Where: Wales, United Kingdom (52.0° N, 4.0° W: paleocoordinates 46.6° S, 17.9° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Pleurograptus linearis graptolite zone, Onny Formation (Alternata Group), Onnian (453.0 - 449.5 Ma)

• "zone of Onnia gracilis", in Siveter (1976)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size classes: macrofossils, mesofossils

Primary reference: D. J. Siveter. 1977. The Middle Ordovician of the Oslo Region, Norway, 27. Trilobites of the Family Calymenidae. Norsk Geologisk Tidsskrift 56:335-396 [B. Kröger/B. Kröger/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 167240: authorized by Björn Kröger, entered by Björn Kröger on 09.03.2015

Creative Commons license: CC BY (attribution)