clasts

Gravel dredging machine (St. Louisville gravel pits, Licking County, Ohio, USA) 5
by James St. John

Oolitic ironstone (Brassfield Formation, Lower Silurian; Ohio Brush Creek roadcut, southern Ohio, USA) 3
by James St. John

Pseudotachylitic fault breccia (Homestake Shear Zone, Mesoproterozoic, 1375-1386 Ma) in gneiss (Paleoproterozoic, 1630-1710 Ma; Homestake Creek Valley, Sawatch Range, Colorado, USA) 8
by James St. John

Banded dacite pumice-andesite (upper Holocene, 22 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 2
by James St. John

Hexagonaria sp. (fossil coral) (Devonian; Lake Michigan shoreline, near Bay View, Michigan, USA) 3
by James St. John

Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 27
by James St. John

Marinace Green Granite (polymict metaconglomerate) (Ouricuri do Ouro Formation, Mesoproterozoic, ~1.6-1.7 Ga; Bahia, Brazil) 15
by James St. John

Glacial outwash (Upper Pleistocene, 15-18 ka; St. Louisville gravel pits, Licking County, Ohio, USA) 32
by James St. John

DSC_0240
by tracie7779

Glacial outwash (Upper Pleistocene, 15-18 ka; St. Louisville gravel pits, Licking County, Ohio, USA) 63
by James St. John

Sorted gravel from Pleistocene glacial outwash (St. Louisville gravel pits, Licking County, Ohio, USA) 5
by James St. John

Agate (shoreline of Lake Superior, Upper Peninsula of Michigan, USA) 6
by James St. John

Pink Grotto - boulder rubble in calcarenitic limestone (San Salvador Island, Bahamas) 2
by James St. John

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

Glacial outwash (Upper Pleistocene, 15-18 ka; St. Louisville gravel pits, Licking County, Ohio, USA) 6
by James St. John

Homotrema rubrum (encrusting foraminifera) (modern; San Salvador Island, Bahamas) 1
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) 10
by James St. John

Ironstone in quartz-pebble conglomerate (Sharon Conglomerate, Lower Pennsylvanian; Jackson North roadcut, Ohio, USA) 3
by James St. John

Eurypterids (fossil sea scorpions) (probably Silurian; South Bass Island, Lake Erie, Ohio, USA) 2
by James St. John

Kimberlite (Snegurochka Pipe, Late Devonian; Arkhangelsk Region, Russia) 3
by James St. John

Mount Scott Volcano (Crater Lake National Park, Oregon, USA) 15
by James St. John

Ironstone pebbles in quartz-pebble conglomerate (Sharon Conglomerate, Lower Pennsylvanian; Jackson North roadcut, Ohio, USA) 1
by James St. John

Glacial outwash (Upper Pleistocene, 15-18 ka; St. Louisville gravel pits, Licking County, Ohio, USA) 25
by James St. John

Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 11
by James St. John

Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 4
by James St. John

Silicified limestone clast in quartz-pebble conglomerate ("Sharon Conglomerate", Lower Pennsylvanian; Jackson North roadcut, Ohio, USA) 3
by James St. John

Black mudshale with glacial scratches 2
by James St. John

Clast-rich impact pseudotachylite (Sudbury Breccia, Paleoproterozoic, 1.85 Ga; Windy Lake Northwest roadcut, Sudbury Impact Structure, Ontario, Canada) 96
by James St. John

Dolostone breccia with brown fluorite (Lockport Dolomite, Middle Silurian; quarry in Ottawa County, Ohio, USA) 2
by James St. John

Eolianite limestone clast breccia filling a dissolution pit (Sandy Point Northeast roadcut, San Salvador Island, Bahamas) 1
by James St. John

Nephrite jade (Precambrian; Wyoming, USA) 2
by James St. John

Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 2
by James St. John

Brecciated flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 7
by James St. John

Rhyolites (Nez Perce Creek Flow, Middle Pleistocene, ~152 ka; Firehole Falls, Yellowstone, Wyoming, USA)
by James St. John

Hexagonaria percarinata (fossil coral) (Petoskey Stone) (Traverse Group, Middle Devonian; Michigan, USA) 8
by James St. John

Quenched blobs in pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 5
by James St. John

Glacial outwash (Pleistocene; St. Louisville gravel pits, Licking County, Ohio, USA) 21
by James St. John

Clast-rich impact pseudotachylite (Sudbury Breccia, Paleoproterozoic, 1.85 Ga; Windy Lake Northwest roadcut, Sudbury Impact Structure, Ontario, Canada) 90
by James St. John

Volcanic debris flow deposit (upper Holocene, May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 48
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) 8
by James St. John

Sandstone (Sharon Formation, Lower Pennsylvanian; Virginia Kendall Ledges, Ohio, USA) 6
by James St. John

Volcanic breccia (Upper Oligocene, 25 Ma; Narbona Pass Maar Volcano, near the summit of the Chuska Mountains, Navajo Volcanic Field, New Mexico, USA) 9
by James St. John

Clast-rich mixtite (Coleman Member, Gowganda Formation, Paleoproterozoic, ~2.3 Ga; Percival Lake roadcut, Ontario, Canada) 26
by James St. John

Imbricated limestone slabs (gravel bar along Flat Fork, Warren County, Ohio, USA) 1
by James St. John

Pseudotachylitic fault breccia (Homestake Shear Zone, Mesoproterozoic, 1375-1386 Ma) in gneiss (Paleoproterozoic, 1630-1710 Ma; Homestake Creek Valley, Sawatch Range, Colorado, USA) 2
by James St. John

Conglomerate (Amargosa Valley Formation, Tertiary; Funeral Mountains, California, USA) 4
by James St. John

Narrows Basalt (Lower Pleistocene, 1.5-1.6 Ma) (Narrows of the Yellowstone River, northeastern Yellowstone National Park, Wyoming, USA) 5
by James St. John

Black porphyritic dacite (upper Holocene, 14 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 43
by James St. John

Pseudotachylitic fault breccia (Homestake Shear Zone, Mesoproterozoic, 1375-1386 Ma) in gneiss (Paleoproterozoic, 1630-1710 Ma; Homestake Creek Valley, Sawatch Range, Colorado, USA) 5
by James St. John

Clast-poor mixtite (Coleman Member, Gowganda Formation, Paleoproterozoic, ~2.3 Ga; Percival Lake roadcut, Ontario, Canada) 9
by James St. John

Quenched blobs in pinkish-reddish porphyritic dacite (Upper Pleistocene, 27 ka; Devastated Area, Lassen Volcano National Park, California, USA) 10
by James St. John

Glacial outwash (Pleistocene; St. Louisville gravel pits, Licking County, Ohio, USA) 17
by James St. John

Glacial outwash (Upper Pleistocene, 15-18 ka; St. Louisville gravel pits, Licking County, Ohio, USA) 49
by James St. John

Dan Leavell & glacial outwash (Pleistocene; St. Louisville gravel pits, Licking County, Ohio, USA) 1
by James St. John

Jasper-quartz pebble conglomerate (Lorrain Formation, Paleoproterozoic, ~2.3 Ga) 2
by James St. John

Glacial till (Upper Pleistocene; VanWinkle Unit # 1 wellsite, Granville, Ohio, USA) 2
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) 29
by James St. John

Sorted gravel from Pleistocene glacial outwash (St. Louisville gravel pits, Licking County, Ohio, USA) 15
by James St. John

Flint-knapped spearpoint (Flint River Chert, Oligocene; near Albany, Georgia, USA) 2
by James St. John

Sorted gravel piles from Pleistocene glacial outwash (St. Louisville gravel pits, Licking County, Ohio, USA) 9
by James St. John