Logan Formation
| Logan Formation Stratigraphic range: Lower Carboniferous (early Osagean) |
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|---|---|
| File:LoganFormationWooster.JPG
Logan Formation exposed in Wooster, Ohio.
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| Type | Sedimentary |
| Unit of | Waverly Group |
| Sub-units | Berne, Byer, Allenville, Vinton |
| Underlies | Maxville Limestone |
| Overlies | Cuyahoga Formation; Black Hand Sandstone |
| Thickness | 0 to 40 m |
| Lithology | |
| Primary | sandstone, siltstone, conglomerate |
| Other | shale |
| Location | |
| Region | Appalachian Basin |
| Country | United States |
| Extent | Ohio, West Virginia |
| Type section | |
| Named for | Logan, Ohio |
| Named by | Andrews, 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
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LoganConglomerateWooster.jpg
Conglomerate in the Logan Formation exposed in Wooster, Ohio, USA.
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LoganBrachiopodsWooster.jpg
Brachiopod internal and external molds in the Logan Formation in Wooster, Ohio.
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The bivalve Aviculopecten subcardiformis from the Logan Formation in Wooster, Ohio (external mold).
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Bivalves (Aviculopecten) and brachiopods (Syringothyris) in the Logan Formation in Wooster, Ohio.
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Cross-bedding and scour in the Logan Formation of Jackson County, Ohio.
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Schizodus medinaensis.JPG
Schizodus medinaensis; a bivalve from the Logan Formation in Wooster, Ohio (internal mold).
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Syringothyris sp.; a spiriferid brachiopod from the Logan Formation in Wooster, Ohio (internal mold).
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Syringothyris bored Wooster Carboniferous.jpg
Syringothyris external mold with borings; Logan Formation; Wooster, Ohio.
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Helminthopsis ichnosp.; a trace fossil from the Logan Formation in Wooster, Ohio.
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Crinoid calyx from the Logan Formation in Wooster, Ohio, with a conical platyceratid gastropod (Palaeocapulus acutirostre) attached.
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