Lockport Dolomite

Dolomite, shades of white to medium gray, medium to massive bedded, fine to coarse crystalline; fossiliferous; vuggy.
State Ohio
Name Lockport Dolomite
Geologic age Silurian
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone (Bed)shades of white to medium gray, medium to massive bedded, fine to coarse crystalline; fossiliferous; vuggy.
Comments Secondary unit description from USGS Lexicon website (ref. OH017) and OH005:Rock units forming the bedrock in the Maumee, Lucas Co., OH, and that crop out in the walls of a quarry are the Lockport Dolomite and the Greenfield Dolomite. The two form a thick reef complex roughly 600 m in diameter and about 68 m thick. The Lockport contains multistory stromatolite, thrombolite, and coral-microbialite reefs that were probably formed in a subtidal setting within a hypersaline lagoon. Lockport may be Wenlockian or Llandoverian to Ludlovian. In contrast to the mostly massive Lockport, the Greenfield at Maumee quarry is well bedded. It is Wenlockian, according to Shaver (1991), but fig. 16 of this report (after Howell, 1993) depicts the Greenfield as Llandoverian with a significant hiatus between deposition of the two units (Kahle, 1994).
References

Slucher, E.R., (principal compiler), Swinford, E.M., Larsen, G.E., and others, with GIS production and cartography by Powers, D.M., 2006, Bedrock geologic map of Ohio: Ohio Division of Geological Survey Map BG-1, version 6.0, scale 1:500,000.

Kahle, C.F., 1994, Facies and evolution of a Silurian coral-microbialite reef complex, Maumee, Ohio, USA: Journal of Sedimentary Research, v. A6, no. 4, p. 711-725.

USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/

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NGMDB product
Counties Allen - Auglaize - Champaign - Clark - Darke - Hancock - Hardin - Logan - Lucas - Madison - Marion - Mercer - Miami - Montgomery - Ottawa - Preble - Sandusky - Seneca - Shelby - Union - Van Wert - Wood - Wyandot