East of Wenallt #4: Hirnantian, United Kingdom
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Crinoidea
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Crinoidea indet.
Miller 1821
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7 elements | |||||||||
| crinoid ossicles | ||||||||||
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unclassified
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Pelmatozoa indet.
Leuckart 1848
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35 elements | |||||||||
| pelmatozoan ossicles | ||||||||||
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Tentaculita
- Cornulitida
- Cornulitidae
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Cornulites sp.
Schlotheim 1820
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1 specimen | |||||||||
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unclassified
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Brachiopoda indet.
Cuvier 1805
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1 specimen | |||||||||
| spire bearer indet. | ||||||||||
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Inarticulata
- Inarticulata
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Inarticulata indet.
Huxley 1869
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1 specimen | |||||||||
| invalid subgroup of Brachiopoda | ||||||||||
| inarticulate | ||||||||||
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Craniata
- Craniopsida
- Craniopsidae
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Paracraniops sp.
Williams 1963
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5 specimens | |||||||||
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Rhynchonellata
- Atrypida
- Anazygidae
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Zygospira sp.
Hall 1862
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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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Hindella incipiens
(Williams 1951)
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3 specimens | |||||||||
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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
- Orthida
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Orthacea indet.
Woodward and Schuchert 1852
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2 specimens | |||||||||
| replaced by Orthoidea | ||||||||||
| orthacean | ||||||||||
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Rhynchonellata
- Orthida
- Hesperorthidae
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Dolerorthis sp.
Schuchert and Cooper 1931
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Rhynchonellata
- Orthida
- Platystrophiidae
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Platystrophia sp.
King 1850
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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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2 specimens | |||||||||
| dalmanellid | ||||||||||
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Isorthis sp.
Kozlowski 1929
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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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3 specimens | |||||||||
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Kinnella sp.
Bergström 1968
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1 specimen | |||||||||
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Kinnella kielanae
(Temple 1965)
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1 specimen | |||||||||
| synonym of Kinnella medlicotti | ||||||||||
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Rhynchonellata
- Protorthida
- Skenidiidae
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Skenidioides sp.
Schuchert and Cooper 1931
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2 specimens | |||||||||
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Strophomenata
- Strophomenida
- Leptostrophiidae
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? Eostropheodonta sp.
Bancroft 1949
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2 specimens | |||||||||
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Eostropheodonta hirnantensis
(M'Coy 1851)
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2 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
- Leptestiidae
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Sampo ruralis
(Reed 1917)
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1 specimen | |||||||||
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Strophomenata
- Strophomenida
- Sowerbyellidae
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Eoplectodonta sp.
Kozlowski 1929
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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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2 specimens | |||||||||
| triplesiid | ||||||||||
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? Cliftonia sp.
Foerste 1909
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unclassified
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Hyolitha indet.
Marek 1963
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1 specimen | |||||||||
| hyolith | ||||||||||
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Orthothecida
- Orthothecidae
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Bactrotheca sp.
Novak 1891
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2 specimens | |||||||||
| including 1x ? Bactrotheca | ||||||||||
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unclassified
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Bryozoa indet.
Ehrenberg 1831
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7 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
- Cyclostomata
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Cyclostomata indet.
Busk 1852
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1 specimen | |||||||||
| cyclostome | ||||||||||
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Stenolaemata
- Cryptostomata
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Cryptostomata indet.
Vine 1884
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13 specimens | |||||||||
| cryptostome | ||||||||||
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Stenolaemata
- Cryptostomata
- Rhinidictyidae
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Pachydictya sp.
Ulrich 1882
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2 specimens | |||||||||
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Stenolaemata
- Cryptostomata
- Ptilodictyidae
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Ptilodictya sp.
Lonsdale 1839
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3 specimens | |||||||||
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Trilobita
- Odontopleurida
- Odontopleuridae
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Leonaspis sp.
Richter and Richter 1917
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Leonaspis marklini
(Angelin 1854)
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1 specimen | |||||||||
| recombined as Exallaspis marklini | ||||||||||
| ssp. varbolensis | ||||||||||
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Trilobita
- Phacopida
- Calymenidae
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Calymenidae indet.
Milne-Edwards 1840
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1 specimen | |||||||||
| calymenid | ||||||||||
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Trilobita
- Phacopida
- Dalmanitidae
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Dalmanitidae indet.
Vogdes 1890
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1 specimen | |||||||||
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Ostracoda
- Palaeocopida
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Palaeocopida indet.
Henningsmoen 1953
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6 specimens | |||||||||
| 5x palaeocope, 1x reticulate palaeocope | ||||||||||
| 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/Upper Ordovician |
| Stage: | Hirnantian | 10 m.y. bin: | Ordovician 5 |
| *Period: | Late/Upper Ordovician | *Epoch: | Ashgill |
| Key time interval: | Hirnantian | ||
| Age range of interval: | 445.20000 - 443.80000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Wenallt | Member: | Speckly Sandstone |
| Stratigraphic resolution: | member |
Lithology and environment
| Primary lithology: | "cross stratification",deformed bedding,burrows,pebbly,brown,gray,blue lithified calcareous sandstone |
| Lithology description: blue-grey, finely crossbedded and evenly laminar calcareous sandstones weathering with chocolate brown tinges. mud flasers; burrows; pebbles rarely occur. | |
| Environment: | offshore |
Taphonomy
| Modes of preservation: | body |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 8392 | ||
| Authorizer: | J. Alroy | Enterer: | M. Sommers |
| Modifier: | E. Leckey | Research group: | marine invertebrate |
| Created: | 2000-07-10 16:04:13 | Last modified: | 2003-07-10 18:42:06 |
| Access level: | the public | Released: | 2000-07-10 16:04:13 |
| 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] |