Middle Allt Ddu trilobites: Soudleyan, United Kingdom
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Trilobita
- Phacopida
- Homalonotidae
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Brongniartella minor
(Salter 1852)
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Trilobita
- Trinucleida
- Trinucleidae
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Broeggerolithus broeggeri
(Bancroft 1929)
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unclassified
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informal isotelinid indet.
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Strophomenata
- Strophomenida
- Sowerbyellidae
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Sowerbyella sericea
(Sowerby 1839)
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Bassett et al. 1966 | |||||||||
| subspecies permixta | ||||||||||
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Strophomenata
- Strophomenida
- Rafinesquinidae
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Macrocoelia prolata
Williams 1963
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Bassett et al. 1966 | |||||||||
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Rhynchonellata
- Orthida
- Dalmanellidae
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Howellites intermedia
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Bassett et al. 1966 | |||||||||
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Howellites striata
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Bassett et al. 1966 | |||||||||
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Rhynchonellata
- Orthida
- Harknessellidae
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Reuschella cf. horderleyensis
Bancroft 1929
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Bassett et al. 1966 | |||||||||
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Rhynchonellata
- Rhynchonellida
- Trigonirhynchiidae
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Rostricellula sparsa
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Bassett et al. 1966 | |||||||||
| see common names | ||||||||||
Geography
| Country: | United Kingdom | State/province: | Wales |
| Coordinates: | 52.9° North, 3.6° West (view map) | ||
| Paleocoordinates: | 52.2° South, 18.4° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | local area |
Time
| Period: | Ordovician | Epoch: | Late Ordovician |
| Stage: | Sandbian | 10 m.y. bin: | Ordovician 4 |
| Key time interval: | Soudleyan | Graptolite zone: | Diplograptus multidens |
| Age range of interval: | 458.4 - 457.4 m.y. ago |
Stratigraphy
| Geological group: | Lower Bala | Formation: | Allt Ddu | ||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: middle assemblage zone | |||||
Lithology and environment
| Primary lithology: | bioturbation,blue lithified silty mudstone |
| Secondary lithology: | current ripples,fine lithified siltstone |
| Includes fossils? | Y |
| Lithology description: Allt Ddu: monotonous series of dark blue silty mudstones with fine siltstones commonly disposed in small-scale cross- and ripple- lamination...greatly disturbed by burrowing organisms and bedding is poorly developed except in the coarser beds [Bassett et al 1996] | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body,mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection,survey of museum collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | BMNH |
Metadata
| Database number: | 188596 | ||
| Authorizer: | M. Hopkins | Enterer: | M. Hopkins |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2017-09-08 17:39:38 | Last modified: | 2018-04-10 19:48:29 |
| Access level: | the public | Released: | 2017-09-08 17:39:38 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 63267. | H. B. Whittington. 1968. The Ordovician trilobites of the Bala Area, Merioneth. Part IV. Monograph of the Palaeontographical Society 122(520):93-138 [M. Hopkins/M. Hopkins] |
Secondary references:
| 171 | D. A. Bassett, H. B. Whittington, and A. Williams. 1966. The Stratigraphy of the Bala District, Merionethshire. Quarterly Journal of the Geological Society of London 122(3):219-269 [A. Miller/P. Novack-Gottshall/P. Wagner] |