Logan Formation

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Logan Formation
Stratigraphic range: Lower Carboniferous (early Osagean)
LoganFormationWooster.JPG
Logan Formation exposed in Wooster, Ohio.
TypeSedimentary
Unit of Waverly Group
Sub-unitsBerne, Byer, Allenville, Vinton
Underlies Maxville Limestone, Pottsville Group, and Rushville Shale
Overlies Cuyahoga Formation; Black Hand Sandstone
Thickness0 to 40 m
Lithology
Primary sandstone, siltstone, conglomerate
Other shale
Location
Region Appalachian Basin
CountryUnited States
ExtentOhio, West Virginia
Type section
Named for Logan, Ohio
Named byAndrews, 1870

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