East of Wenallt: Hirnantian, United Kingdom
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Anthozoa
- Rugosa
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Rugosa indet.
Milne-Edwards and Haime 1850
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1 specimen | |||||||||
| solitary rugose coral | ||||||||||
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unclassified
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Bryozoa indet.
Ehrenberg 1831
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2 specimens | |||||||||
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Stenolaemata
- Trepostomata
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Trepostomata indet.
Ulrich 1882
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3 specimens | |||||||||
| trepostome | ||||||||||
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Stenolaemata
- Cryptostomata
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Cryptostomata indet.
Vine 1884
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17 specimens | |||||||||
| cryptostome | ||||||||||
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Stenolaemata
- Cryptostomata
- Escharoporidae
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Escharopora sp.
Hall 1847
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4 specimens | |||||||||
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unclassified
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Hyolitha indet.
Marek 1963
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1 specimen | |||||||||
| hyolith | ||||||||||
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Craniata
- Craniopsida
- Craniopsidae
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Paracraniops sp.
Williams 1963
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3 specimens | |||||||||
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Strophomenata
- Strophomenida
- Leptellinidae
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Leptellinidae indet.
Ulrich and Cooper 1936
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1 specimen | |||||||||
| leptellinid | ||||||||||
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Strophomenata
- Strophomenida
- Sowerbyellidae
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Sowerbyellidae indet.
Opik 1930
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1 specimen | |||||||||
| sowerbyellid | ||||||||||
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Strophomenata
- Strophomenida
- Leptestiidae
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? Sampo sp.
Opik 1933
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Strophomenata
- Strophomenida
- Rafinesquinidae
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Leptaena sp.
Dalman 1828
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3 specimens | |||||||||
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Strophomenata
- Strophomenida
- Leptostrophiidae
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Eostropheodonta hirnantensis
(M'Coy 1851)
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2 specimens | |||||||||
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Strophomenata
- Orthotetida
- Triplesiidae
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Triplesia sp.
Hall 1859
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1 specimen | |||||||||
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Rhynchonellata
- Protorthida
- Skenidiidae
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? Skenidioides sp.
Schuchert and Cooper 1931
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Rhynchonellata
- Atrypida
- Atrypidae
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Atrypidae indet.
Gill 1871
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1 specimen | |||||||||
| costate atrypid | ||||||||||
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Rhynchonellata
- Orthida
- Dalmanellidae
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Dalmanellidae indet.
Schuchert 1913
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3 specimens | |||||||||
| dalmanellid | ||||||||||
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Dalmanella testudinaria
(Dalman 1828)
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1 specimen | |||||||||
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Rhynchonellata
- Orthida
- Draboviidae
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? Hirnantia sp.
Lamont 1935
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1 specimen | |||||||||
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Hirnantia sagittifera
(McCoy 1851)
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1 specimen | |||||||||
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Rhynchonellata
- Orthida
- Plectorthidae
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Plectorthis sp.
Hall and Clarke 1892
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1 specimen | |||||||||
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Rhynchonellata
- Orthida
- Hesperorthidae
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Dolerorthis sp.
Schuchert and Cooper 1931
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1 specimen | |||||||||
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Rhynchonellata
- Orthida
- Glyptorthidae
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Glyptorthis sp.
Foerste 1914
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1 specimen | |||||||||
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Rhynchonellata
- Athyridida
- Meristellidae
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? Hindella sp.
Davidson 1882
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1 specimen | |||||||||
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Trilobita
- Phacopida
- Dalmanitidae
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? Dalmanitidae indet.
Vogdes 1890
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1 specimen | |||||||||
| dalmanitid | ||||||||||
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Ostracoda
- Palaeocopida
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Palaeocopida indet.
Henningsmoen 1953
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1 specimen | |||||||||
| reticulate palaeocope | ||||||||||
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unclassified
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Echinodermata indet.
Klein 1754
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4 elements | |||||||||
| quadrate ossicles | ||||||||||
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Pelmatozoa indet.
Leuckart 1848
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14 elements | |||||||||
| pelmatozoan ossicles | ||||||||||
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Crinoidea
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Crinoidea indet.
Miller 1821
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3 elements | |||||||||
| ossicles | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United Kingdom | State/province: | Wales |
| Coordinates: | 51.8° North, 3.6° West (view map) | ||
| Paleocoordinates: | 39.1° South, 17.0° West | ||
| Geographic resolution: | small collection |
Time
| Period: | Ordovician | Epoch: | Late Ordovician |
| Stage: | Hirnantian | 10 m.y. bin: | Ordovician 5 |
| *Period: | Late/Upper Ordovician | *Epoch: | Ashgill |
| Key time interval: | Hirnantian | ||
| Age range of interval: | 445.2 - 443.8 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Lithology and environment
| Primary lithology: | ooidal,shelly/skeletal lithified argillaceous,sandy siltstone |
| Secondary lithology: | sandstone |
| Lithology description: sandy and muddy siltstones with ooids alternating with fine to very fine speckly sandstones. abundant fragmentary pelmatozoan and bryozoan material. | |
| Environment: | offshore |
Taphonomy
| Modes of preservation: | body |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 8383 | ||
| Authorizer: | J. Alroy | Enterer: | M. Sommers | Research group: | marine invertebrate |
| Created: | 2000-07-10 14:50:35 | Last modified: | 2000-07-10 17:50:35 |
| Access level: | the public | Released: | 2000-11-20 13:53:37 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 571. | A. Williams and A. D. Wright. 1981. The Ordovician-Silurian boundary in the Garth area of southwest Powys, Wales. Geological Journal 16:1-39 [J. Alroy/M. Sommers/P. Wagner] |