntz Bay Road outcrop, Soudan Underground State Park, Soudan, Minnesota, USA) 42
by James St. John

Sandstone & conglomerate ("Sharon" Conglomerate, Lower Pennsylvanian; Jackson North roadcut, Ohio, USA) 2
by James St. John

Quartzose sandstone (Black Hand Sandstone, Lower Mississippian; railroad cut west of Black Hand Gorge, Ohio, USA) 3
by James St. John

Gold ore (auriferous altered rhyolite) (Golden Wonder Vein, Late Oligocene, 27.5 Ma; Golden Wonder Mine, San Juan Mountains, Colorado, USA) 6
by James St. John

Conglomerate & sandstone (Sharon Formation, Lower Pennsylvanian; Virginia Kendall Ledges, Ohio, USA) 2
by James St. John

Differentially cemented & eroded sandstone (member C, Uinta Formation, Eocene; Fantasy Canyon, Utah, USA) 13
by James St. John

Differentially cemented & eroded sandstone (member C, Uinta Formation, Eocene; Fantasy Canyon, Utah, USA) 17
by James St. John

Buffalo River Flint (attributed to the Ft. Payne Formation, Lower Mississippian; Tennessee, USA) 1
by James St. John

Pine Tree Arch (Arches National Park, eastern Utah, USA)
by James St. John

Mudlogging trailer at VanWinkle Unit # 1 petroleum well (west of Granville, Ohio, USA)
by James St. John

Skolithos trace fossils in quartzose sandstone (Mazomanie Formation, Upper Cambrian; riverside cliff, western side of the St. Croix River, northeast of Lookout Point, Minnesota, USA) 5
by James St. John

Sandstone-coal-tonsteins (Ericson Sandstone over Rock Springs Formation, Upper Cretaceous; hairpin curve roadcut along Superior Cutoff Road, east of Superior, Wyoming, USA) 1
by James St. John

Horse Creek Flint (attributed to the Ft. Payne Formation, Lower Mississippian; near Savannah, Tennessee, USA) 1
by James St. John

Byer Sandstone (Lower Mississippian; State Farm Quarry, Newark, Ohio, USA) 9
by James St. John

Flint artifacts (Coshocton Flint, Pennsylvanian; Ohio, USA) 2
by James St. John

Differentially cemented & eroded sandstone (member C, Uinta Formation, Eocene; Fantasy Canyon, Utah, USA) 23
by James St. John

Sauropod dinosaur footprint in sandstone (Morrison Formation, Upper Jurassic, western side of Dinosaur Ridge, Colorado, USA) 49
by James St. John

Jaspilite banded iron formation (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; Stuntz Bay Road outcrop, Soudan Underground State Park, Soudan, Minnesota, USA) 56
by James St. John

Skolithos linearis burrows in sandstone (Clinch Formation, Lower Silurian; Clinch Mountain, Tennessee, USA) 1
by James St. John

Sandstone-coal-tonsteins (Ericson Sandstone over Rock Springs Formation, Upper Cretaceous; hairpin curve roadcut along Superior Cutoff Road, east of Superior, Wyoming, USA) 3
by James St. John

Sandstone (Cambrian; Ablemans, Sauk County, Wisconsin, USA)
by James St. John

Quartzose sandstone (Black Hand Sandstone, Lower Mississippian; railroad cut west of Black Hand Gorge, Ohio, USA) 6
by James St. John

Indian petroglyphs (~100 B.C. to ~1540 A.D.) (Newspaper Rock, southeastern Utah, USA) 1
by James St. John

Flint with quartz-lined cavity (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 3
by James St. John

Differentially cemented & eroded sandstone (member C, Uinta Formation, Eocene; Fantasy Canyon, Utah, USA) 21
by James St. John

Fossil wood impression (Dakota Sandstone, Lower Cretaceous; Dinosaur Ridge, Colorado, USA) 11
by James St. John

Overturned crossbeds in sandstone (Sharon Formation, Lower Pennsylvanian; Virginia Kendall Ledges, Ohio, USA) 4
by James St. John

Quartz crystal-lined vug with barite in flint meganodule (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, eastern Flint Ridge, Ohio, USA) 1
by James St. John

Opuntia sp. (prickly pear cactus) (north of Bootlegger Canyon, Utah, USA) 18
by James St. John

Sauropod dinosaur footprint in lacustrine sandstone (Morrison Formation, Upper Jurassic, western side of Dinosaur Ridge, Colorado, USA) 13
by James St. John

De Chelly Sandstone (Lower Permian; Canyon de Chelly, Arizona, USA) 41
by James St. John