M. nucula-'Glassia'-Rothpleztella/Girvanella Comm., Much Wenlock Lst. (Silurian of the United Kingdom)

Where: England, United Kingdom (53.0° N, 2.0° W: paleocoordinates 27.9° S, 12.9° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Much Wenlock Formation, Homerian (430.5 - 427.4 Ma)

• ludensis and nassa Zones

• formation-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal wackestone and shelly/skeletal packstone

• "...deposited in low energy mid-shelf setting. Oncoid morphologies indicate low energy conditions but in shallow water...shells scattered within beds, commonly disarticulated but unabraded...This combined with random distribution suggests bioturbation...supported by lack of depositional fabrics...abundance of algae in sediment...BA 2 likely."
• "...thick bedded oncoid-rich lithofacies..." From Ratcliffe (1991) (ref. 6688): facies composed of Lst beds 200-500 m thick, with little or no silty mudstone. Lst beds composed of oncoidal wackestones and packstones with occasional 30-50 mm thick beds of skeletal grainstone. Large algal bioherms occur.

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 23284: authorized by Michael Foote, entered by Michael Foote on 11.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Only brachiopods are studied thoroughly.
Show authors, comments, and common names
Rhynchonellata
 Rhynchonellida - Hebetoechiidae
Sphaerirhynchia wilsoni
Sphaerirhynchia wilsoni de Sowerby 1816
 Rhynchonellida - Trigonirhynchiidae
Rhynchotreta sp., Microsphaeridiorhynchus nucula
Rhynchotreta sp. Hall 1879
 Atrypida - Atrypidae
Atrypidae indet.
Atrypidae indet. Gill 1871
ribbed atrypids
 Atrypida - Glassiidae
Glassia sp.
Glassia sp. Davidson 1881
genus name in quotes
 Pentamerida - Gypidulidae
Gypidula sp.
Gypidula sp. Hall 1867
 Pentamerida - Clorindidae
Antirhynchonella sp.
Antirhynchonella sp. Oehlert 1887
 Spiriferida - Cyrtinopsidae
Kozlowskiellina sp.
Kozlowskiellina sp. Boucot 1958
 Spiriferida - Delthyrididae
Howellella elegans
Howellella elegans Muir-Wood 1925
 Spiriferida - Cyrtiidae
Cyrtia sp.
Cyrtia sp. Dalman 1828
 Athyridida - Meristellidae
Whitfieldella sp.
Whitfieldella sp. Hall and Clarke 1893
 Athyridida - Nucleospiridae
Nucleospira sp.
Nucleospira sp. Hall 1859
Strophomenata
 Orthotetida - Chilidiopsidae
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949
 Strophomenida - Sowerbyellidae
Eoplectodonta sp.
Eoplectodonta sp. Kozlowski 1929
Rothpletzella
  -
Rothpletzella sp.
Rothpletzella sp. Wood 1948
algae
Hormogoneae
 Oscillatoriales - Girvanellaceae
Girvanella sp.
Girvanella sp. Nicholson and Etheridge 1878
algae