Howellella-elegans-Ribbed Atrypid Comm., Much Wenlock Lst. (Silurian of the United Kingdom)

Where: England, United Kingdom (52.0° N, 2.6° W)

• Paleocoordinates: 15.9° S, 53.6° W (Wright 2013)

• coordinate based on political unit

• local area-level geographic resolution

When: Colonograptus ludensis graptolite zone, Much Wenlock Formation, Homerian (430.5 - 427.4 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal wackestone and silty mudstone

• Abundant crinoid stems, some still articulated, suggest crinoid thicket. Lenses also contain corals, bryozoans, stromatoporoids. Nodular Lst facies surround lenses generally sparsely fossiliferous. Thick slightly raised above sea floor, resulting in concentration of fauna. Surround Lst shows no evidence of current, suggesting deep-water, below wave base. Brachiopods of both hard and soft substrates. Probably BA 3.
• "..occurs in limestone lenses up to 5 m X 2 m [in nodular limestone lithofacies]."

•From Ratcliffe 1991 (ref. 6688): facies is composed of discontinuous beds and nodules of carbonate mudstone, skeletal wackestone or skeletal packstone, separated by varying proportions of silty mudstone, which can form 20-90% of rock volume.

Size class: macrofossils

Primary reference: K. T. Ratcliffe. 1999. Brachiopod assemblages from the Much Wenlock Limestone Formation of England and Wales. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 399-407 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 23286: authorized by Michael Foote, entered by Michael Foote on 11.07.2002

Creative Commons license: CC0 (CC0)

Taxonomic list

• Only brachiopods are studied thoroughly.
Show authors, comments, and common names
unclassified
  -
Echinodermata indet.
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
Rhynchonellata
 Spiriferida - Cyrtiidae
Eospirifer sp.
Eospirifer sp. Schuchert 1913
 Spiriferida - Delthyrididae
Howellella elegans
Howellella elegans Muir-Wood 1925
 Spiriferida - Cyrtinopsidae
Kozlowskiellina sp.
Kozlowskiellina sp. Boucot 1958
 Rhynchonellida - Trigonirhynchiidae
Microsphaeridiorhynchus sp.
 Rhynchonellida - Hebetoechiidae
Sphaerirhynchia sp.
Sphaerirhynchia sp. Cooper and Muir-Wood 1951
 Athyridida - Meristellidae
Whitfieldella sp.
Whitfieldella sp. Hall and Clarke 1893
 Pentamerida - Gypidulidae
Gypidula sp.
Gypidula sp. Hall 1867
 Pentamerida - Clorindidae
Antirhynchonella sp.
Antirhynchonella sp. Oehlert 1887
 Orthida - Dalmanellidae
Resserella sp., Isorthis sp.
Resserella sp. Bancroft 1928
Isorthis sp. Kozlowski 1929
 Atrypida - Glassiidae
Glassia sp.
Glassia sp. Davidson 1881
genus name in quotes
 Atrypida - Atrypidae
Atrypidae indet., Atrypa reticularis
Atrypidae indet. Gill 1871
ribbed atrypid
Atrypa reticularis Linnaeus 1758
Strophomenata
 Orthotetida - Chilidiopsidae
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949
 Strophomenida - Strophochonetidae
Protochonetes sp.
Protochonetes sp. Muir-Wood 1962
 Strophomenida - Sowerbyellidae
Eoplectodonta sp.
Eoplectodonta sp. Kozlowski 1929
 Strophomenida - Leptostrophiidae
Leptostrophia sp.
Leptostrophia sp. Hall and Clarke 1892
 Strophomenida - Amphistrophiidae
Amphistrophia sp.
Amphistrophia sp. Hall and Clarke 1892
 Strophomenida - Rafinesquinidae
"Leptaena depressa" = Leptaena (Leptaena) depressa, Scamnomena sp.
"Leptaena depressa" = Leptaena (Leptaena) depressa Sowerby 1824
Scamnomena sp. Bassett 1977
Anthozoa
  -
Anthozoa indet.
Anthozoa indet. Ehrenberg 1834
colonial corals
 Favositida - Coenitidae
Coenites sp.
Coenites sp. Eichwald 1829 tabulate coral
 Heliolitida - Halysitidae
Halysites spp.
Halysites spp. von Waldheim 1813 tabulate coral
 Heliolitida - Stelliporellidae
Stelliporella parvistella
 Heliolitida - Heliolitidae
Heliolites spp.
Heliolites spp. Dana 1846 tabulate coral
Stromatoporoidea
 Stromatoporoidea -
Stromatoporoidea indet.
Stromatoporoidea indet. stromatoporoid sponge