Dicoelosia Comm., Elton Fm., Welsh Borderland (Silurian of the United Kingdom)

Where: England, United Kingdom (52.0° N, 3.0° W: paleocoordinates 27.9° S, 13.0° W)

• basin-level geographic resolution

When: Lower Elton Formation, Gorstian (427.4 - 425.6 Ma)

• May extend into Middle Elton.

• formation-level stratigraphic resolution

Environment/lithology: marine; bioturbated mudstone

• "The D. comm. is regarded by C&H as depth equiv. of Clorinda Comm. and appart from rare Visbyella Comm. to be the deepest water benthic comm. of the Ludlovian shelf in the Welsh Borderland. Apart from the normal correlation of lithology with depth (i.e. little coarse sed. in deep water), no good correlation has been seen between sediment type and community. The abundance of Skenidioides is consistent witha BA 5 position."
• [No lithologic description. See geology comments. Lawson (ref. 6658) mentions bioturbated muds.]

Size class: macrofossils

Collection methods: Based on Calef and Hancock 1974 (ref. 6660) and Lawson 1975 (ref. 6663). Abundance data are given, but only brachiopods are treated in complete detail.

Primary reference: J. D. Lawson. 1999. Calef and Hancock's Ludlow communities in Wales and the Welsh Borderland. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 384-387 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 23178: authorized by Michael Foote, entered by Michael Foote on 10.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Athyrida indet.
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
Cephalopoda
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
orthocones
Bivalvia
  -
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
Strophomenata
 Orthotetida - Chilidiopsidae
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949
 Strophomenida - Strophonellidae
"Strophoprion sp." = Strophonella
"Strophoprion sp." = Strophonella Hall 1879
 Strophomenida - Furcitellidae
Katastrophomena sp.
 Strophomenida - Leptostrophiidae
"Leptostrophia (Leptostrophiella) filosa" = Mesoleptostrophia filosa
"Leptostrophia (Leptostrophiella) filosa" = Mesoleptostrophia filosa Sowerby 1839
 Strophomenida - Rafinesquinidae
Leptaena spp., Leptaena aff. purpurea
Leptaena spp. Dalman 1828
 Strophomenida - Amphistrophiidae
"Amphistrophiella spp." = Amphistrophia (Amphistrophiella)
"Amphistrophiella spp." = Amphistrophia (Amphistrophiella) Harper and Boucot 1978
 Strophomenida - Eopholidostrophiidae
Mesopholidostrophia spp.
 Strophomenida - Aegiromenidae
"Aegiria grayi" = Jonesea grayi
"Aegiria grayi" = Jonesea grayi Davidson 1849
 Strophomenida - Leptestiidae
Leangella sp.
Leangella sp. Opik 1933
 Strophomenida - Strophochonetidae
Shagamella sp., Protochonetes minimus
Shagamella sp. Boucot and Harper 1968
Protochonetes minimus Sowerby 1839
Rhynchonellata
 Rhynchonellida - Trigonirhynchiidae
Rhynchotreta cuneata, Trigonirhynchia sp., Microsphaeridiorhynchus nucula
Trigonirhynchia sp. Cooper 1942
 Rhynchonellida - Hebetoechiidae
Sphaerirhynchia wilsoni
Sphaerirhynchia wilsoni de Sowerby 1816
 Athyridida - Meristellidae
Whitfieldella sp.
Whitfieldella sp. Hall and Clarke 1893
 Athyridida - Hyattidinidae
Hyattidina sp.
Hyattidina sp. Schuchert 1913
 Athyridida - Nucleospiridae
Nucleospira sp.
Nucleospira sp. Hall 1859
 Spiriferida - Delthyrididae
Howellella spp.
Howellella spp. Kozlowski 1946
 Spiriferida - Cyrtiidae
Eospirifer sp., Striispirifer sp., Cyrtia sp.
Eospirifer sp. Schuchert 1913
Striispirifer sp. Cooper and Muir-Wood 1951
Cyrtia sp. Dalman 1828
 Atrypida - Glassiidae
Glassia sp.
Glassia sp. Davidson 1881
 Atrypida - Lissatrypidae
"Nanospira sp." = Lissatrypa
"Nanospira sp." = Lissatrypa Twenhofel 1914
 Atrypida - Atrypidae
Atrypa sp.
Atrypa sp. Dalman 1828
[entered as Atypa sp.]
 Protorthida - Skenidiidae
Skenidioides sp.
Skenidioides sp. Schuchert and Cooper 1931
 Orthida -
Orthida indet.
Orthida indet. Schuchert and Cooper 1932
 Orthida - Draboviidae
Salopina sp.
Salopina sp. Boucot 1960
 Orthida - Dalmanellidae
Isorthis sp., Resserella canalis, cf. Visbyella cf. trewerna
Isorthis sp. Kozlowski 1929
Resserella canalis Sowerby 1839
 Orthida - Dicoelosiidae
Dicoelosia biloba
Dicoelosia biloba Linnaeus 1758
 Orthida - Rhipidomellidae
Dalejina sp.
Dalejina sp. Havlicek 1953
 Pentamerida - Gypidulidae
Gypidula sp.
Gypidula sp. Hall 1867
Craniata
 Craniopsida - Craniopsidae
Craniops sp.
Craniops sp. Hall 1859
Lingulata
 Lingulida - Lingulidae
Lingula sp.
Lingula sp. Bruguiére 1797
Ostracoda
 Palaeocopida -
Hemsiella maccoyana
Trilobita
  -
Trilobita indet.
Trilobita indet. Walch 1771 trilobite
 Proetida - Proetidae
Proetidae indet.
Proetidae indet. Salter 1864 trilobite
 Odontopleurida - Odontopleuridae
Leonaspis sp.
Leonaspis sp. Richter and Richter 1917 trilobite
 Phacopida - Calymenidae
Calymene sp.
Calymene sp. Brongniart 1822 trilobite
 Phacopida - Dalmanitidae
Dalmanites myops
Graptolithina
  -
Graptolithina indet.