disconformity

Shinarump Conglomerate over De Chelly Sandstone (Upper Triassic over Lower Permian; Canyon de Chelly, Arizona, USA) 16
by James St. John

Pottsville Group over Maxville Limestone (East Fultonham Pit, Muskingum County, Ohio, USA) 4
by James St. John

Pottsville Group over Maxville Limestone (East Fultonham Pit, Muskingum County, Ohio, USA) 2
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 21
by James St. John

Shinarump Conglomerate over De Chelly Sandstone (Upper Triassic over Lower Permian; Canyon de Chelly, Arizona, USA) 14
by James St. John

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

Mississippian-Pennsylvanian unconformity ("Sharon" Conglomerate over Logan Formation; Jackson North roadcut, Ohio, USA) 7
by James St. John

Pyrite atop chert nodule (Delaware Limestone, Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 1
by James St. John

Fossiliferous limestone (Columbus Limestone, Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 11
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 14
by James St. John

Shinarump Conglomerate over De Chelly Sandstone (Upper Triassic over Lower Permian; Canyon de Chelly, Arizona, USA) 15
by James St. John

Columbus Limestone (Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 5
by James St. John

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

Bleeding unconformity (Chattanooga Shale over Cumberland Formation; Burkesville West Rt. 90 roadcut, Kentucky, USA) 5
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 19
by James St. John

Fossiliferous limestone (Columbus Limestone, Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 3
by James St. John

Shales (Nada Member, Borden Formation, Lower Mississippian; Rt. 1274-Rt. 801 outcrop, southwest of Morehead, Kentucky, USA) 7
by James St. John

Slade Formation over Cowbell Member (Mississippian; Clack Mountain Road Outcrop, south of Morehead, Kentucky, USA) 1
by James St. John

Delaware Limestone over Columbus Limestone (Middle Devonian; next to Millikin Falls, Columbus, Ohio, USA) 2
by James St. John

Fossiliferous limestone (Columbus Limestone, Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 14
by James St. John

Columbus Limestone-Delaware Limestone contact (Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 2
by James St. John

New Albany Shale over North Vernon Limestone (Upper Devonian over Middle Devonian; Interstate 65 entrance ramp roadcut, Bullitt County, Kentucky, USA) 1
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 8
by James St. John

Black chert nodule (Delaware Limestone, Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 7
by James St. John

Mississippian-Pennsylvanian unconformity ("Sharon" Conglomerate over Logan Formation; Jackson North roadcut, Ohio, USA) 14
by James St. John

Columbus Limestone-Delaware Limestone boundary bed (Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 1
by James St. John

Shinarump Conglomerate over De Chelly Sandstone (Upper Triassic over Lower Permian; Canyon de Chelly, Arizona, USA) 25
by James St. John

Delaware Limestone over Columbus Limestone (Middle Devonian; next to Millikin Falls, Columbus, Ohio, USA) 1
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 11
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 10
by James St. John

Columbus Limestone (Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 12
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 7
by James St. John

Chert nodule (Delaware Limestone, Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 11
by James St. John

Quaternary gravel over Jurassic red shale (Salina Canyon, Utah, USA) 8
by James St. John

Shinarump Conglomerate over De Chelly Sandstone (Upper Triassic over Lower Permian; Canyon de Chelly, Arizona, USA) 21
by James St. John

Pottsville Group over Maxville Limestone (East Fultonham Pit, Muskingum County, Ohio, USA) 9
by James St. John

Pottsville Group over Maxville Limestone (Black 17 Mine, White Cottage, Ohio, USA) 22
by James St. John

Slade Formation over Cowbell Member (Mississippian; Route 519 Outcrop, south of Morehead, Kentucky, USA) 8
by James St. John

Shales (Nada Member, Borden Formation, Lower Mississippian; Rt. 1274-Rt. 801 outcrop, southwest of Morehead, Kentucky, USA) 5
by James St. John

Delaware Limestone (Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 3
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) 12
by James St. John

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

Columbus Limestone (Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 2
by James St. John

Pottsville Group over Maxville Limestone (Black 17 Mine, White Cottage, Ohio, USA) 18
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 12
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 6
by James St. John

Columbus Limestone (Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 17
by James St. John

Pottsville Group over Maxville Limestone (East Fultonham Pit, Muskingum County, Ohio, USA) 6
by James St. John

Chert nodule (Delaware Limestone, Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 10
by James St. John

Quaternary gravel over Jurassic red shale (Salina Canyon, Utah, USA) 5
by James St. John

Slade Formation over Cowbell Member (Mississippian; Clack Mountain Road Outcrop, south of Morehead, Kentucky, USA) 2
by James St. John

Fossiliferous limestone (Columbus Limestone, Middle Devonian; Emerald Parkway roadcut, Dublin, Ohio, USA) 2
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 1
by James St. John

Fossiliferous limestone (Delaware Limestone, Middle Devonian; Olentangy River at Lazarus Run confluence, Delaware County, Ohio, USA) 3
by James St. John

Pottsville Group over Maxville Limestone (East Fultonham Pit, Muskingum County, Ohio, USA) 1
by James St. John

Precambrian-Cambrian nonconformity (Sawatch Sandstone over Pikes Peak Granite; Ute Trail, Manitou Springs, Colorado, USA) 4
by James St. John

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