Cliffield Formation, Blackford Member, Pisgah Church: Llanvirn, Virginia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Rhynchonellata
- Orthida
- Plaesiomyidae
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Dinorthis sp.
Hall and Clarke 1892
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Dinorthis cf. atavoides
Willard 1928
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| Willard | ||||||||||
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Rhynchonellata
- Orthida
- Plectorthidae
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Plectorthis sp.
Hall and Clarke 1892
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Gastropoda
- Euomphalina
- Helicotomidae
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Ophiletina sp.
Ulrich and Scofield 1897
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Helicotoma sp.
Salter 1859
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Trilobita
- Phacopida
- Pterygometopidae
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Calliops sp.
Delo 1935
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Ostracoda
- Palaeocopida
- Leperditellidae
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Leperditella sp.
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Ostracoda
- Leperditicopida
- Leperditiidae
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Leperditia fabulites
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Virginia | County: | Tazewell |
| Coordinates: | 37.1° North, 81.3° West (view map) | ||||
| Paleocoordinates: | 30.6° South, 67.3° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician | Epoch: | Middle Ordovician |
| 10 m.y. bin: | Ordovician 2-3 | ||
| Key time interval: | Llanvirn | ||
| Age range of interval: | 468.4 - 458.4 m.y. ago |
Stratigraphy
Lithology and environment
| Primary lithology: | black,gray chert |
| Secondary lithology: | gray "limestone" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: dark-gray to black chert interbedded with subordinate light-gray fine-grained limestone; in weathered expoosures, limestones have been dissolved; chert weathers white and breaks into rectangular blocks; average thickness is 30 feet. | |
| Environment: | carbonate indet. |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 33447 | ||
| Authorizer: | S. Holland | Enterer: | T. Hanson |
| Modifier: | S. Holland | Research group: | marine invertebrate |
| Created: | 2003-07-30 21:05:01 | Last modified: | 2024-03-31 19:20:44 |
| Access level: | the public | Released: | 2003-07-30 21:05:01 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 8880. | B. N. Cooper and C. E. Prouty. 1943. Stratigraphy of the Lower Middle Ordovician of Tazewell County, Virginia. Bulletin of the Geological Society of America 54:819-886 [S. Holland/T. Hanson/T. Hanson] |