disconformity

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 2
by James St. John

Portwood Member of the New Albany Shale over the Boyle Formation (Middle Devonian; Drowning Creek East outcrop, Estill County, Kentucky, USA) 3
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 5
by James St. John

Fossil colonial coral (Marblehead Member, Columbus Limestone, Middle Devonian; lakehore outcrop near Marblehead Lighthouse, Ottawa County, Ohio, USA) 13
by James St. John

Manitou Limetone over Peerless Formation (Manitou Avenue roadcut, Manitou Springs, Colorado, USA) 1
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 6
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 2
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 9
by James St. John

Chert (Delaware Limestone, Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA)
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 4
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 7
by James St. John

Shinarump Conglomerate over De Chelly Sandstone (Upper Triassic over Lower Permian; Canyon de Chelly, Arizona, USA) 10
by James St. John

Strophomenid brachiopod in fossiliferous limestone (Columbus Limestone, Middle Devonian; southern shore of Kelleys Island, Lake Erie, Ohio, USA)
by James St. John

Quaternary gravel over Jurassic red shale (Salina Canyon, Utah, USA) 7
by James St. John

Limestones (Slade Formation, Upper Mississippian; Rt. 1274-Rt. 801 outcrop, southwest of Morehead, Kentucky, USA) 1
by James St. John

Columbus Limestone (Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 13
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 5
by James St. John

Rippled sandstone (Rawnsley Quartzite, Ediacaran; Three Sisters Range, South Australia) 1
by James St. John

Portwood Member of the New Albany Shale over the Boyle Formation (Middle Devonian; Drowning Creek East outcrop, Estill County, Kentucky, USA) 2
by James St. John

Quaternary gravel over Jurassic red shale (Salina Canyon, Utah, USA) 1
by James St. John

Fossil colonial corals (Marblehead Member, Columbus Limestone, Middle Devonian; lakehore outcrop near Marblehead Lighthouse, Ottawa County, Ohio, USA) 5
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 8
by James St. John

Fossil colonial coral (Marblehead Member, Columbus Limestone, Middle Devonian; lakehore outcrop near Marblehead Lighthouse, Ottawa County, Ohio, USA) 17
by James St. John

Columbus Limestone (Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 7
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 11
by James St. John

Precambrian-Cambrian nonconformity (Peerless Formation over Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 6
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 10
by James St. John

Cowbell Member (Borden Formation, Lower Mississippian; Clack Mountain Road Outcrop, south of Morehead, Kentucky, USA) 7
by James St. John

Columbus Limestone (Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 9
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 20
by James St. John

Burrowed & rippled sandstone (Parachilna Formation, Lower Cambrian; Three Sisters Range, South Australia) 3
by James St. John

Quaternary gravel over Jurassic red shale (Salina Canyon, Utah, USA) 6
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 18
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 9
by James St. John

Columbus Limestone (Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 8
by James St. John

Juntan firmas en Villa Urquiza para la inauguración de las estaciones de subte y por la devolución del nombre original a la estación Juan Manuel de Rosas
by Nicolás Eduardo Feredjian

De Chelly Sandstone (Lower Permian; Canyon de Chelly, Arizona, USA) 34
by James St. John

Quaternary gravel over tilted Arapien Formation (Salina Canyon, Utah, USA) 1
by James St. John

Quaternary gravel over tilted Arapien Formation (Salina Canyon, Utah, USA) 8
by James St. John

Limestones (Warix Run Member, Slade Formation, Upper Mississippian; Rt. 1274-Rt. 801 outcrop, southwest of Morehead, Kentucky, USA) 3
by James St. John

Precambrian-Cambrian nonconformity (Peerless Formation over Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 3
by James St. John

Slade Formation over Cowbell Member (Mississippian; Route 519 Outcrop, south of Morehead, Kentucky, USA) 4
by James St. John

Cowbell Member (Borden Formation, Lower Mississippian; Clack Mountain Road Outcrop, south of Morehead, Kentucky, USA) 5
by James St. John

Rippled sandstone (Rawnsley Quartzite, Ediacaran; Three Sisters Range, South Australia) 5
by James St. John

Precambrian-Cambrian nonconformity (Manitou Limetone over Peerless Formation over Sawatch Sandstone over Pikes Peak Granite; Manitou Avenue roadcut, Manitou Springs, Colorado, USA) 8
by James St. John

Slade Formation over Cowbell Member (Mississippian; Route 519 Outcrop, south of Morehead, Kentucky, USA) 6
by James St. John

Slade Formation over Cowbell Member (Mississippian; Route 519 Outcrop, south of Morehead, Kentucky, USA) 7
by James St. John

Quaternary gravel over Jurassic red shale (Salina Canyon, Utah, USA) 2
by James St. John

Rippled sandstone (Rawnsley Quartzite, Ediacaran; Three Sisters Range, South Australia) 4
by James St. John

Favositid coral in fossiliferous limestone (Columbus Limestone, Middle Devonian; southern shore of Kelleys Island, Lake Erie, Ohio, USA) 2
by James St. John

Cross-bedded calcarenite limestones (Warix Run Member, Slade Formation, Upper Mississippian; Rt. 1274-Rt. 801 outcrop, southwest of Morehead, Kentucky, USA) 1
by James St. John

Cross-bedded calcarenite limestones (Warix Run Member, Slade Formation, Upper Mississippian; Rt. 1274-Rt. 801 outcrop, southwest of Morehead, Kentucky, USA) 4
by James St. John

Cross-bedded calcarenite limestones (Warix Run Member, Slade Formation, Upper Mississippian; Rt. 1274-Rt. 801 outcrop, southwest of Morehead, Kentucky, USA) 9
by James St. John

Favositid coral in fossiliferous limestone (Columbus Limestone, Middle Devonian; southern shore of Kelleys Island, Lake Erie, Ohio, USA) 1
by James St. John

Cowbell Member (Borden Formation, Lower Mississippian; Clack Mountain Road Outcrop, south of Morehead, Kentucky, USA) 6
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Manitou Avenue roadcut, Manitou Springs, Colorado, USA) 5
by James St. John

Favositid coral in fossiliferous limestone (Columbus Limestone, Middle Devonian; southern shore of Kelleys Island, Lake Erie, Ohio, USA) 3
by James St. John

Rippled sandstone (Rawnsley Quartzite, Ediacaran; Three Sisters Range, South Australia) 3
by James St. John

Cowbell Member (Borden Formation, Lower Mississippian; Clack Mountain Road Outcrop, south of Morehead, Kentucky, USA) 4
by James St. John

Quaternary gravel over tilted Arapien Formation (Salina Canyon, Utah, USA) 7
by James St. John