Logan Formation

Logan Formation
Logan Formation
Osagean) PreꞒ Ꞓ O S D C P T J K Pg N
	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

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

ammonoids, conodonts

and miospores (Clayton et al., 1998; Matchen and Kammer, 2006).

References

Andrews, E.B. (1870). "Report of progress in the second district, Part II, IN Report of progress in 1869". Ohio Division of Geological Survey Report of Progress. 2nd Series: 1091–1094.

Bork, K.B.; Malcuit, R.J. (1979). "Paleoenvironments of the Cuyahoga and Logan Formations (Mississippian) of central Ohio". Geological Society of America Bulletin. 90: 89–113.
doi:10.1130/0016-7606(1979)90<1091:potcal>2.0.co;2
.

Clayton, G.; Manger, W.L.; Owens, B. (1998). "Mississippian (Lower Carboniferous) miospores from the Cuyahoga and Logan Formations of northeastern Ohio, USA". Journal of Micropalaeontology. 17: 183–191.
doi:10.1144/jm.17.2.183
.

Matchen, D.L.; Kammer, T.W. (2006). "Incised valley fill interpretation for Mississippian Black Hand Sandstone, Appalachian Basin, USA: Implications for glacial eustacy at Kinderhookian-Osagean (Tn2-Tn3) boundary". Sedimentary Geology. 191: 89–113.
doi:10.1016/j.sedgeo.2006.02.002
.

Conglomerate in the Logan Formation exposed in Wooster, Ohio, USA.
Brachiopod internal and external molds in the Logan Formation in Wooster, Ohio.
The bivalve Aviculopecten subcardiformis from the Logan Formation in Wooster, Ohio (external mold).
Bivalves (Aviculopecten) and brachiopods (Syringothyris) in the Logan Formation in Wooster, Ohio.
Cross-bedding and scour in the Logan Formation of Jackson County, Ohio.
Schizodus medinaensis; a
bivalve
from the Logan Formation in Wooster, Ohio (internal mold).
Syringothyris sp.; a spiriferinid brachiopod from the Logan Formation in Wooster, Ohio (internal mold).
Syringothyris external mold with borings; Logan Formation; Wooster, Ohio.
Syringothyris texta (Hall 1857), dorsal view, internal mold. Lower Carboniferous of Wooster, Ohio.
Helminthopsis ichnosp.; a trace fossil from the Logan Formation in Wooster, Ohio.
Crinoid calyx from the Logan Formation in Wooster, Ohio, with a conical platyceratid gastropod (Palaeocapulus acutirostre) attached.

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