Gelli-grîn Calcarous Ash trilobites, upper beds (Ordovician of the United Kingdom)

Where: Wales, United Kingdom (52.9° N, 3.6° W: paleocoordinates 49.0° S, 17.9° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Dicranograptus caudatus graptolite zone, Upper Member (Gelli-grîn Formation), Woolstonian (455.8 - 452.0 Ma)

• Calcarous Ashes above Cymerig Limestone

• member-level stratigraphic resolution

Environment/lithology: marine; calcareous mudstone and blue mudstone

• Dark blue calcareous mudstones and ashy mudstones. [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 188592: authorized by Melanie Hopkins, entered by Melanie Hopkins on 08.09.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Phacopida - Pterygometopidae
Estoniops alifrons McCoy 1851 trilobite
 Phacopida - Calymenidae
? Flexicalymene cf. caractaci Salter 1865 trilobite