Chepultepec Formation | |
---|---|
Stratigraphic range: Early Ordovician | |
Type | Formation |
Unit of | Knox Group |
Underlies | Longview Limestone |
Overlies | Copper Ridge Dolomite, Conococheague Formation |
Location | |
Region | Alabama, Tennessee, and Virginia |
Country | United States |
Type section | |
Named for | Chepultepec, Alabama |
Named by | Ulrich, 1911 |
The Chepultepec Formation, is an Early Ordovician-age geological formation in the Appalachian regions of Eastern North America. Also known as the Chepultepec Dolomite, it is a unit of the Upper Knox Group, overlying the Copper Ridge Dolomite and underlying the Longview-Kingsport-Mascot sequence. The Chepultepec Formation is a primarily limestone and dolomite formation, the earliest formation of the Ordovician period in its area. Further north, it is equivalent to the Stonehenge Formation of the Beekmantown Group.[1] The formation was first described from Allgood, Alabama, and has also been found in Tennessee and Virginia. Allgood was originally named "Chepultepec", providing its name to the formation as well.[2] In Virginia, the Chepultepec Formation has a habit of forming large natural arches, including Natural Tunnel in Scott County and Natural Bridge in Rockbridge County.[3][4]
See also
References
- ↑ Read, J. Fred; Eriksson, Kenneth A. (2012). "Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau" (PDF). Virginia Tech Scholarly Works, Department of Geosciences.
- ↑ Unklesbay, A.G.; Young, Robert S. (May 1956). "Early Ordovician Nautiloids from Virginia". Journal of Paleontology. 30 (3): 481–491.
- ↑ Spencer, Edgar W. (May 1964). "Natural Bridge and vicinity" (PDF). Virginia Minerals. 10 (2): 1–6.
- ↑ Woodward, Edgar W. (1936). "Natural bridge and Natural Tunnel, Virginia". The Journal of Geology. 44 (5): 604–616.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.