Gratton Limestone Formation, Tazewell County Farm: Caradoc, Virginia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Stromatoceruium rugosum
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| Hall (rare) | ||||||||||
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Cephalopoda
- Orthocerida
- Orthoceratidae
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Orthoceras sp.
Breynius 1832
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| (common) | ||||||||||
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Gastropoda
- Murchisoniina
- Loxonematidae
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Omospira cf. laticincta
Ulrich and Scofield 1897
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| Ulrich | ||||||||||
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Gastropoda
- Murchisoniina
- Eotomariidae
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Eotomaria sp.
Ulrich and Scofield 1897
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Gastropoda
- Murchisoniina
- Subulitidae
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Subulites sp.
Emmons 1842
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Ostracoda
- Hollinocopida
- Euprimitiidae
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Primitiella constricta
Ulrich 1894
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| Ulrich | ||||||||||
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Ostracoda
- Leperditicopida
- Isochilinidae
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Isochilina sp.
(Jones 1858)
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Ostracoda
- Palaeocopida
- Leperditellidae
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Leperditella sp.
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Stromatoporoidea
- Labechiida
- Aulaceratidae
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Cryptophragmus antiquatus
Raymond 1914
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| Raymond (very rare) | ||||||||||
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Stromatoporoidea
- Labechiida
- Stromatoceriidae
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Stromatocerium rugosum
Hall 1847
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| Hall (rare) | ||||||||||
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unclassified
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Tetradium cellulosum
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| (Hall) | ||||||||||
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Tetradium ? columnare
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| (Hall) | ||||||||||
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Tetradium racemosum
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| Raymond (common) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Virginia | County: | Tazewell |
| Coordinates: | 37.0° North, 81.0° West (view map) | ||||
| Paleocoordinates: | 30.0° South, 61.5° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | local area |
Time
| Period: | Ordovician | Epoch: | Late/Upper Ordovician |
| 10 m.y. bin: | Ordovician 4-5 | ||
| Key time interval: | Caradoc | ||
| Age range of interval: | 458.40000 - 449.60000 m.y. ago |
Stratigraphy
| Formation: | Gratton Limestone | ||||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: Ashbyan | |||||
Lithology and environment
| Primary lithology: | desiccation cracks cherty/siliceous "limestone" |
| Includes fossils? | Y |
| Lithology description: Thick-bedded dove-gray calcilutytes; weathered surfaces of the third calcilutyte are light gray to creamy white. This zone locally contains intercalations of dark-gray cherty limestone. | |
| Environment: | carbonate indet. |
Taphonomy
| Size of fossils: | macrofossils,microfossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 34218 | ||
| Authorizer: | S. Holland | Enterer: | T. Hanson |
| Modifier: | S. Holland | Research group: | marine invertebrate |
| Created: | 2003-08-21 22:43:07 | Last modified: | 2024-03-31 19:20:47 |
| Access level: | the public | Released: | 2003-08-21 22:43:07 |
| 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] |