Geologic units in Indiana (state in United States)

Additional scientific data in this geographic area

Wabash Formation (Silurian) at surface, covers 14 % of this area

Limestone, dolomite, and argillaceous dolomite

Borden Group (Mississippian) at surface, covers 12 % of this area

Mostly siltstone; lenses of crinodial limestone in upper part. Much cherty and silty limestone and dolomite in northwest. NP, top of New Providence Shale

Muscatatuck Group (Devonian) at surface, covers 12 % of this area

Limestone and dolomite

Raccoon Creek Group (Pennsylvanian) at surface, covers 9 % of this area

Mostly shale and sandstone; also includes thin beds of limestone, clay, and coal. B, Buffaloville Coal Member; LB, Lower Block Coal Member

Louisville Limestone through Brassfield Limestone (Silurian) at surface, covers 6 % of this area

Sexton Creek Limestone at base in Kentland area and on cross-section

Ellsworth Shale (Devonian-Mississippian) at surface, covers 6 % of this area

Green shale; some black shale in lower part

Antrim Shale (Devonian) at surface, covers 6 % of this area

Black shale; gray shale and limestone in lower part

New Albany Shale (Devonian-Mississippian) at surface, covers 5 % of this area

Black and greenish-gray shale

Patoka and Shelburn Formations (Pennsylvanian) at surface, covers 5 % of this area

Mostly shale and sandstone; also includes thin beds of limestone and coal. WF, top of West Franklin member

Carbondale Group (Pennsylvanian) at surface, covers 4 % of this area

Mostly shale and sandstone; also includes thin beds of limestone, clay, and coal. S, Springfield Coal Member

Blue River Group (Mississippian) at surface, covers 4 % of this area

Mostly micritic, skeletal, and oolitic limestone

Dillsboro Formation (Ordovician) at surface, covers 3 % of this area

Skeletal limestone and calcareous shale

Pleasant Mills Formation (Silurian) at surface, covers 3 % of this area

Dolomite, limestone, and argillaceous dolomite

Whitewater Formation (Ordovician) at surface, covers 3 % of this area

Skeletal limestone and calcareous shale; dolomitic mudstone (S, Saluda Member) at base

Coldwater Shale (Mississippian) at surface, covers 2 % of this area

Mostly gray shale

Sanders Group (Mississippian) at surface, covers 2 % of this area

Mostly skeletal limestone, cherty in lower part

West Baden Group (Mississippian) at surface, covers 1 % of this area

Shale, sandstone, and micritic and skeletal limestone

Stephensport Group (Mississippian) at surface, covers 1 % of this area

Sandstone, micritic and skeletal limestone, and shale

Bond Formation (Pennsylvanian) at surface, covers 0.9 % of this area

Mostly shale and sandstone; also includes thin beds of limestone and coal

Buffalo Wallow Group (Mississippian) at surface, covers 0.6 % of this area

Mostly shale and sandstone; also includes thin beds of micritic limestone. L, Leopold Limestone member

Ordovician rocks, undifferentiated (Silurian) at surface, covers 0.3 % of this area

Shale and limestone; upper part of Maquoketa Group in deep buried valleys; Maquoketa to upper part of Knox Supergroup in Kentland area

Kope Formation (Ordovician) at surface, covers 0.3 % of this area

Shale and thin skeletal limestone

Mattoon Formation (Pennsylvanian) at surface, covers < 0.1 % of this area

Mostly shale and sandstone; also includes thin beds of coal

Lexington Limestone (Ordovician) at surface, covers < 0.1 % of this area

Micritic and skeletal limestone

Coldwater Shale (Mississippian) at surface, covers < 0.1 % of this area

Coldwater Shale

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers < 0.1 % of this area

Shelburn-Patoka Formations undivided.

Bond Formation (Pennsylvanian (Kasimovian)) at surface, covers < 0.1 % of this area

Bond Formation

Ellsworth Shale (Late Devonian) at surface, covers < 0.1 % of this area

Ellsworth Shale

Mattoon Formation (Pennsylvanian (Kasimovian)) at surface, covers < 0.1 % of this area

Mattoon Formation.

Silurian System undivided (Silurian (Llandovery to Pridoli)) at surface, covers < 0.1 % of this area

Silurian System undivided, includes Sexton Creek Limestone, St. Clair Limestone, and Moccasin Springs Formation in southern Illinois; includes Wilhelmi Formation, Elwood Dolomite, Kankakee Dolomite, Joliet Dolomite, Sugar Run Dolomite, and Racine Dolomite in northeastern Illinois; includes Mosalem, Tete des Morts, Blanding, Sweeney, Marcus, and Racine Dolomites in northwestern Illinois.

Tradewater Formation (Pennsylvanian (Bashkirian to Moscovian)) at surface, covers < 0.1 % of this area

Tradewater Formation

Antrim Shale (Late Devonian) at surface, covers < 0.1 % of this area

Antrim Shale

Alluvium (Pleistocene to Holocene) at surface, covers < 0.1 % of this area

Alluvium; includes glacial deposits along the Ohio River and its tributaries west of Cannelton locks

Glacial deposits, undifferentiated (Pleistocene to Holocene) at surface, covers < 0.1 % of this area

Glacial deposits, undifferentiated; shown locally

New Albany Shale, Blocher Shale, Sylamore Sandstone, Selmier Shale, Sweetland Creek Shale, Grassy Creek Shale, Saverton Shale, and Louisiana Limestone (Middle Devonian (Givetian) to Upper Devonian (Fammenian)) at surface, covers < 0.1 % of this area

New Albany Shale, Blocher Shale, Sylamore Sandstone, Selmier Shale, Sweetland Creek Shale, Grassy Creek Shale, Saverton Shale, and Louisiana Limestone.

Salina Group (Silurian) at surface, covers < 0.1 % of this area

Dolomite, gray, yellow-gray to olive-gray, laminated to thin bedded; occasional thin bed and laminae of dark gray shale and anhydrite and/or gypsum; brecciated zones in part.

Ste. Genevieve and St. Louis Limestones, undivided (Mississippian) at surface, covers < 0.1 % of this area

Ste. Genevieve and St. Louis Limestones, undivided; includes Salem Limestone west of Christian County

Carbondale Formation (Pennsylvanian (Moscovian to Kasimovian)) at surface, covers < 0.1 % of this area

Carbondale Formation.

Borden Siltstone (Mississippian (Tourniaisian to Visean)) at surface, covers < 0.1 % of this area

Borden Siltstone, includes Chouteau Limestone in east-central Illinois.

Kope Formation (Ordovician) at surface, covers < 0.1 % of this area

Shale (75%) and limestone (25%) interbedded; gray to bluish gray weathers light gray to yellowish gray; planar, thin to thick bedded; 200 to 260 feet thick.

Point Pleasant Formation (Ordovician) at surface, covers < 0.1 % of this area

Limestone (60%) and shale (40%) interbedded; gray to bluish gray weathers light gray; planar to lenticular, thin to medium bedded; 0 to 80 feet thick.

Drakes, Whitewater and Liberty Formations, Undivided (Ordovician) at surface, covers < 0.1 % of this area

Drakes Formation; shale (90%) and limestone/dolomite (10%), interbedded; gray and maroon, weathers yellowish gray; planar to irregular, thin to thick bedded; 20 to 30 feet thick. Whitewater Formation, limestone (60%) and shale (40%) interbedded; gray weathers yellowish gray; irregular to wavy, thin to medium bedded; 20 to 80 feet thick. Liberty Formation, limestone (50%) and shale (50%), interbedded; gray weathers yellowish gray; planar to irregular, thin to medium bedded; 20 to 40 feet thick. Interval ranges from 60 to 150 feet in thickness. The Geological Survey of Ohio recognizes the Cincinnati Group proposed by Meek and Worthen (1865), but at this time retains it as an informal term. The unit will be formally reinstated as a lithostratigraphic term after revision of its lower boundary and minor lithologic redescription of its units are completed. The ten formations included in the group are the (ascending) Clays Ferry Formation, the Kope Formation, the Fairview Formation, the Miamitown Shale, the Grant Lake Limestone, the Arnheim Formation, the Waynesville Formation, the Liberty Formation, the Whitewater Formation, and the Drakes Formation. Six members have been identified in the course of field mapping: the Point Pleasant Tongue of the Clays Ferry, the informal Bellevue, Corryville, Mount Auburn, and Straight Creek members of the Grant Lake Limestone, and the Preachersville Member of the Drakes Formation. The Backbone Creek and Elk Creek beds are recognized as excellent stratigraphic marker beds (Shrake and others, 1988).

Waynesville and Arnheim Formations, Undivided (Ordovician) at surface, covers < 0.1 % of this area

Waynesville Formation, shale (70%) and limestone (30%) interbedded; gray to bluish gray weathers light gray; planar to irregular, thin to thick bedded; 90 to 120 feet thick. Arnheim formation, shale (60%) and limestone (40%) interbedded; gray to bluish gray weathers light gray; planar, wavy, irregular, to nodular (in upper portion), thin to thick bedded; 50 to 100 feet thick. Contains multiple sedimentary cycles consisting of the alternation of shale and limestone displaying planar to irregular bedding with limestone and shale exhibiting wavy to nodular bedding. Ranges from 140 to 220 feet. The Geological Survey of Ohio recognizes the Cincinnati Group proposed by Meek and Worthen (1865), but at this time retains it as an informal term. The unit will be formally reinstated as a lithostratigraphic term after revision of its lower boundary and minor lithologic redescription of its units are completed. The ten formations included in the group are the (ascending) Clays Ferry Formation, the Kope Formation, the Fairview Formation, the Miamitown Shale, the Grant Lake Limestone, the Arnheim Formation, the Waynesville Formation, the Liberty Formation, the Whitewater Formation, and the Drakes Formation. Six members have been identified in the course of field mapping: the Point Pleasant Tongue of the Clays Ferry, the informal Bellevue, Corryville, Mount Auburn, and Straight Creek members of the Grant Lake Limestone, and the Preachersville Member of the Drakes Formation. The Backbone Creek and Elk Creek beds are recognized as excellent stratigraphic marker beds (Shrake and others, 1988).

Grant Lake and Fairview Formations, Miamitown Shale, Undivided (Ordovician) at surface, covers < 0.1 % of this area

Limestone (50%) and shale (50%), interbedded; gray to bluish-gray weathers light gray to yellowish-gray;, planar to lenticular, thin to medium bedded in lower half; wavy to irregular to nodular, thin to thick bedded in upper half; fossiliferous. Interval of shale (90%) with limestone (10%), as much as 35 feet thick, near middle of unit.

Muscatatuck Group (Middle Devonian (Eifelian to Givetian)) at surface, covers < 0.1 % of this area

Muscatatuck Group, includes Grand Tower Limestone and St. Laurent (Alto and Lingle) Formation in southern Illinois; includes Detroit River Formation, Wapsipinicon Limestone, and Cedar Valley Limestone in northern and western Illinois.

Rocks of Chesterian age, upper part (Upper Mississippian) at surface, covers < 0.1 % of this area

Rocks of Chesterian age, upper part

Garrard Siltstone and Kope and Clays Ferry Formations, undivided (Ordovician) at surface, covers < 0.1 % of this area

Garrard Siltstone and Kope and Clays Ferry Formations, undivided

Detroit River Group (Devonian) at surface, covers < 0.1 % of this area

Dolomite; brown to gray; medium to thick bedded; laminated; nodules or interbeds of anhydrite and/or gypsum; basal part becomes sandy dolomite or fine-grained sandstone; as much as 170 feet thick.

Rocks of Chesterian age, lower part (Upper Mississippian) at surface, covers < 0.1 % of this area

Rocks of Chesterian age, lower part