NGS5-27-86E, NGS5-25-86F, Walidiala Valley: Tommotian - Atdabanian, Guinea
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Coeloscleritophora
- Chancelloriida
- Chancelloriidae
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Chancelloria sp.
Walcott 1920
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Heteractinida
- Octactinellida
- Eiffeliidae
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Eiffelia sp.
Walcott 1920
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Ammodiscidae
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Turritellella sp.
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Glomospira sp.
Rzehak 1895
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Tolypammina sp.
Rhumbler 1895
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Hemisphaeramminidae
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Hemisphaerammina sp.
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Psammosphaeridae
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? Sorosphaera sp.
Brady 1879
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Geography
| Country: | Guinea |
| Coordinates: | 12.3° North, 12.4° West (view map) |
| Paleocoordinates: | 75.3° South, 148.6° East |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | local area |
Time
| Period: | Cambrian | Epoch: | Terreneuvian - Series 2 |
| Stage: | Stage 2 - Stage 3 | 10 m.y. bin: | Cambrian 2 |
| *Period: | Early/Lower Cambrian - Middle Cambrian | *Epoch: | Early/Lower Caerfai - Middle Caerfai | *Local age/stage: | Nemakit-Daldynian - Atdabanian |
| Key time interval: | Tommotian - Atdabanian | ||
| Age range of interval: | 525.5 - 515.6 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Nandoumari | Member: | Fougons |
| Stratigraphic resolution: | member |
Lithology and environment
| Primary lithology: | lithified siltstone |
| Lithology description: the fosils are from a sequence of undeformed and unmetamorphosed sedimentary rocks. the fossiliferous units are characterized by mm-cm thick, sharp erosionally based, flat-topped graded beds. no evidence of bioturbation and no hummocky cross-beds. the thinning/fining upwards from the bowal to fougon is interpretted as an increase of water depth/distance from the shoreline. the calcitic specimens are collected above the Bowal memeber (east side of walidiala valley) and from a purple sandstone 2m above the chert beds in the fougon member (west side of walidiala valley). | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body,replaced with calcite,replaced with silica,replaced with phosphate |
| Size of fossils: | microfossils |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | bulk,chemical,field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | USNM |
| Taxonomic list comments:Taxonomic list mentions the presence of echinoderm ossicles but does not go beyond this general description. | |
Metadata
| Database number: | 7790 | ||
| Authorizer: | M. Patzkowsky | Enterer: | P. Borkow |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2000-06-02 12:22:44 | Last modified: | 2020-04-28 00:23:04 |
| Access level: | the public | Released: | 2000-06-02 12:22:44 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 494. | S. J. Culver, J. E. Repetski, J. Pojeta, Jr. and D. Hunt. 1996. Early and Middle (?) Cambrian metazoan and protistan fossils from West Africa. Journal of Paleontology 70(1):1-6 [M. Patzkowsky/P. Borkow/J. Alroy] |