East of Wenallt #2: Hirnantian, United Kingdom
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Bryozoa indet.
Ehrenberg 1831
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14 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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16 specimens | |||||||||
| cryptostome | ||||||||||
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Stenolaemata
- Cryptostomata
- Ptilodictyidae
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Ptilodictya sp.
Lonsdale 1839
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6 specimens | |||||||||
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Stenolaemata
- Cryptostomata
- Acanthocladiidae
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Penniretepora sp.
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1 specimen | |||||||||
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unclassified
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Hyolitha indet.
Marek 1963
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2 specimens | |||||||||
| hyolith | ||||||||||
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Brachiopoda indet.
Cuvier 1805
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1 specimen | |||||||||
| spire bearer | ||||||||||
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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
- Rafinesquinidae
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Leptaena sp.
Dalman 1828
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1 specimen | |||||||||
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Strophomenata
- Strophomenida
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Strophomenacea indet.
King 1846
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1 specimen | |||||||||
| strophomenacean | ||||||||||
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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
- Strophomenida
- Strophomenidae
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? Holtedahlina sp.
Foerste 1924
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1 specimen | |||||||||
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Strophomenata
- Orthotetida
- Triplesiidae
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Triplesiidae indet.
Schuchert 1913
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1 specimen | |||||||||
| triplesiid | ||||||||||
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Rhynchonellata
- Protorthida
- Skenidiidae
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Skenidioides sp.
Schuchert and Cooper 1931
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1 specimen | |||||||||
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Rhynchonellata
- Orthida
- Dalmanellidae
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Dalmanellidae indet.
Schuchert 1913
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5 specimens | |||||||||
| dalmanellid | ||||||||||
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Dalmanella sp.
Hall and Clarke 1892
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3 specimens | |||||||||
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Dalmanella cf. sculpta
Cooper 1956
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1 specimen | |||||||||
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Rhynchonellata
- Orthida
- Draboviidae
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Hirnantia sagittifera
(McCoy 1851)
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1 specimen | |||||||||
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Rhynchonellata
- Orthida
- Platystrophiidae
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? Salacorthis sp.
Williams 1974
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1 specimen | |||||||||
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Rhynchonellata
- Orthida
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Orthacea indet.
Woodward and Schuchert 1852
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2 specimens | |||||||||
| orthacean | ||||||||||
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Rhynchonellata
- Orthida
- Glyptorthidae
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Glyptorthis sp.
Foerste 1914
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5 specimens | |||||||||
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Rhynchonellata
- Athyridida
- Meristellidae
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Hindella incipiens
(Williams 1951)
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4 specimens | |||||||||
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Tentaculitida
- Cornulitidae
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Cornulites sp.
Schlotheim 1820
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3 specimens | |||||||||
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Bivalvia
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Bivalvia indet.
Linnaeus 1758
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1 specimen | |||||||||
| mytiliform | ||||||||||
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unclassified
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Hexactinellidae indet.
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1 specimen | |||||||||
| hexactinellid | ||||||||||
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Trilobita
- Phacopida
- Dalmanitidae
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Mucronaspis sp.
Destombes 1963
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1 specimen | |||||||||
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Mucronaspis cf. olini
(Temple 1952)
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1 specimen | |||||||||
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Ostracoda
- Palaeocopida
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Palaeocopida indet.
Henningsmoen 1953
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3 specimens | |||||||||
| 1x palaeocope, 2x reticulate palaeocope | ||||||||||
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unclassified
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Echinodermata indet.
Klein 1754
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6 elements | |||||||||
| quadrate ossicles | ||||||||||
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Pelmatozoa indet.
Leuckart 1848
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34 elements | |||||||||
| ossicles | ||||||||||
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Cystoidea
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Cystoidea indet.
von Buch 1846
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1 element | |||||||||
| plate | ||||||||||
| 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: | 8385 | ||
| Authorizer: | J. Alroy | Enterer: | M. Sommers | Research group: | marine invertebrate |
| Created: | 2000-07-10 15:40:30 | Last modified: | 2000-07-10 18:40:30 |
| 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] |