35S, Narrows, Martinsburg Fm., Giles Co., VA: Caradoc, Virginia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Craniata
- Craniopsida
- Craniopsidae
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Craniops sp.
Hall 1859
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2 %-specimens | ||||||
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Rhynchonellata
- Orthida
- Dalmanellidae
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Onniella sp.
Bancroft 1928
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3 %-specimens | ||||||
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Rhynchonellata
- Atrypida
- Anazygidae
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Zygospira sp.
Hall 1862
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3 %-specimens | ||||||
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Cephalopoda
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Nautiloidea indet.
Agassiz 1847
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13 %-specimens | ||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | Virginia | County: | Giles |
| Coordinates: | 37.4° North, 80.8° West (view map) | ||||
| Paleocoordinates: | 29.8° South, 61.1° West | ||||
| Basis of coordinate: | unpublished field data | ||||
| 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: | Narrows | Local bed: | 324 (Narrows unit 37) m | ||
| Local order: | top to bottom | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Total unit thickness = 15.67 m
Time interval = Trentonian-Maysvillian | |||||
Lithology and environment
| Primary lithology: | planar lamination,shelly/skeletal,gray packstone | ||
| Secondary lithology: | "shale" | ||
| Includes fossils? | Y | ||
| Lithology description: limestone (60%) and shale (40%); limestone is skeletal packstone (20%) and subequal amounts of calcisiltite and calcarenite ( totalling 40%), medium light gray, very thin and thin bedded, plane laminated but soem calcisiltite is massive, some nodular bedded | |||
| Environment: | deep subtidal indet. | Tectonic setting: | foreland basin |
| Geology comments: within author'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: | biostratigraphic analysis |
Metadata
| Database number: | 50645 | ||
| Authorizer: | S. Holland | Enterer: | K. Layou |
| Modifier: | K. Layou | Research group: | marine invertebrate |
| Created: | 2005-05-18 13:16:30 | Last modified: | 2005-05-19 11:26:53 |
| Access level: | the public | Released: | 2005-05-18 13:16:30 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 13546. | R. D. Kreisa. 1980. Virginia Polytechnic Institute and State University. 1-355 [S. Holland/K. Layou/K. Layou] |