Type Sedimentary Thickness 0 to 40 m Region Appalachian Basin Underlies Maxville Limestone | Unit of Waverly Group Other shale Overlies Cuyahoga Formation | |
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Sub-units Berne, Byer, Allenville, Vinton Primary Sandstone, Siltstone, Conglomerate | ||
The Logan Formation is the name given to a Lower Carboniferous (early Osagean) siltstone, sandstone and conglomeratic unit exposed in east-central Ohio and parts of western West Virginia, USA.
Stratigraphy and paleoenvironment
The Logan Formation was named by Andrews (1870) and originally described as a "buff-colored, fine-grained sandstone" above the Waverly Formation and below the Maxville Limestone. Bork and Malcuit (1979) concluded that the Logan Formation was deposited on a shallow marine shelf in a generally transgressing sea. The age of the Logan Formation has been established as early Osagean (Tn3) by the occurrences of brachiopods, ammonoids, conodonts and miospores (Clayton et al., 1998; Matchen and Kammer, 2006).
References
Logan Formation Wikipedia(Text) CC BY-SA