Walker Mountain 260.2 (WK260): Caradoc, Virginia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Trilobita
- Asaphida
- Asaphidae
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Isotelus sp.
Dekay 1824
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Springer 1982 | 11 individuals | ||||||||
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Rhynchonellata
- Orthida
- Dalmanellidae
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Dalmanella fertilis
Ulrich 1909
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Springer 1982 | 1 individual | ||||||||
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Strophomenata
- Strophomenida
- Rafinesquinidae
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Rafinesquina alternata
(Conrad 1838)
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Springer 1982 | 16 individuals | ||||||||
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Stenolaemata
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Stenolaemata informal indet. A
Borg 1926
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Springer 1982 | 2 individuals | ||||||||
| small ramose bryozoans | ||||||||||
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Stenolaemata
- Trepostomida
- Monticuliporidae
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Prasopora sp.
Nicholson and Etheridge 1877
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Springer 1982 | 97 individuals | ||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Virginia | County: | Smyth |
| Coordinates: | 36.9° North, 81.5° West (view map) | ||||
| Paleocoordinates: | 29.8° South, 61.9° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
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: | Martinsburg | ||||
| Local section: | Walker Mountain | Local bed: | Martinsburg unit 17 | ||
| Local order: | top to bottom | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Total unit thickness = 62.50 m
Time interval = Trentonian-Maysvillian Stratigraphic and geologic descriptions based on Kreisa (1980) | |||||
Lithology and environment
| Primary lithology: | lithified "shale" | ||
| Secondary lithology: | shelly/skeletal lithified packstone | ||
| Lithology description: shale (55%) and limestone (45%); shale varying from 60% at base of unit to 50% at to; limestone is skeletal packstone (15%) and calcisiltite and minor calcarenite (total 30%) with abundant terrigenous silt (few beds of siltstone); very thin to medium bedded, packstone-laminated bed couplets common, plane laminated and CWRL, but many calcisiltites are massive | |||
| Environment: | transition zone/lower shoreface | Tectonic setting: | foreland basin |
| Geology comments: Stratigraphic and geologic descriptions based on Kreisa (1980); within Kreisa's mixed clastic-carbonate platform facies | |||
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | bulk,field collection |
| Reason for describing collection: | paleoecologic analysis |
Metadata
| Database number: | 85645 | ||
| Authorizer: | K. Layou | Enterer: | K. Layou |
| Modifier: | K. Layou | Research group: | marine invertebrate |
| Created: | 2009-01-13 08:36:08 | Last modified: | 2009-01-14 19:27:52 |
| Access level: | the public | Released: | 2009-01-13 08:36:08 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 28962. | K. M. Layou. 2009. Ecological restructuring after extinction: the Late Ordovician (Mohawkian) of the eastern United States. Palaios 24:118-128 [K. Layou/K. Layou] |
Secondary references:
| 28955 | D. A. Springer. 1982. Community gradients in the Martinsburg Fm. (Ord.) southwestern Virginia. Unpublished, Ph.D thesis, United Press International, Blacksburg VA [K. Layou/K. Layou/J. Ju] |