Lithograph City Formation
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]
| Lithograph City Formation Stratigraphic range: Devonian | |
|---|---|
| Type | Formation |
| Unit of | Cedar Valley Group |
| Location | |
| Country | United States |
| Extent | Iowa and Minnesota |
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]
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". Archived from the original on 31 July 2014. Retrieved 8 July 2014.
- 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.
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