Isorthis Comm. Bringewood Grp., 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: Polygnathoides siluricus conodont zone, Bringewood Group, Gorstian (427.4 - 425.6 Ma)

• Especially in the thicker Lower Bringewood Formation.

Environment/lithology: marine; siliciclastic sediments

• "The Isorthis Comm. is regarded by C&H as the depth equiv. of the Stricklandia Comm. of the Upper Llandovery, which is consistent with the presence of Dicoelosia, Skenidioides, Aegiria, and Shagamella, i.e. BA 4. The presence of Kirkidium in low abundance can be ascribed to downslope trnasport from BA 3."
• Ref. 6661: [No lithologic description. See geology comments.]

•Ref. 6660: "clastic sediments"

Size class: macrofossils

Collection methods: Based on Calef and Hancock 1974 (ref. 6660). Abundance data are given, but only brachiopods are treated in detail. This is similar to PBDB coll. 535, but that collection does not include all the elements listed here.

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 23181: 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.
Lingulata
 Lingulida - Lingulidae
Lingula sp.
Lingula sp. Bruguiére 1797
 Lingulida - Discinidae
Schizotreta sp.
Schizotreta sp. Kutorga 1848
Craniata
 Craniopsida - Craniopsidae
Craniops sp.
Craniops sp. Hall 1859
Strophomenata
 Orthotetida - Chilidiopsidae
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949
 Strophomenida -
Strophochonetes sp.
Strophochonetes sp. Muir-Wood 1962
 Strophomenida - Strophochonetidae
Shagamella sp., Protochonetes ludloviensis, Protochonetes minimus
Shagamella sp. Boucot and Harper 1968
Protochonetes minimus Sowerby 1839
 Strophomenida - Aegiromenidae
"Aegiria grayi" = Jonesea grayi
"Aegiria grayi" = Jonesea grayi Davidson 1849
 Strophomenida - Shaleriidae
Shaleria sp.
Shaleria sp. Caster 1939
 Strophomenida - Eopholidostrophiidae
Mesopholidostrophia spp.
 Strophomenida - Strophonellidae
"Strophoprion sp." = Strophonella
"Strophoprion sp." = Strophonella Hall 1879
 Strophomenida - Leptostrophiidae
"Leptostrophiella filosa" = Mesoleptostrophia
"Leptostrophiella filosa" = Mesoleptostrophia
 Strophomenida - Amphistrophiidae
"Amphistrophiella spp." = Amphistrophia (Amphistrophiella)
"Amphistrophiella spp." = Amphistrophia (Amphistrophiella) Harper and Boucot 1978
 Strophomenida - Rafinesquinidae
Leptaena spp.
Leptaena spp. Dalman 1828
Rhynchonellata
 Pentamerida - Gypidulidae
Gypidula sp.
Gypidula sp. Hall 1867
 Pentamerida - Pentameridae
Kirkidium sp.
Kirkidium sp. Amsden et al. 1967
 Spiriferida - Delthyrididae
Howellella spp.
Howellella spp. Kozlowski 1946
 Spiriferida - Cyrtiidae
Eospirifer sp.
Eospirifer sp. Schuchert 1913
 Athyridida - Meristellidae
Meristina sp., Whitfieldella sp.
Meristina sp. Hall 1867
Whitfieldella sp. Hall and Clarke 1893
 Athyridida - Dayiidae
Dayia sp.
Dayia sp. Davidson 1881
 Athyridida - Rhynchospirinidae
Homoeospira sp.
Homoeospira sp. Hall and Clarke 1893
 Atrypida - Glassiidae
Glassia sp.
Glassia sp. Davidson 1881
 Atrypida - Lissatrypidae
Lissatrypa sp.
Lissatrypa sp. Twenhofel 1914
 Atrypida - Atrypidae
Atrypa sp.
Atrypa sp. Dalman 1828
 Protorthida - Skenidiidae
Skenidioides sp.
Skenidioides sp. Schuchert and Cooper 1931
 Rhynchonellida - Trigonirhynchiidae
Microsphaeridiorhynchus nucula
 Rhynchonellida - Hebetoechiidae
Sphaerirhynchia wilsoni
Sphaerirhynchia wilsoni de Sowerby 1816
 Orthida - Draboviidae
Salopina sp.
Salopina sp. Boucot 1960
 Orthida - Dicoelosiidae
Dicoelosia biloba
Dicoelosia biloba Linnaeus 1758
 Orthida - Rhipidomellidae
Dalejina sp.
Dalejina sp. Havlicek 1953
 Orthida - Dalmanellidae
Isorthis sp.
Isorthis sp. Kozlowski 1929