File:Carbonate concretions (Vinton Member, Logan Formation, Lower Mississippian; Mohawk Dam emergency spillway, western Coshocton County, Ohio, USA) 1.jpg

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English: Carbonate concretions in the Mississippian of Ohio, USA.

The Vinton Member is the uppermost of four stratigraphic units in the Mississippian-aged, siliciclastics-dominated Logan Formation of eastern Ohio. Ascending from the base, they are the Berne Conglomerate Member, the Byer Sandstone Member, the Allensville Member, and the Vinton Member. The Vinton is dominated by siltstones but sandstones and shales are also present. The dark rusty-colored, irregularly-rounded masses shown above are relatively large carbonate concretions in siltstones.

Concretions are post-depositional structures found in some sedimentary successions, particularly in shales. They vary in mineralogy, size, and shape, but often have slightly flattened spheroidal shapes. They typically form by post-depositional mineralization around some nucleus (a rock fragment or fossil fragment).

Stratigraphy: Vinton Member, upper Logan Formation, Osagean Stage, upper Lower Mississippian

Locality: Mohawk Dam emergency spillway, northwest of the town of Nellie, western Coshocton County, eastern Ohio, USA (vicinity of 40º 21' 26.42" North latitude, 82º 04' 57.97" West longitude)
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Author James St. John

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