Geologic formation in Iowa and Minnesota, United States.
Lithograph City Formation |
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Stratigraphic range: Devonian |
Type | Formation |
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Unit of | Cedar Valley Group |
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Location |
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Country | United States |
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Extent | Iowa and Minnesota |
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The Lithograph City Formation is a geologic formation in Iowa, part of the Cedar Valley Group. It preserves fossils dating back to the Devonian period. The formation is composed of dolomite and limestone, with many fossils and vugs in the lower part, while the upper part contains few fossils.[1][2]
The formation is named after exposures in the former company town of Lithograph City, where quarries were opened to exploit the high-quality lithographic limestone found in parts of this formation.[3]
See also
- Earth sciences portal
- Iowa portal
- Paleontology portal
References
- ^ Bill J. Bunker, Brian J. Witzke and Jed Day, Upper Cedar Valley Stratigraphy North Central Iowa Lithograph City Formation, Guidebook 44, Geological Society of Iowa, Apr. 27, 1986.
- ^ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
- ^ A. B. Hoen, Discussion of the Requisite Qualities of Lithographic Limestone, with Report on Tests of the Lithographic Stone of Mitchell County, Iowa, Iowa Geological Survey Annual Report, 1902, Des Moines, 1903; pages 339-352.
Chronostratigraphy of Minnesota
Ph | Cz | Q | - Glacial and post-glacial unconsolidated deposits
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Mz | K | Upper | - unnamed Upper? Cretaceous formations, western and southeastern Minnesota
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Pz | |
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pЄ | ♇ | Y | - Fond du Lac Formation
- Hinckley Sandstone
- North Shore Volcanic Group
- Puckwunge Conglomerate
- Solor Church Formation (subsurface only)
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X | - Trommald Formation
- Virginia Formation
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