NL39: Rhuddanian - Aeronian, United Kingdom
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Strophomenata
- Strophomenida
- Sowerbyellidae
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Eoplectodonta duplicata
(de Sowerby and Murchison 1839)
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2 specimens | |||||||||
| recombined as Eoplectodonta (Eoplectodonta) duplicata | ||||||||||
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Strophomenata
- Strophomenida
- Rafinesquinidae
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Leptaena haverfordensis
Bancroft 1949
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1 specimen | |||||||||
| recombined as Leptaena (Leptaena) haverfordensis | ||||||||||
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Rhynchonellata
- Pentamerida
- Clorindidae
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Clorinda undata
(de Sowerby and Murchison 1839)
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6 specimens | |||||||||
| recombined as Clorilamnulella undata | ||||||||||
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Rhynchonellata
- Orthida
- Hesperorthidae
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Dolerorthis sowerbyiana
(Davidson 1869)
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1 specimen | |||||||||
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Rhynchonellata
- Atrypida
- Lissatrypidae
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Meifodia prima
(Williams 1951)
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10 specimens | |||||||||
| ssp. prima | ||||||||||
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Rhynchonellata
- Atrypida
- Atrypinidae
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Plectatrypa tripartita
(de Sowerby and Murchison 1839)
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9 specimens | |||||||||
| recombined as Eospirigerina tripartita | ||||||||||
| ssp. nov. | ||||||||||
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Rhynchonellata
- Rhynchonellida
- Rhynchotrematidae
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Stegerhynchus pusillum
(de Sowerby and Murchison 1839)
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7 specimens | |||||||||
| see common names | ||||||||||
Geography
| Country: | United Kingdom | State/province: | Wales |
| Coordinates: | 52.1° North, 3.6° West (view map) | ||
| Paleocoordinates: | 35.6° South, 16.8° West | ||
| Basis of coordinate: | based on political unit | ||
| Geographic resolution: | small collection |
Time
| Period: | Silurian | Epoch: | Llandovery |
| 10 m.y. bin: | Silurian 1 | ||
| *Period: | Early/Lower Silurian | *Epoch: | Early/Lower Llandovery - Middle Llandovery |
| *International age/stage: | Late/Upper Rhuddanian - Late/Upper Aeronian | ||
| Key time interval: | Rhuddanian - Aeronian | ||
| Age range of interval: | 443.80000 - 438.50000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Trefawr | ||||
| Local section: | N. Llandovery h1 | Local bed: | NL39 | ||
| Local order: | no particular order | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Unless a conodont zone was explicitly stated, a Late Rhudd - Late Aeron age was entered because of the statement these beds are all "pre-sedgwickii Zone." Localities are referred to the measured transects f2, h1, i2, i3, j2, and l, of Cocks et al. 1984, p178, fig.3) | |||||
Lithology and environment
| Primary lithology: | lithified mudstone |
| Secondary lithology: | sandstone |
| Environment: | marine indet. |
Taphonomy
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | bulk,field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: "... a single collection (from bulk material) [was made] from each locality, identifying and recording all fossils encountered during break up of the rock... [sacrificing commoner taxa in continued searching, or preserving rarer specimens and not breaking the rock further]...figures obtained for relative frequencies of the taxa are prob accurate...estimates of volumetric abundance...are prob too low." Sample: 2.4 kg. | |
| Taxonomic list comments:"Brachiopods... form the overwhelming preponderance of early Llandovery shelly faunas in Wales." | |
Metadata
| Database number: | 4977 | ||
| Authorizer: | J. Alroy | Enterer: | M. Sommers |
| Modifier: | C. Visaggi | Research group: | marine invertebrate |
| Created: | 1999-08-26 16:44:00 | Last modified: | 2004-03-11 16:25:07 |
| Access level: | the public | Released: | 2000-11-20 13:53:24 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 196. | J. T. Temple. 1987. Early Llandovery brachiopods of Wales. Palaeontological Society Monographs 139(572):1-137 [J. Alroy/M. Sommers/M. Uhen] |