osagean

Turgite on sandstone (Vinton Member, Logan Formation, Lower Mississippian; Hanover Pit, Licking County, Ohio, USA) 2
by James St. John

Gray shale (Fort Payne Formation, Lower Mississippian; Burkesville West Rt. 90 roadcut, Kentucky, USA) 7
by James St. John

Dolostone with small vugs (Vinton Member, Logan Formation, Lower Mississippian; Hanover Pit, Licking County, Ohio, USA) 1
by James St. John

Truncated bedding in sandstone (Vinton Member, Logan Formation, Lower Mississippian; Mohawk Dam emergency spillway, western Coshocton County, Ohio, USA) 13
by James St. John

Zoophycos in pelletal glauconite beds (Floyds Knob Bed, Fort Payne Formation, Lower Mississippian; Burkesville West Rt. 90 roadcut, Kentucky, USA) 2
by James St. John

Crinoid stems (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 10
by James St. John

Small mud nodules (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut, northeast of Frazeysburg, Ohio, USA) 4
by James St. John

Shales (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut, northeast of Frazeysburg, Ohio, USA) 5
by James St. John

Small mud nodules (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut, northeast of Frazeysburg, Ohio, USA) 2
by James St. John

Horizontal burrows (Vinton Member, Logan Formation, Lower Mississippian; Mohawk Dam roadcut, northwest of Nellie, Ohio, USA) 7
by James St. John

Zoophycos trace fossil (Vinton Member, Logan Formation, Lower Mississippian; Dillon Reservoir railroad cut, Muskingum County, Ohio, USA) 7
by James St. John

Brachiopod (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 4
by James St. John

Mudchips in sandstone (Vinton Member, Logan Formation, Lower Mississippian; Hanover Pit, Licking County, Ohio, USA) 4
by James St. John

Black Hand Sandstone (Lower Mississippian; Ash Cave, Hocking Hills, Ohio, USA) 1
by James St. John

Zoophycos trace fossil (Logan Formation, Lower Mississippian; Rt. 35 roadcut, northeast of Rittenours, Ohio, USA) 11
by James St. John

Black Hand Sandstone (Lower Mississippian; Rock House, Hocking Hills, Ohio, USA) 6
by James St. John

Small mud nodules (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut, northeast of Frazeysburg, Ohio, USA) 1
by James St. John

Byer Sandstone (Lower Mississippian; State Farm Quarry, Newark, Ohio, USA) 3
by James St. John

Crinoid-rich shales (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 1
by James St. John

Trace fossils in sandstone (Logan Formation, Lower Mississippian; Rt. 35 roadcut, northeast of Rittenours, Ohio, USA) 2
by James St. John

Sandstone-dominated overburden over "Middle Blue" shales (Vinton Member, Logan Formation, Lower Mississippian; Hanover Pit, Licking County, Ohio, USA) 13
by James St. John

Rockford Limestone over Maury Shale (Lower Mississippian; Burkesville West Rt. 90 roadcut, Kentucky, USA) 2
by James St. John

Brachiopod (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 3
by James St. John

Quartzose sandstones (Byer Sandstone over Black Hand Sandstone, Lower Mississippian; old quarry at Black Hand Gorge, Ohio, USA) 5
by James St. John

Quartzose sandstone (Black Hand Sandstone, Lower Mississippian; Black Hand Gorge, Ohio, USA) 11
by James St. John

Shales (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut, northeast of Frazeysburg, Ohio, USA) 6
by James St. John

Carbonate concretions (Vinton Member, Logan Formation, Lower Mississippian; Mohawk Dam emergency spillway, western Coshocton County, Ohio, USA) 2
by James St. John

Sandstone (Vinton Member, Logan Formation, Lower Mississippian; inactive highwall at old Hanover Pit, Licking County, Ohio, USA) 6
by James St. John

Structurally tilted sedimentary rocks (Price Formation, Lower Mississippian; Cloyds Mountain roadcut, Valley Coalfield, Virginia, USA) 1
by James St. John

"Liesegang banding" (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut northeast of Frazeysburg, Ohio, USA) 1
by James St. John

Agaricocrinus sp. (fossil crinoid) (Fort Payne Formation, Lower Mississippian; Lake Cumberland, Kentucky, USA) 3
by James St. John

Shales (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut, northeast of Frazeysburg, Ohio, USA) 8
by James St. John

Ferruginous dolostone & pelletal glauconite beds (Floyds Knob Bed, Fort Payne Formation, Lower Mississippian; Burkesville West Rt. 90 roadcut, Kentucky, USA) 1
by James St. John

Crinoid stems (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 12
by James St. John

Small mud nodule (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut, northeast of Frazeysburg, Ohio, USA) 9
by James St. John

Quartzose sandstone (Black Hand Sandstone, Lower Mississippian; Black Hand Rock, Licking Gorge, Ohio, USA) 7
by James St. John

Crinoid stems (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 11
by James St. John

Mississippian-Pennsylvanian unconformity (Rt. 16 roadcut northeast of Frazeysburg, Ohio, USA) 6
by James St. John

Shale ("Middle Blue", Vinton Member, Logan Formation, Lower Mississippian; Hanover Pit, Licking County, Ohio, USA) 2
by James St. John

Quartzose sandstone (Black Hand Sandstone, Lower Mississippian; railroad cut west of Black Hand Gorge, Ohio, USA) 2
by James St. John

Mississippian-Pennsylvanian unconformity (Rt. 16 roadcut northeast of Frazeysburg, Ohio, USA) 3
by James St. John

Trace fossils in fine-grained sandstone (Henley Member, Borden Formation, Lower Mississippian; Tener Mountain roadcut, southern Ohio, USA) 16
by James St. John

Spiriferid brachiopod (Fort Payne Formation, Lower Mississippian; Burkesville West Rt. 90 roadcut, Kentucky, USA) 4
by James St. John

Quartzose sandstone (Black Hand Sandstone, Lower Mississippian; old quarry at Black Hand Gorge, Ohio, USA) 3
by James St. John

Small mud nodule (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut, northeast of Frazeysburg, Ohio, USA) 8
by James St. John

Quartzose sandstone (Black Hand Sandstone, Lower Mississippian; Black Hand Rock, Licking Gorge, Ohio, USA) 2
by James St. John

Fossiliferous sandstone (Logan Formation, Lower Mississippian; eastern Ohio, USA) 6
by James St. John

Quartzose sandstone (Black Hand Sandstone, Lower Mississippian; Black Hand Rock, Licking Gorge, Ohio, USA) 5
by James St. John

Brachiopod (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 5
by James St. John

Mudshales (Henley Member, Borden Formation, Lower Mississippian; Tener Mountain roadcut, southern Ohio, USA) 8
by James St. John

Reefs Through Time & Space
by James St. John

Shales (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut, northeast of Frazeysburg, Ohio, USA) 7
by James St. John

Encrinite (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 16
by James St. John

Auloporid corals in limestone (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 10
by James St. John

Siderite ironstone nodule (Lower Mississippian or Lower Pennsylvanian; Rt. 16 roadcut northeast of Frazeysburg, Ohio, USA)
by James St. John

Dry ephemeral waterfall over quartzose sandstone (Black Hand Sandstone, Lower Mississippian; railroad cut west of Black Hand Gorge, Ohio, USA) 1
by James St. John

Keokuk Chert (Keokuk Formation, Lower Mississippian; midwestern USA) 26
by James St. John

Quartzose sandstone (Black Hand Sandstone, Lower Mississippian; Black Hand Rock, Licking Gorge, Ohio, USA) 8
by James St. John

Small mud nodules (Vinton Member, Logan Formation, Lower Mississippian; Rt. 16 roadcut, northeast of Frazeysburg, Ohio, USA) 5
by James St. John

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