Brachiopods of upper shelly lens of Skelgill Shale at Yewdale Beck: Rhuddanian, United Kingdom

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Echinodermata indet. Klein 1754
Polychaeta - Phyllodocida
Machaeridia indet.
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Plectothyrella crassicostis (Dalman 1828)
Atrypa crassicostis
Rhynchonellata - Atrypida - Cyclospiridae
? Cyclospira sp. Hall and Clarke 1893
Rhynchonellata - Athyridida - Meristellidae
Hindella sp. Davidson 1882
Rhynchonellata - Orthida - Hesperorthidae
? Dolerorthis sp. Schuchert and Cooper 1931
Rhynchonellata - Orthida - Dalmanellidae
Mirorthis aff. mira Zeng 1983
Dalmanella sp. Hall and Clarke 1892
Rhynchonellata - Orthida - Chrustenoporidae
Jezercia sp. Havlicek and Mergl 1982
Rhynchonellata - Orthida - Draboviidae
? Hirnantia sp. Lamont 1935
Kinnella aff. kielanae (Temple 1965)
synonym of Kinnella medlicotti
Ostracoda
Ostracoda indet. Latreille 1802
see common names

Geography
Country:United Kingdom State/province:England County:Cumbria
Coordinates: 54.4° North, 3.1° West (view map)
Paleocoordinates:34.4° South, 16.4° West
Basis of coordinate:based on political unit
Geographic resolution:small collection
Time
Period:Silurian Epoch:Llandovery
Stage:Rhuddanian 10 m.y. bin:Silurian 1
*International age/stage:Early/Lower Rhuddanian
Key time interval:Rhuddanian Zone: Parakidograptus acuminatus
Age range of interval:443.80000 - 440.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Skelgill
Stratigraphic resolution:bed
Lithology and environment
Primary lithology:planar lamination,shelly/skeletal,gray lithified "shale"
Includes fossils?Y
Lithology description: "The Skelgill Formation in the western Lake District consists mainly of black shales ranging in age from the P. persculptus Biozone (uppermost Ordovician) to the S. sedgwickii Biozone (upper middle Silurian). In its lowest part, however, it preserves both shelly and graptolite faunas. Kneller et al. (1994, p. 231) assigned the pale limestones, commonly with nodules, at the base of the formation to the Spengill Member. Deposition in an anoxic, relatively deep basin has been suggested for the formation, probably to the west of active fault scarps." Addition discussion mentions "slightly calcareous, shelly mudstones" just above Ordovician/Silurian boundary. Stratigraphic section lists "Black, pyritic shale with abundant graptolites" for bed A, "Grey, laminated shale with occasional graptolite and brachiopod-rich intervals" for beds B-F, and "Skelgill Shale with graptolites and rare brachiopods" for beds G-H.
Environment:marine indet.
Geology comments: "The small size of many of the specimens together with the presence of Hindella, Kinella, and Paromalomena suggest a deeper-water setting for the fauna in lower Benthic Assemblage (BA) 3..."
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:13806
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Uhen Research group:marine invertebrate
Created:2002-04-27 16:36:02 Last modified:2018-11-26 17:07:45
Access level:the public Released:2002-04-27 16:36:02
Creative Commons license:CC BY
Reference information

Primary reference:
6149. D. A. T. Harper and S. H. Williams. 2002. A relict Ordovician brachiopod fauna from the Parakidograptus acuminatus Biozone (Lower Silurian) of the English Lake District. Lethaia 35(1):71-78 [M. Foote/M. Foote/M. Foote]