Nant Hir Mudstones trilobites (Ordovician to of the United Kingdom)

Where: Wales, United Kingdom (52.9° N, 3.6° W: paleocoordinates 53.3° S, 18.7° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Nant Hir Mudstones Formation (Lower Bala Group), Costonian to Costonian (460.9 - 455.8 Ma)

• upper part of formation above Derfel Limestone

• member-level stratigraphic resolution

Environment/lithology: marine; lithified, blue mudstone and lithified siltstone

• Lithology based on Bassett et al 1966, Quart J Geol Soc 122: 219-271]

Size class: macrofossils

Preservation: mold/impression

Reposited in the BMNH

Primary reference: H. B. Whittington. 1968. The Ordovician trilobites of the Bala Area, Merioneth. Part IV. Monograph of the Palaeontographical Society 122(520):93-138 [M. Hopkins/M. Hopkins]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 188594: authorized by Melanie Hopkins, entered by Melanie Hopkins on 08.09.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Phacopida - Homalonotidae
Brongniartella sp. Reed 1918 trilobite
 Phacopida - Calymenidae
Flexicalymene sp. Shirley 1936 trilobite
 Asaphida - Raphiophoridae
Ampyx sp. Dalman 1827 trilobite
 Asaphida - Trinucleidae
Strophomenata
 Strophomenida - Sowerbyellidae
"Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea
"Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea Sowerby 1839
subspecies permixta
 Strophomenida - Aegiromenidae
Sericoidea abdita Whittington and Williams 1955
 Strophomenida - Rafinesquinidae
? Hedstroemina sp. Bancroft 1929
Rhynchonellata
 Orthida - Dalmanellidae
 Orthida - Harknessellidae
Reuschella horderleyensis Bancroft 1929
subspecies undulata
 Orthida - Plaesiomyidae
Dinorthis berwynensis Whittington 1938
Lingulata
 Lingulida - Obolidae
Lingulella sp. Salter 1866