| Shady Dolomite | |
|---|---|
| Stratigraphic range: Cambrian Series 2 | |
| Type | Geological formation |
| Sub-units | Austinville, Patterson, and Ivanhoe Members |
| Underlies | Rome Formation, Elbrook Formation |
| Overlies | Weisner Quartzite, Chilhowee Group |
| Lithology | |
| Primary | Dolomite |
| Other | Limestone and Shale |
| Location | |
| Region | Appalachia and Southeastern United States |
| Type section | |
| Named for | Shady Valley, Tennessee, USA |
| Named by | Arthur Keith - 1903 |
| Country |  United States |
The Shady Dolomite is a geologic formation composed of marine sedimentary rocks of early Cambrian age (Cambrian Series 2: 521-509 million years ago). It outcrops along the eastern margin of the Blue Ridge province in the southeastern United States and can be found in outcrops in the states of Alabama, Georgia, Tennessee, North Carolina, and Virginia. It can also be found in the subsurface of Kentucky, Ohio, and West Virginia. The Shady is predominantly composed of dolomite and limestone with lesser amounts of mudrock. It contains fossils of trilobites, archaeocyathids, algae, brachiopods, and echinoderms, along with the enigmatic fossil Salterella.[1][2][3][4][5][6] The Shady Dolomite was first described by Arthur Keith in 1903[7] and was named for exposures in the Shady Valley of Johnson County in the state of Tennessee. Near Austinville, Virginia, the Shady hosts ore deposits that have been mined extensively for lead and zinc ore.[8]
- ^ McMenamin, Mark A.S.; Debrenne, Françoise; Zhuravlev, Andrey Yu. (2000). "Early Cambrian Appalachian Archaeocyaths: Further age constraints from the fauna of New Jersey and Virginia, U.S.A." Geobios. 33 (6): 693–708. doi:10.1016/S0016-6995(00)80123-0.
- ^ Fritz, W. H.; Yochelson, Ellis L. (1988-03-01). "The status of Salterella as a Lower Cambrian index fossil". Canadian Journal of Earth Sciences. 25 (3): 403–416. Bibcode:1988CaJES..25..403F. doi:10.1139/e88-042. ISSN 0008-4077.
- ^ Kobluk, David R. (1985). "Biota Preserved within Cavities in Cambrian Epiphyton Mounds, Upper Shady Dolomite, Southwestern Virginia". Journal of Paleontology. 59 (5): 1158–1172. ISSN 0022-3360. JSTOR 1305009.
- ^ J. F. Read, R. W. Pfeil (2) (1983). "Fabrics of Allochthonous Reefal Blocks, Shady Dolomite (Lower to Middle Cambrian), Virginia Appalachians". SEPM Journal of Sedimentary Research. 53. doi:10.1306/212F82B5-2B24-11D7-8648000102C1865D. ISSN 1527-1404.
{{cite journal}}: CS1 maint: numeric names: authors list (link) - ^ Byrd, W J; Weinberg, E L; Yochelson, Ellis L (1973). "Salterella in the Lower Cambrian Shady Dolomite of southwestern Virginia" (PDF). American Journal of Science. 273A: 252–260.
- ^ Willoughby, Ralph (1977). Paleontology and stratigraphy of the Shady Formation near Austinville. Virginia Polytechnic Institute and State University, Blacks- burg, Virginia. p. 189.
{{cite book}}:|work=ignored (help) - ^ Keith, Arthur, (1903) Description of the Cranberry quadrangle [North Carolina-Tennessee]: U. S. Geological Survey Geology Atlas, Folio 90.
- ^ "Division of Geology and Mineral Resources - The New Jersey Zinc Company". dmme.virginia.gov. Retrieved 2020-05-09.