siliciclastics

Clinker-bed breccia (Wasatch Formation, Lower Eocene; coal fire metamorphism at 19 ka, Late Pleistocene; large block at Interstate 90 west-bound hilltop rest area, east of Buffalo, Powder River Basin, Wyoming, USA) 4
by James St. John

Sediment-filled mudcracks (Kayenta Formation, Lower Jurassic; north of Bootlegger Canyon, west of Moab, Utah, USA) 5
by James St. John

Rock salt (halitite) 2
by James St. John

End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 6
by James St. John

Pisolitic bauxite (Arkansas, USA) 3
by James St. John

Banded jasper (hematitic chert) (fluvial pebble; Honduras)
by James St. John

Trace fossils (Vinton Member, Logan Formation, Lower Mississippian; Hanover Pit, Licking County, Ohio, USA) 3
by James St. John

Turgite on sandstone (Vinton Member, Logan Formation, Lower Mississippian; Hanover Pit, Licking County, Ohio, USA) 1
by James St. John

Congressman Bridge (Natural Bridges National Monument, Utah, USA) 3
by James St. John

Glacial copper (Portage Lake Volcanic Series, late Mesoproterozoic, 1.05 to 1.06 Ga; Upper Peninsula of Michigan, USA) 1
by James St. John

Sphalerite replacing Bonneterre Dolostone (Magmont Mine, New Lead Belt, Bixby, Missouri, USA) 2
by James St. John

Poorly indurated clayey sandstones with Ophiomorpha burrows (Citronelle Formation, Pliocene; Bay Bluffs Park, Pensacola, Florida, USA) 2
by James St. John

Tapeats Sandstone (Cambrian; Grand Canyon, Arizona, USA) 2
by James St. John

Amygdaloidal basalt (upper Portage Lake Volcanic Series, upper Mesoproterozoic, ~1.094 Ga; Delaware Copper Mine, Upper Peninsula of Michigan, USA)
by James St. John

Fossiliferous chert nodule with fossil sponge (Upper Cretaceous; Warminster, England) 1
by James St. John

End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 14
by James St. John

Iron oxide stained & banded, cross-bedded quartzose sandstone (Hyden Formation, Middle Pennsylvanian; Jackson North roadcut, Breathitt County, Kentucky, USA) 1
by James St. John

Clinker-bed breccia (Wasatch Formation, Lower Eocene; coal fire metamorphism at 19 ka, Late Pleistocene; large block at Interstate 90 west-bound hilltop rest area, east of Buffalo, Powder River Basin, Wyoming, USA) 9
by James St. John

Vertically-oriented beds of the Laramie Formation (Upper Cretaceous; Parfet Prehistoric Preserve, Golden, Colorado, USA) 78
by James St. John

Sandstones (Sentinel Butte Formation, Upper Paleocene; Buck Hill, Little Missouri Badlands, North Dakota, USA) 6
by James St. John

Marine shoreline of Cayo Costa Island (Pine Island Sound, Florida, USA) 2
by James St. John

Fossiliferous chert nodule with fossil sponge (Upper Cretaceous; Warminster, England) 2
by James St. John

Fossiliferous sandstone (Byer Sandstone Member, Logan Formation, Lower Mississippian; east-central Ohio, USA) 1
by James St. John

Shinarump Conglomerate over De Chelly Sandstone (Upper Triassic over Lower Permian; Canyon de Chelly, Arizona, USA) 3
by James St. John

Mollusc shells on marine beach (Sanibel Inn Beach, Sanibel Island, Florida, USA) 7
by James St. John

Cupriferous amygdaloidal basalt (Kearsarge Flow, Portage Lake Volcanic Series, upper Mesoproterozoic, 1.095 Ga; South Kearsarge Mine, Upper Peninsula of Michigan, USA) 1
by James St. John

Entrada Sandstone (Middle Jurassic; Goblin Valley, Utah, USA) 72
by James St. John

Coquina (Quaternary; Cayo Costa Island, Florida, USA) 4
by James St. John

Polymict conglomerate (Ogishkemuncie Conglomerate, Neoarchean; Ogishkemuncie Lake, Boundary Waters, Minnesota, USA) 2
by James St. John

Congressman Bridge (Natural Bridges National Monument, Utah, USA) 5
by James St. John

Cupriferous amygdaloidal basalt (Kearsarge Flow, Portage Lake Volcanic Series, upper Mesoproterozoic, 1.095 Ga; South Kearsarge Mine, Upper Peninsula of Michigan, USA) 2
by James St. John

Ophiomorpha burrows in poorly indurated clayey sandstone (Citronelle Formation, Pliocene; Bay Bluffs Park, Pensacola, Florida, USA) 8
by James St. John

Allouez Conglomerate (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.094 Ga; Delaware Copper Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 2
by James St. John

Allouez Conglomerate (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.094 Ga; Delaware Copper Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 1
by James St. John

End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 3
by James St. John

Lateral breach in an end-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 1
by James St. John

Quartzose sandstones (Mazomanie Formation, Upper Cambrian; riverside cliff, western side of the St. Croix River, northeast of Lookout Point, Minnesota, USA) 3
by James St. John

Clinker-bed breccia (Wasatch Formation, Lower Eocene; coal fire metamorphism at 19 ka, Late Pleistocene; large block at Interstate 90 west-bound hilltop rest area, east of Buffalo, Powder River Basin, Wyoming, USA) 3
by James St. John

Garnet schist (Late Cretaceous, 89-90 Ma; Garnet Ledge, about 12 km north of Wrangell, southeastern Alaska, USA) 9
by James St. John

Iron oxide-stained, poorly indurated clayey sandstone with Ophiomorpha burrow (Citronelle Formation, Pliocene; Bay Bluffs Park, Pensacola, Florida, USA)
by James St. John

Metaconglomerate ("Marinace Red Granite") (Precambrian; Brazil)
by James St. John

Pottsville Group over Maxville Limestone (Black 17 Mine, White Cottage, Ohio, USA) 10
by James St. John

Amygdaloidal basalt (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.093 to 1.097 Ga; Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 13
by James St. John

Ophiomorpha burrow in poorly indurated clayey sandstone (Citronelle Formation, Pliocene; Bay Bluffs Park, Pensacola, Florida, USA) 2
by James St. John

End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Bake Oven Pothole, Interstate State Park, Taylors Falls, Minnesota, USA) 4
by James St. John

Chugwater Formation (Upper Triassic; Red Hill, Seminoe Mountains, Wyoming, USA) 1
by James St. John

Mollusc shells on marine beach (Sanibel Inn Beach, Sanibel Island, Florida, USA) 8
by James St. John

Oolitic limestone (Salem Limestone, Middle Mississippian; Bedford, Indiana, USA) 2
by James St. John

Eubrontes giganteus (dinosaur footprint) (Longmeadown Formation, Upper Triassic to Lower Jurassic; Mt. Tom Dinosaur Tracksite, Connecticut River Valley, Massachusetts, USA)
by James St. John

Non-vesicular basalt flow over rubbly-topped vesicular basalt flow (Portage Lake Volcanic Series, upper Mesoproterozoic, 1.094 to 1.095 Ga; Rt. 41 roadcut west of the Delaware Mine, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 6
by James St. John

Diplodocus carnegii sauropod dinosaur (Morrison Formation, Upper Jurassic; Sheep Creek, Albany County, southeastern Wyoming, USA) 1
by James St. John

End-Pleistocene pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 3
by James St. John

Plant fossils (Cow Branch Formation, Upper Triassic; Pit B of Solite Quarry, near Eden, North Carolina, USA) 2
by James St. John

Clinker (Wasatch Formation, Lower Eocene; coal fire metamorphism at 19 ka, Late Pleistocene; large block at Interstate 90 west-bound hilltop rest area, east of Buffalo, Powder River Basin, Wyoming, USA) 3
by James St. John

End-Pleistocene large pothole in tholeiitic basalt (Clam Falls Volcanics, Mesoproterozoic, ~1.1 Ga; Interstate State Park, Taylors Falls, Minnesota, USA) 7
by James St. John

Clinker horizon (Wasatch Formation, Lower Eocene; coal fire metamorphism at 19 ka, Late Pleistocene; hills east of Buffalo, Powder River Basin, Wyoming, USA)
by James St. John

Bituminous coal (Pennsylvanian; eastern or midwestern USA)
by James St. John

Fossiliferous sandstone with mudchips (Vinton Member, Logan Formation, Lower Mississippian; Hanover Pit, Licking County, Ohio, USA) 3
by James St. John

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

Dry tributary under Congressman Bridge (Natural Bridges National Monument, Utah, USA) 1
by James St. John