Roadside near Chapel (Ordovician of the United Kingdom)

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

• small collection-level geographic resolution

When: Rawtheyan (455.8 - 445.6 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 8370: authorized by John Alroy, entered by Mike Sommers on 10.07.2000, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Othacea indet.
orthacean
Leptestiinidae indet.
leptestiinid
Trilobita
 Corynexochida - Illaenidae
Illaenidae indet. Hawle and Corda 1847 trilobite
illaenid
Stenopareia sp. Holm 1886 trilobite
 Phacopida - Dalmanitidae
Mucronaspis sp. Destombes 1963 trilobite
 Phacopida - Calymenidae
Calymenidae indet. Milne-Edwards 1840 trilobite
calymenid
Gravicalymene sp. Shirley 1936 trilobite
 Asaphida - Asaphidae
"Opsimasaphus sp." = Birmanites
"Opsimasaphus sp." = Birmanites Sheng 1934 trilobite
Ostracoda
 Podocopa -
Palaeocopida indet. Henningsmoen 1953 ostracod
including 5 "reticulate" palaeocopes
Hyolitha
  -
Hyolitha indet. Marek 1963
hyolith
 Orthothecida - Orthothecidae
Orthothecidae indet. Syssoiev 1957
orthothecid
Bactrotheca sp. Novak 1891
including 3 ? Bactrotheca
 Hyolithida -
 Hyolithida - Hyolithidae
Sololites sp. Marek 1967
Strophomenata
 Orthotetida - Triplesiidae
 Strophomenida - Bimuriidae
? Bimuria sp. Ulrich and Cooper 1942
 Strophomenida - Aegiromenidae
Sericoidea sp. Lindström 1953
? Chonetoidea sp. Jones 1928
Chonetoidea sp. Jones 1928
 Strophomenida -
"Plectambonitacea indet." = Plectambonitoidea
"Plectambonitacea indet." = Plectambonitoidea Jones 1928
plectambonitacean
 Strophomenida - Hesperomenidae
"Trimurellina sp." = Kassinella (Trimurellina)
"Trimurellina sp." = Kassinella (Trimurellina) Mitchell 1977
 Strophomenida - Leptostrophiidae
? Eostropheodonta sp. Bancroft 1949
 Strophomenida - Rafinesquinidae
Rhactomena sp. Mitchell 1977
Leptaena sp. Dalman 1828
"Leptaena rugosa" = Leptaena (Leptaena) rugosa Dalman 1828
 Strophomenida -
"Strophomenacea indet." = Strophomenoidea
"Strophomenacea indet." = Strophomenoidea King 1846
strophomenacean
Rhynchonellata
 Atrypida - Cyclospiridae
Cyclospira sp. Hall and Clarke 1893
 Orthida - Dalmanellidae
Dalmanellidae indet. Schuchert 1913
dalmanellid
Dalmanella sp. Hall and Clarke 1892
 Orthida - Glyptorthidae
? Glyptorthis sp. Foerste 1914
 Orthida - Rhactorthidae
? Rhactorthis sp. Williams 1963
Machaeridia
  -
Machaeridia indet.
macheridian
Bivalvia
  -
Bivalvia indet. Linnaeus 1758 clam
1x mytiliform, 1x reticulate
 Protobranchia - Ctenodontidae
Ctenodontidae indet. Wöhrmann 1893 clam
ctenodontid
 Nuculida - Praenuculidae
Praenucula sp. Pfab 1934 clam
including 22x ? Praenucula
 Nuculida - Cardiolariidae
Deceptrix sp. Fuchs 1919 clam
 Nuculida -
Nuculacea indet. Gray 1824 clam
nuculacean
Gastropoda
  -
Gastropoda indet. Cuvier 1797 snail
6 high spired, 36 gastro indet, 1 discoidal
Gastropoda sp. Cuvier 1797 snail
 Trochonematoidea - Lophospiridae
Lophospira sp. Whitfield 1886 snail
17 L. sp., 41 L. sp. C, 11 L. sp. B, 155 L. sp. A
Donaldiella sp. Cossmann 1903 snail
 Euomphalina - Euomphalidae
Euomphalus sp. Sowerby 1814 snail
sp. A
 Euomphalina - Anomphalidae
Anomphalidae indet. Wenz 1938 snail
anomphalid
 Euomphalina - Holopeidae
Holopea sp. Hall 1847 snail
 Euomphalina - Elasmonematidae
? Streptotrochus sp. Perner 1907 snail
including 4x cf. ? Streptotrochus
 Bellerophontida -
Bellerophontoidea indet. M'Coy 1851 snail
bellerophontacean
 Bellerophontida - Plectonotidae
Tritonophon aff. bohemica Perner 1903 snail
 Bellerophontida - Tropidodiscidae
Tropidodiscus sp. Meek and Worthen 1866 snail
 Murchisoniina - Eotomariidae
? Eotomaria sp. Ulrich and Scofield 1897 snail
 Murchisoniina - Murchisoniidae
Murchisonia sp. d'Archiac and de Verneuil 1841 snail
 Murchisoniina - Loxonematidae
Loxonema sp. Phillips 1841 snail
3 sp., 86 L. sp. A
 Pleurotomariida -
"Pleurotomariacea indet." = Pleurotomarioidea
"Pleurotomariacea indet." = Pleurotomarioidea Swainson 1840 snail
pleurotomaria
Tergomya
 Cyrtonellida - Cyrtolitidae
Cyrtolites sp. Conrad 1838
 Tryblidiida - Tryblidiidae
Cephalopoda
 Orthocerida - Kionoceratidae
Polygrammoceras sp. Foerste 1927
 Orthocerida - Orthoceratidae
Orthoceras sp. Breynius 1832
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
Stenolaemata
 Trepostomata -
Trepostomata indet. Ulrich 1882
trepostome
Graptolithina
 Diplograptoidea - Diplograptidae
Diplograptidae indet. diplograptoid
diplograptid
unclassified
  -
Pelmatozoa indet. Leuckart 1848
ossicles
Cystoidea
  -
Cystoidea indet. von Buch 1846
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
ossicles
unclassified
  -
Problematica indet.
as if there weren't enough already
Porifera indet. Grant 1836
sponge
Demospongea
 Lithistida -
Scyphozoa
  -