NB01B: Rhuddanian - Aeronian, United Kingdom

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Strophomenata - Strophomenida - Sowerbyellidae
Eoplectodonta duplicata (de Sowerby and Murchison 1839)
63 specimens
recombined as Eoplectodonta (Eoplectodonta) duplicata
Anisopleurella gracilis (Jones 1928)
8 specimens
recombined as Kozlowskites gracilis
Strophomenata - Strophomenida - Leptestiidae
Leangella scissa (Davidson 1871)
40 specimens
Rhynchonellata - Orthida - Hesperorthidae
Dolerorthis sowerbyiana (Davidson 1869)
1 specimen
Rhynchonellata - Orthida - Rhipidomellidae
Mendacella mullockiensis (Davidson 1869)
12 specimens
"llandoveriana morph"
Rhynchonellata - Orthida - Dalmanellidae
Visbyella sp. Walmsley et al. 1968
6 specimens
sp. nov.
Rhynchonellata - Protorthida - Skenidiidae
Skenidioides ? woodlandiense (Davidson 1882)
29 specimens
recombined as Skenidioides woodlandiensis
Rhynchonellata - Atrypida - Lissatrypidae
Meifodia prima (Williams 1951)
3 specimens
ssp. indet.
see common names

Geography
Country:United Kingdom State/province:Wales County:Clwyd
Coordinates: 53.0° North, 3.3° West (view map)
Paleocoordinates:34.7° South, 16.6° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period:Silurian Epoch:Llandovery
10 m.y. bin:Silurian 1
*Period:Early/Lower Silurian *Epoch:Early/Lower Llandovery - Middle Llandovery
*International age/stage:Late/Upper Rhuddanian - Late/Upper Aeronian
Key time interval:Rhuddanian - Aeronian
Age range of interval:443.40000 - 438.50000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Stratigraphic resolution:bed
Stratigraphy comments: Unless a conodont zone was explicitly stated, a Late Rhudd - Late Aeron age was entered because of the statement these beds are all "pre-sedgwickii Zone."
Lithology and environment
Primary lithology: lithified mudstone
Secondary lithology: sandstone
Environment:marine indet.
Taphonomy
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:bulk,field collection
Reason for describing collection:taxonomic analysis
Collection method comments: "... a single collection (from bulk material) [was made] from each locality, identifying and recording all fossils encountered during break up of the rock... [sacrificing commoner taxa in continued searching, or preserving rarer specimens and not breaking the rock further]...figures obtained for relative frequencies of the taxa are prob accurate...estimates of volumetric abundance...are prob too low." Sample: 300 mm thick, 9.1 kg
Taxonomic list comments:"Brachiopods... form the overwhelming preponderance of early Llandovery shelly faunas in Wales."
Metadata
Database number:4928
Authorizer:J. Alroy Enterer:M. Sommers
Modifier:C. Visaggi Research group:marine invertebrate
Created:1999-08-26 16:44:00 Last modified:2004-03-11 16:25:07
Access level:the public Released:2000-11-20 13:53:24
Creative Commons license:CC BY
Reference information

Primary reference:

196. J. T. Temple. 1987. Early Llandovery brachiopods of Wales. Palaeontological Society Monographs 139(572):1-137 [J. Alroy/M. Sommers/M. Uhen]