Английская Википедия:Brassfield Formation
The Brassfield Formation, named by A.F. Foerste in 1906, is a limestone and dolomite formation exposed in Arkansas,[1] Ohio, Kentucky, Indiana, Tennessee and West Virginia in the United States.[2] It is Early Silurian (Aeronian, Llandoverian) in age and well known for its abundant echinoderms, corals and stromatoporoids.[3] In Ohio, where the unit has escaped dolomitization, the Brassfield is an encrinite biosparite with numerous crinoid species.[4][5]
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Close view of Brassfield Formation near Fairborn, Ohio, showing grains mainly composed of crinoid fragments.
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Phaenopora superba, a bryozoan from the Brassfield Formation.
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Encrinite from the Brassfield Formation (Silurian) near Fairborn, Ohio.
References
Шаблон:Chronostratigraphy of Indiana Шаблон:Chronostratigraphy of Kentucky Шаблон:Chronostratigraphy of Ohio
Шаблон:US-geologic-formation-stub
- ↑ Шаблон:Cite journal
- ↑ Foerste, A.F. 1906. The Silurian, Devonian, and Irvine formations of east-central Kentucky, with an account of their clays and limestones. Geological Survey of Kentucky, Bulletin 7, 369 p.
- ↑ Schneider, K.A. and Ausich, W.I. 2002. Paleoecology of framebuilders in Early Silurian reefs (Brassfield Formation, southwestern Ohio). Palaios 17: 237-248.
- ↑ Ausich, W.I. 1984. Calceocrinids from the Early Silurian (Llandoverian) Brassfield Formation of southwestern Ohio. Journal of Paleontology 58: 1167-1185.
- ↑ Coogan, A.H. 1996. Ohio's surface rocks and sediments, in Feldmann, R.M., and Hackathorn, M., eds., Fossils of Ohio: Ohio Department of Natural Resources, Division of Geological Survey Bulletin 70: 31–50.
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- Silurian southern paleotemperate deposits
- Rhuddanian
- Aeronian
- Telychian
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