Northwest flank east of Wenallt (Ordovician of the United Kingdom)

Where: Wales, United Kingdom (51.8° N, 3.6° W: paleocoordinates 39.1° S, 17.0° W)

• small collection-level geographic resolution

When: Ooid Member (Wenallt Formation), Hirnantian (445.2 - 443.4 Ma)

• member-level stratigraphic resolution

Environment/lithology: offshore; lithified, ooidal, shelly/skeletal, argillaceous, sandy siltstone and sandstone

• sandy and muddy siltstones with ooids alternating with fine to very fine speckly sandstones. abundant fragmentary pelmatozoan and bryozoan material.

Primary reference: 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 8384: authorized by John Alroy, entered by Mike Sommers on 10.07.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Anthozoa
 Rugosa -
Rugosa indet.
Rugosa indet. horn coral
solitary rugose coral
Ostracoda
 Podocopa -
Palaeocopida indet.
Palaeocopida indet. Henningsmoen 1953 ostracod
reticulate palaeocope
Trilobita
 Trinucleida - Trinucleidae
Tretaspis cf. seticornis
Tretaspis cf. seticornis Hisinger 1840 trilobite
 Phacopida - Dalmanitidae
Mucronaspis sp.
Mucronaspis sp. Destombes 1963 trilobite
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Stenolaemata
 Trepostomata -
Trepostomata indet.
Trepostomata indet. Ulrich 1882
trepostome
 Cyclostomata -
Cyclostomata indet.
Cyclostomata indet. Busk 1852
cyclostome
 Cryptostomata -
Cryptostomata indet.
Cryptostomata indet. Vine 1884
cryptostome
 Cryptostomata - Escharoporidae
Escharopora sp.
Escharopora sp. Hall 1847
Articulata
  -
Articulata indet.
Articulata indet.
articulate brach
Craniata
 Craniopsida - Craniopsidae
Paracraniops sp.
Paracraniops sp. Williams 1963
Strophomenata
 Strophomenida -
"Strophomenacea indet." = Strophomenoidea
"Strophomenacea indet." = Strophomenoidea King 1846
strophomenacean
 Strophomenida - Furcitellidae
Katastrophomena sp.
 Strophomenida - Leptostrophiidae
Eostropheodonta hirnantensis
 Strophomenida - Rafinesquinidae
Rhactomena sp., Leptaena sp., Leptaena rugosa
Rhactomena sp. Mitchell 1977
Leptaena sp. Dalman 1828
Leptaena rugosa Dalman 1828
 Strophomenida - Leptestiidae
Sampo sp.
Sampo sp. Opik 1933
 Orthotetida - Chilidiopsidae
? Fardenia sp.
? Fardenia sp. Lamont 1935
 Orthotetida - Triplesiidae
Triplesia sp.
Triplesia sp. Hall 1859
Rhynchonellata
 Orthida - Plaesiomyidae
? Plaesiomys cf. porcata
 Orthida - Glyptorthidae
Glyptorthis sp.
Glyptorthis sp. Foerste 1914
 Orthida -
"Orthacea indet." = Orthoidea
"Orthacea indet." = Orthoidea Woodward 1852
orthacean
 Orthida - Dalmanellidae
Dalmanellidae indet., ? Dalmanella sp., Dalmanella cf. sculpta, ? Howellites sp.
Dalmanellidae indet. Schuchert 1913
dalmanellid
? Dalmanella sp. Hall and Clarke 1892
? Howellites sp. Bancroft 1945
 Orthida - Draboviidae
Hirnantia sagittifera
 Atrypida - Cyclospiridae
Cyclospira sp.
Cyclospira sp. Hall and Clarke 1893
 Athyridida - Meristellidae
? Hindella sp., Hindella incipiens
? Hindella sp. Davidson 1882
Hindella incipiens Williams 1951
Lophophorata
 Tentaculitida - Cornulitidae
Cornulites sp.
Cornulites sp. Schlotheim 1820
Bivalvia
  -
Bivalvia indet.
Bivalvia indet. Linnaeus 1758 clam
unclassified
  -
Pelmatozoa indet.
Pelmatozoa indet. Leuckart 1848
ossicles
Cystoidea
  -
Cystoidea indet.
Cystoidea indet. von Buch 1846
plates
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
ossicles