North Wales Rawtheyan Assemblage 4D, Rhwlas Limestone: Rawtheyan, United Kingdom

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Agnostida - Metagnostidae
Arthrorhachis sp. Hawle and Corda 1847
Trinodus sp. M'Coy 1846
    = Trinodus tardus Barrande 1846
Whittington 1968
Trilobita - Proetida - Proetidae
? Astroproetus berwynensis Whittington 1966
Whittington 1968
Trilobita - Proetida - Otarionidae
Otarion sp. Zenker 1833
Trilobita - Corynexochida - Illaenidae
Illaenus sp. Dalman 1827
originally entered as "Illaenus" sp."
Parillaenus sp. Jaanusson 1954
Trilobita - Corynexochida - Styginidae
Bronteopsis sp. Nicholson and Etheridge 1879
Stygina sp. Salter 1853
Phillipsinella sp. Novak 1885
    = Phillipsinella parabola Stormer 1953
Whittington 1968
Trilobita - Harpetida - Harpetidae
Harpes sp. Goldfuss 1839
originally entered as "Harpes" sp."
Trilobita - Trinucleida - Raphiophoridae
Raphiophorus sp. Angelin 1854
Lonchodomas sp. Angelin 1854
    = Lonchodomas tumidus Forbes 1849
Whittington 1968
Trilobita - Trinucleida - Trinucleidae
Tretaspis sp. M'Coy 1849
    = Tretaspis kiaeri Stormer 1930
Whittington 1968
Nankinolithus sp. Lu 1957
Trilobita - Asaphida - Remopleurididae
Remopleurides sp. Portlock 1843
    = Remopleurides cf. colbii Portlock 1843
Whittington 1968
Amphitryon sp. Hawle and Corda 1874
    = Amphitryon radians Barrande 1846
Whittington 1968
Trilobita - Asaphida - Asaphidae
Opsimasaphus radiates
Whittington 1968
Trilobita - Asaphida - Cyclopygidae
Cyclopyge cf. marginata
Whittington 1968
Trilobita - Odontopleurida - Odontopleuridae
Whittingtonia sp. Prantl and Pribyl 1949
    = Whittingtonia whittintoni
Whittington 1968
Diacanthaspis sp. Whittington 1941
    = Diacanthaspis decacantha Angelin 1854
Whittington 1968
Trilobita - Lichida - Lichidae
Platylichas sp. (Gürich 1901)
    = Platylichas glenos Whittington 1962
Whittington 1968
Trilobita - Phacopida - Dalmanitidae
Duftonia sp. Dean 1959
Trilobita - Phacopida - Pterygometopidae
Calyptaulax sp. Cooper 1930
    = Calyptaulax cf. norvegicus Stormer 1945
Whittington 1968
[Calyptaulax cf. marginata]
Trilobita - Phacopida - Calymenidae
Pharostoma sp. Hawle and Corda 1847
    = Pharostoma cf. obtusum McCoy 1846
Whittington 1968
Trilobita - Phacopida - Cheiruridae
Ceraurinella sp. Cooper 1953
    = Ceraurinella intermedia Kielan 1955
Whittington 1968
Pseudosphaerexochus sp. (Schmidt 1881)
    = Pseudosphaerexochus octolobatus M'Coy 1849
Whittington 1968
Sphaerocoryphe sp. Angelin 1854
Trilobita - Phacopida - Encrinuridae
Encrinuroides sp. Reed 1931
    = Encrinuroides sexcostatus Salter in Phillips and Salter 1848
Whittington 1968
Dindymene sp. Hawle and Corda 1847
    = Dindymene ornata Linnarsson 1869
Whittington 1968
Staurocephalus sp. Barrande 1846
    = Staurocephalus clavifrons Angelin 1878
Whittington 1968
Oedicybele sp. Whittington 1938
    = Oedicybele kingi Whittington 1938
Whittington 1968
Cybeloides sp. Slocum 1913
    = Cybeloides (Paracybeloides) girvanensis Reed 1906
Whittington 1968
Strophomenata - Strophomenida - Aegiromenidae
? Aegiria sp. Opik 1933
originally entered as "Aegiria? sp."
Strophomenata - Strophomenida - Christianiidae
Christiania sp. Hall and Clarke 1892
Strophomenata - Strophomenida - Leptestiidae
Leangella sp. Opik 1933
Sampo sp. Opik 1933
Strophomenata - Strophomenida - Sowerbyellidae
Anisopleurella sp. Cooper 1956
Sowerbyella sp. Jones 1928
Rhynchonellata - Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
Rhynchonellata - Orthida - Hesperorthidae
Ptychopleurella sp. Schuchert and Cooper 1931
Dolerorthis sp. Schuchert and Cooper 1931
Rhynchonellata - Orthida - Glyptorthidae
Glyptorthis sp. Foerste 1914
Rhynchonellata - Orthida - Orthidae
Orthambonites sp. Pander 1830
Rhynchonellata - Orthida - Productorthidae
Nicolella sp. Reed 1917
Rhynchonellata - Orthida - Rhactorthidae
Rhactorthis sp. Williams 1963
Rhynchonellata - Orthida - Plectorthidae
Schizophorella sp. Reed 1917
Rhynchonellata - Orthida - Dalmanellidae
Dalmanella sp. Hall and Clarke 1892
Howellites sp. (Bancroft 1945)
Rhynchonellata - Orthida - Dicoelosiidae
Dicoelosia sp. King 1850
see common names

Geography
Country:United Kingdom State/province:Wales
Coordinates: 53.0° North, 3.0° West (view map)
Paleocoordinates:45.7° South, 16.9° West
Geographic resolution:local area
Time
Period: Ordovician Epoch: Late Ordovician
Stage: Katian 10 m.y. bin: Ordovician 5
*Period:Late/Upper Ordovician *Epoch:Middle Ashgill
*International age/stage:Rawtheyan *Local age/stage:Rawtheyan
Key time interval: Rawtheyan
Age range of interval: 448.9 - 445.2 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Rhiwlas Limestone
Stratigraphic resolution:formation
Stratigraphy comments: Base of Moelfryn Mudstone, in Upper Bala Group
Lithology and environment
Primary lithology:gray lithified argillaceous "limestone"
Environment:offshore
Geology comments: Fine-grained, pale grey, muddy bioclastic limestone
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:3675
Authorizer:A. Miller, M. Hopkins Enterer:P. Novack-Gottshall, M. Hopkins
Modifier:P. Wagner Research group:marine invertebrate
Created:1999-08-06 12:28:43 Last modified:2018-04-14 23:23:04
Access level:the public Released:1999-08-06 12:28:43
Creative Commons license:CC BY
Reference information

Primary reference:
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]

Secondary references:

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]