Cwm Clyd (Ordovician of the United Kingdom)

Also known as Williams and Wright #2

Where: Wales, United Kingdom (51.8° N, 3.6° W: paleocoordinates 46.8° S, 17.6° W)

• small collection-level geographic resolution

When: Rawtheyan (448.8 - 445.2 Ma)

• no formation name given.

• member-level stratigraphic resolution

Environment/lithology: offshore; lithified, bioturbated, concretionary, pyritic, gray siltstone

• dark to blue-grey muddy siltstones weathering paler or mottled, with manganese stained surfaces. widely dispersed grains of quartz, feldspar, secondary pyrite up to 0.2 mm. bioturbation; nodules several cm diam;

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 8327: authorized by John Alroy, entered by Mike Sommers on 06.07.2000, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
  -
Cephalopoda indet.
Cephalopoda indet. Cuvier 1797
orthocone fragments
Tergomya
 Cyrtonellida - Cyrtolitidae
Cyrtolites sp.
Cyrtolites sp. Conrad 1838
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
 Euomphalina -
Euomphalina sp.
Euomphalina sp. de Koninck 1881 snail
sp. B
 Euomphalina - Platyceratidae
? Cyclonema sp.
? Cyclonema sp. Hall 1852 snail
 Euomphalina - Ophiletidae
Lytospira sp.
Lytospira sp. Koken 1896 snail
 Bellerophontida -
"Bellerophontacea indet." = Bellerophontoidea
"Bellerophontacea indet." = Bellerophontoidea M'Coy 1851 snail
bellerophontacean
 Murchisoniina - Loxonematidae
Loxonema sp.
Loxonema sp. Phillips 1841 snail
 Murchisoniina - Lophospiridae
Lophospira sp., ? Lophospira sp., Gyronema sp.
Lophospira sp. Whitfield 1886 snail
? Lophospira sp. Whitfield 1886 snail
sp. C
Gyronema sp. Ulrich and Scofield 1897 snail
Bivalvia
  -
Bivalvia indet.
Bivalvia indet. Linnaeus 1758 clam
3x nuculacean, 1x smooth taxodont, 1x bivalve indet.
 Nuculida - Praenuculidae
Praenucula sp.
Praenucula sp. Pfab 1934 clam
plus 1 "? Praenucula"
Hyolitha
 Orthothecida - Orthothecidae
Bactrotheca sp.
Bactrotheca sp. Novak 1891
 Hyolithida - Hyolithidae
? Hyolithidae indet.
? Hyolithidae indet. Nicholson 1889
? hyolithid
Brachiopoda
  -
Brachiopoda indet.
Brachiopoda indet. Cuvier 1805
spire bearer
Rhynchonellata
 Atrypida - Cyclospiridae
Cyclospira sp.
Cyclospira sp. Hall and Clarke 1893
 Atrypida - Atrypinidae
Eospirigerina sp.
Eospirigerina sp. Schuchert and Cooper 1930
 Orthida - Dalmanellidae
Dalmanellidae indet., Onniella sp., Dedzetina sp., Dalmanella cf. sculpta
Dalmanellidae indet. Schuchert 1913
dalmanellid
Onniella sp. Bancroft 1928
 Orthida - Plaesiomyidae
Plaesiomys cf. porcata
 Orthida - Orthidae
? Orthambonites sp.
? Orthambonites sp. Pander 1830
 Orthida - Cremnorthidae
Cremnorthis sp. n. sp.
Cremnorthis sp. n. sp. Williams 1963
Strophomenata
 Strophomenida - Christianiidae
Christiania sp.
Christiania sp. Hall and Clarke 1892
 Strophomenida - Hesperomenidae
"Trimurellina sp." = Kassinella (Trimurellina)
"Trimurellina sp." = Kassinella (Trimurellina) Mitchell 1977
 Strophomenida - Sowerbyellidae
? Sowerbyellidae indet., Eoplectodonta sp., Kozlowskites sp.
? Sowerbyellidae indet. Opik 1930
sowerbyellid
Eoplectodonta sp. Kozlowski 1929
Kozlowskites sp. Havlicek 1952
 Strophomenida - Leptestiidae
Leptestiina sp., Leangella sp., Leangella cf. scissa
Leptestiina sp. Opik 1933
plus 2 "? Leptestiina," 2x leptestiinid nov., 1x leptestiinid
Leangella sp. Opik 1933
Leangella cf. scissa Davidson 1871
 Strophomenida - Aegiromenidae
Aegiromena sp., Chonetoidea sp.
Aegiromena sp. Havlícek 1961
Chonetoidea sp. Jones 1928
 Strophomenida -
"Plectambonitacea indet." = Plectambonitoidea, "Strophomenacea indet." = Strophomenoidea
"Plectambonitacea indet." = Plectambonitoidea Jones 1928
plectambonitacean
"Strophomenacea indet." = Strophomenoidea King 1846
strophomenacean
 Strophomenida - Foliomenidae
Foliomena cf. joliensis
 Strophomenida - Strophomenidae
? Gunnarella sp.
? Gunnarella sp. Spjeldnaes 1957
 Strophomenida - Rafinesquinidae
Leptaena rugosa
Leptaena rugosa Dalman 1828
Articulata
  -
Articulata indet.
Articulata indet.
articulate
Lophophorata
 Tentaculitida - Tentaculitidae
Tentaculites sp.
Tentaculites sp. von Schlotheim 1820
Stenolaemata
 Trepostomata -
Trepostomata indet.
Trepostomata indet. Ulrich 1882
trepostome
 Cryptostomata -
Cryptostomata indet.
Cryptostomata indet. Vine 1884
cryptostome
Deuteropoda
  -
Ostracoda indet.
Ostracoda indet. Latreille 1802 ostracod
Trilobita
  -
Trilobita indet.
Trilobita indet. Walch 1771 trilobite
 Phacopida - Encrinuridae
Dindymene ? hughesiae
 Phacopida - Cheiruridae
Sphaerocoryphe thomsoni
 Asaphida - Remopleurididae
Remopleurides sp.
Remopleurides sp. Portlock 1843 trilobite
 Trinucleida - Trinucleidae
Tretaspis cf. seticornis
Tretaspis cf. seticornis Hisinger 1840 trilobite
 Trinucleida - Raphiophoridae
"Lonchodomas aff. portocki" = Lonchodomas portlocki
"Lonchodomas aff. portocki" = Lonchodomas portlocki Barrande 1846 trilobite
 Lichida - Lichidae
Platylichas sp., Hemiarges sp.
Platylichas sp. Gürich 1901 trilobite
Hemiarges sp. Gürich 1901 trilobite
 Corynexochida - Illaenidae
Stenopareia sp.
Stenopareia sp. Holm 1886 trilobite
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
ossicles