Isorthis-Microsphaeridiorhynchus nucula Comm., Much Wenlock Lst.: Homerian, United Kingdom

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Strophomenata - Strophomenida - Strophodontidae
Pholidostrophia sp. Hall and Clarke 1892
Strophomenata - Strophomenida - Strophochonetidae
Protochonetes minimus (Sowerby 1839)
Strophomenata - Strophomenida - Amphistrophiidae
Amphistrophia sp. Hall and Clarke 1892
Strophomenata - Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Strophomenata - Orthotetida - Chilidiopsidae
Coolinia sp. Bancroft 1949
spelled with current rank as Fardenia (Coolinia)
Rhynchonellata - Orthida - Dalmanellidae
Isorthis spp.
Resserella sp. Bancroft 1928
Rhynchonellata - Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
[entered as Dalejiina sp.]
Rhynchonellata - Spiriferida - Cyrtiidae
Eospirifer sp. Schuchert 1913
Rhynchonellata - Spiriferida - Delthyrididae
Howellella elegans Muir-Wood 1925
Rhynchonellata - Athyridida - Meristellidae
Whitfieldella sp. Hall and Clarke 1893
Rhynchonellata - Atrypida - Atrypidae
Atrypidae indet. Gill 1871
ribbed atrypid
Atrypa reticularis (Linnaeus 1758)
original and current combination Anomia reticularis
Rhynchonellata - Atrypida - Glassiidae
Glassia sp. Davidson 1881
genus name in quotes
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Rhynchotreta sp. Hall 1879
Microsphaeridiorhynchus nucula (Sowerby 1839)
Rhynchonellata - Rhynchonellida - Hebetoechiidae
Sphaerirhynchia wilsoni (de Sowerby 1816)
see common names

Geography
Country:United Kingdom State/province:Wales
Coordinates: 51.7° North, 2.9° West (view map)
Paleocoordinates:29.2° South, 13.3° West
Basis of coordinate:based on political unit
Geographic resolution:local area
Time
Period:Silurian Epoch:Wenlock
Stage:Homerian 10 m.y. bin:Silurian 2
*International age/stage:Late/Upper Homerian
Key time interval:Homerian Graptolite zone: Colonograptus ludensis
Age range of interval:430.50000 - 427.40000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Much Wenlock
Stratigraphic resolution:member
Stratigraphy comments: upper parts of Much Wenlock Lst.
Lithology and environment
Primary lithology:shelly/skeletal wackestone
Secondary lithology: silty mudstone
Lithology description: "...found in nodula limestone lithofacies. Brachiopods occur in elongate nodules surrounded by parallel laminated silty mudstone. 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.
Environment:marine indet.
Geology comments: "..rhynchonellids commonly articulated by that of dalmanellids varies. Lithofacies shows no signs of current activity and is interp. to be relatiely deep water, low energy deposit. Possibly BA 3."
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some macrofossils
Reason for describing collection:paleoecologic analysis
Taxonomic list comments:Only brachiopods are studied thoroughly, but non-brachiopod elements are said to be virtually absesnt.
Metadata
Database number:23287
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Uhen Research group:marine invertebrate
Created:2002-07-11 12:29:22 Last modified:2018-11-26 18:22:50
Access level:the public Released:2002-07-11 12:29:22
Creative Commons license:CC BY
Reference information

Primary reference:
6676. 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]