H42A (Silurian of the United Kingdom)

Where: Wales, United Kingdom (51.8° N, 5.0° W: paleocoordinates 36.9° S, 17.9° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: atavus - acinaces zone, Rhuddanian (443.4 - 440.8 Ma)

• 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."

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified mudstone and sandstone

Collection methods: bulk,

• "... 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: 100 mm, 4.0 kg.

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

Purpose of describing collection: taxonomic analysis

PaleoDB collection 5059: authorized by John Alroy, entered by Mike Sommers on 26.08.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Brachiopods... form the overwhelming preponderance of early Llandovery shelly faunas in Wales."
Strophomenata
 Strophomenida - Strophonellidae
"Strophonella (Eostrophonella) eothen" = Eostrophonella eothen
"Strophonella (Eostrophonella) eothen" = Eostrophonella eothen Williams 1951
sgn. (Eostrophonella)
 Strophomenida - Eopholidostrophiidae
 Strophomenida - Leptestiidae
Leangella scissa Davidson 1871
 Strophomenida - Sowerbyellidae
"Eoplectodonta duplicata" = Eoplectodonta (Eoplectodonta) duplicata
"Eoplectodonta duplicata" = Eoplectodonta (Eoplectodonta) duplicata de Sowerby and Murchison 1839
 Orthotetida - Chilidiopsidae
Saughina pertinax Reed 1917
morph pertinax
Rhynchonellata
 Atrypida - Lissatrypidae
Meifodia prima Williams 1951
ssp. indet.
 Atrypida - Atrypinidae
"Plectatrypa tripartita" = Eospirigerina tripartita
"Plectatrypa tripartita" = Eospirigerina tripartita de Sowerby and Murchison 1839
ssp. tripartita
 Rhynchonellida - Rhynchotrematidae
Stegerhynchus pusillum de Sowerby and Murchison 1839
 Orthida - Hesperorthidae
 Orthida - Draboviidae
Pionodema sp. Foerste 1912
 Orthida - Rhipidomellidae
Mendacella mullockiensis Davidson 1869
"llandoveriana morph"
 Pentamerida - Stricklandiidae
Stricklandia ? lens Sowerby 1839
ssp. mullochensis
 Athyridida - Meristellidae
"? Hyattidina angustifrons" = Hindella angustifrons
"? Hyattidina angustifrons" = Hindella angustifrons Salter 1851