Walker Mountain 140 (WK140): Caradoc, Virginia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata
- Orthida
- Dalmanellidae
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Dalmanella fertilis
Ulrich 1909
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Springer 1982 | 5 individuals | ||||||||
Strophomenata
- Strophomenida
- Rafinesquinidae
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Rafinesquina alternata
(Conrad 1838)
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Springer 1982 | 42 individuals | ||||||||
Strophomenata
- Strophomenida
- Sowerbyellidae
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Sowerbyella curdsvillensis
(Foerste 1912)
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Springer 1982 | 52 individuals | ||||||||
Stenolaemata
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Stenolaemata informal indet. B
Borg 1926
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Springer 1982 | 1 individual | ||||||||
large ramose bryozoans | ||||||||||
Trilobita
- Asaphida
- Asaphidae
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Isotelus sp.
Dekay 1824
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Springer 1982 | 25 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: | 85637 | ||
Authorizer: | K. Layou | Enterer: | K. Layou |
Modifier: | K. Layou | Research group: | marine invertebrate |
Created: | 2009-01-13 08:32:50 | Last modified: | 2009-01-14 19:24:26 |
Access level: | the public | Released: | 2009-01-13 08:32:50 |
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] |