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Muscatatuck Group
Stratigraphic range: Devonian
Type	Group
Sub-units	Northern Indiana Traverse Formation Detroit River Formation Southern Indiana, Illinois and Kentucky North Vernon Limestone Beechwood Limestone Silver Creek Limestone Speed Member Jeffersonville Limestone Dutch Creek Sandstone Member Geneva Dolomite Member Vernon Fork Member Fraunfelter
Underlies	New Albany Shale and Antrim Shale in Northern Indiana
Overlies	New Harmony Group in Southern Indiana Wabash Formation (Salina Group) Elsewhere
Lithology
Primary	Dolomite,]
Other	Sandstone Anhydrite Gypsum
Location
Region	Indiana  Illinois  Kentucky
Country	United States
Type section
Named for	Its many exposures along the Muscatatuck River
Named by	Shaver, 1974

The Muscatatuck Group is a Middle Devonian Aged unit found in Illinois, Indiana and Kentucky. It is characterized by being predominantly made up of Dolomite and limestone.

Stratigraphy

The Muscatatuck underlies the New Albany Shale throughout of its extent, except in Northern Indiana where it underlies the Antrim Shale.

The North Vernon Limestone is a geologic formation in Indiana. Also called the Sellersburg Limestone, this term however is no longer in use. Originally called "Corniferous Limestone" it was defined as the unit between the New Albany Shale and the Jeffersonville Lime. The North Vernon has two members.

The Beechwood Limestone Member. Defined by its Crinoidal Beds.

The Silver Creek Member is massive and mostly grey, often argillaceous.

The Speed member is a shaley limestone.

The Jeffersonville Limestone is a coarse grained, dark gray, thick bedded, fossiliferous limestone.

Industrial Products

Quarries in Pulaski and Shelby Counties produce Agricultural lime, agragrate (crushed stone) and rip rap. Also mined are Portland cement products, industrial lime and Pugmillmaterial.

Several counties produce oil from the Muscatatuck in Indiana.

References

1. ^ Shaver, Robert (1974). "The Muscatatuck Group (New Middle Devonian Name) in Indiana". Department of Natural Resources Geologic Survey. 3.
2. Shaver, R.H.; Burger, A.M. (1970). "Compendium of rock-unit stratigraphy in Indiana". USGS. Bulletin 43 – via National Geologic Map Database.
3. "Muscatatuck Group". legacy.igws.indiana.edu. Retrieved 2024-03-01.

• Geology of Indiana
• Devonian Indiana
• Devonian Illinois