clasts

Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 56
by James St. John

Odessa Breccia (Upper Pleistocene, 64 ka; Odessa Impact Crater, Texas, USA) 7
by James St. John

Metatillite (diamictite) (Gowganda Formation, Paleoproterozoic, ~2.3 Ga; Route 6 outcrop, north of Manitoulin Island, Ontario, Canada) 2
by James St. John

Glacial striations
by James St. John

Polymict conglomerate (Ogishkemuncie Conglomerate, Neoarchean; Ogishkemuncie Lake, Boundary Waters, Minnesota, USA) 8
by James St. John

DSC_0244
by tracie7779

Pottsville Group over Maxville Limestone (Pleasant Valley Limestone Quarry, Muskingum County, Ohio, USA) 5
by James St. John

Basaltic lapillistone (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.719 Ga; just east of the Potter Mine, east of Timmins, Ontario, Canada) 15
by James St. John

Clinker chimney (Sentinel Butte Formation, Upper Paleocene; Coal Vein Trail, Roosevelt National Park, Little Missouri Badlands, North Dakota, USA) 1
by James St. John

Clast-rich mixtite (Coleman Member, Gowganda Formation, Paleoproterozoic, ~2.3 Ga; Percival Lake roadcut, Ontario, Canada) 17
by James St. John

Agate (shoreline of Lake Superior, Upper Peninsula of Michigan, USA) 8
by James St. John

Fluvial gravel bar (Salt Creek, Haynes, Hocking County, Ohio, USA) 1
by James St. John

Calcareous tufa with plant fragments (Holocene; spring emerging from glacial till, above Lobdell Creek, near Alexandria, western Licking County, central Ohio, USA) 3
by James St. John

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

Nephrite jade ventifact (Precambrian; Granite Mountains, Wyoming, USA) 8
by James St. John

Lahar (Thirtynine Mile Volcanics, Upper Eocene; 34-36 Ma; Evergreen Station South roadcut, Colorado, USA) 75
by James St. John

Pedogenic breccia (Conemaugh Group, Upper Pennsylvanian; creek cut on the western side of Caldwell, Ohio, USA) 18
by James St. John

Autobrecciated amygdaloidal quartz tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 33
by James St. John

Fossiliferous asphaltic limestone (Buckhorn Asphalt, Middle Pennsylvanian; Buckhorn Asphalt Quarry, Oklahoma, USA) 4
by James St. John

Glauconitic flat-pebble conglomerate (Gros Ventre Formation, Cambrian; Bighorn Mountains, Wyoming, USA) 7
by James St. John

Garnetiferous blueschist (Ward Creek, Sonoma County, California, USA) 2
by James St. John

Grindstone from an end-Pleistocene large pothole (Interstate State Park, Taylors Falls, Minnesota, USA) 5
by James St. John

Clast-rich impact pseudotachylite (Sudbury Breccia, Paleoproterozoic, 1.85 Ga; Windy Lake Northwest roadcut, Sudbury Impact Structure, Ontario, Canada) 3
by James St. John

Clast-rich mixtite (Coleman Member, Gowganda Formation, Paleoproterozoic, ~2.3 Ga; Percival Lake roadcut, Ontario, Canada) 10
by James St. John

Paleosol (Cave Branch Member, Slade Formation, Upper Mississippian; Clack Mountain Road Outcrop, south of Morehead, Kentucky, USA) 25
by James St. John

Auriga Nunataks calc-sil clast in marble melange 2
by euphro

Pedogenic breccia (Conemaugh Group, Upper Pennsylvanian; creek cut on the western side of Caldwell, Ohio, USA) 16
by James St. John

Polymict conglomerate (Ogishkemuncie Conglomerate, Neoarchean; Ogishkemuncie Lake, Boundary Waters, Minnesota, USA) 1
by James St. John

Pedogenic breccia (Conemaugh Group, Upper Pennsylvanian; creek cut on the western side of Caldwell, Ohio, USA) 1
by James St. John

Spokane Sapphire Mine (near Helena, Montana, USA) 12
by James St. John

Jonathan Run (north-northwest of Fultonham, Ohio, USA) 15
by James St. John

Quartz lining flint breccia-floored cavity in flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 6
by James St. John

Diamictite (metatillite) (Konnarock Formation, Neoproterozoic, ~750 Ma; Rt. 603 roadcut near Konnarock, Virginia, USA) 84
by James St. John

Copper skull (Mesoproterozoic, 1.05-1.06 Ga; Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 6
by James St. John

Metatillite (Diamictite) (Gowganda Formation, 2.3 Ga; Salt Creek gravel bar, Haynes, Ohio, USA) 2
by James St. John

Intergranular calcite in autobrecciated amygdaloidal tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 6
by James St. John

Jonathan Run (north-northwest of Fultonham, Ohio, USA) 8
by James St. John

Autobrecciated amygdaloidal quartz tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 20
by James St. John

Impact breccia with melt (possibly a suevite) (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 5
by James St. John

Sudbury Breccia intruding Cartier Granite (Precambrian; Crab Lake South roadcut, south-southeast of Cartier, Ontario, Canada) 33
by James St. John

Tholeiitic basalt dike with flow layering & peperite & basaltic lapillistone (Middle Tholeiitic Unit, Kidd-Munro Assemblage, Neoarchean, 2.711-2.719 Ga; just east of the Potter Mine, east of Timmins, Ontario, Canada) 4
by James St. John

Clinker breccia (Sentinel Butte Formation, Upper Paleocene; Coal Vein Trail, Roosevelt National Park, Little Missouri Badlands, North Dakota, USA) 3
by James St. John

Imbricated gravel (Salt Creek gravel bar, Haynes, Hocking County, Ohio, USA) 4
by James St. John

Pedogenic breccia (Conemaugh Group, Upper Pennsylvanian; creek cut on the western side of Caldwell, Ohio, USA) 21
by James St. John

Polymict conglomerate (Ogishkemuncie Conglomerate, Neoarchean; Ogishkemuncie Lake, Boundary Waters, Minnesota, USA) 4
by James St. John

Impact breccia with melt (possibly a suevite) (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 4
by James St. John

Clast-rich mixtite (Coleman Member, Gowganda Formation, Paleoproterozoic, ~2.3 Ga; Percival Lake roadcut, Ontario, Canada) 20
by James St. John

Hexagonaria sp. (fossil coral) (Devonian; Lake Michigan shoreline, near Bay View, Michigan, USA) 4
by James St. John

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

Polymict conglomerate (Ogishkemuncie Conglomerate, Neoarchean; Ogishkemuncie Lake, Boundary Waters, Minnesota, USA) 5
by James St. John

Glacially scratched & faceted limestone pebble from Pleistocene glacial till (Granville, Ohio, USA) 3
by James St. John

Autobrecciated amygdaloidal quartz tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 10
by James St. John

Chertified fossiliferous limestone (St. Louisville Gravel Pit, Licking County, Ohio, USA)
by James St. John

Autobrecciated amygdaloidal quartz tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 12
by James St. John

Dripping Rock Cave - boulder rubble in oolitic calcarenitic limestone (San Salvador Island, Bahamas) 2
by James St. John

Dinosaur gastrolith (likely from the Morrison Formation, Upper Jurassic; western USA) 3
by James St. John

BIF clast in pebbly, coarse-grained sandstone (Licking County gravel bar, Newark, Ohio, USA)
by James St. John

Leptaena fossil brachiopod in fossiliferous limestone (Middle Devonian; gravel bar clast, Olentangy River, Columbus, Ohio, USA) 1
by James St. John

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

Autobrecciated amygdaloidal quartz tholeiite basalt aa lava flow top (flow B, Two Harbors Basalts, North Shore Volcanic Series, Mesoproterozoic, 1097-1098 Ma; Burlington Bay, Two Harbors, Minnesota, USA) 18
by James St. John