Chepultepec Formation
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]
| 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 |
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.