Also known as Gilwern Hill; Builth-Llandrindod inlier

Where: Wales, United Kingdom (52.2° N, 3.3° W: paleocoordinates 58.7° S, 18.7° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Didymograptus murchisoni graptolite zone, Builth Volcanic Formation, Abereiddian (468.0 - 461.1 Ma)

• These beds were said to be coeval with the Ffairfach group which has its type section about 60 km to the southwest (Williams et al., 1981, Palaeontology 24(4)). The term Ffairfach Group now is obsolete according to the British Gelological Survey Lexicon of Named Rock Units (http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=FFA). Evans (2005) states that the locality is in the D. murchisoni Biozone of the Builth Volcanic Fm. and is Abereiddian in age. The term Builth Volcanic Fm. is obsolete as well, according to the BGS Lexicon of Named Rock Units (http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=BUV).

• formation-level stratigraphic resolution

Environment/lithology: marginal marine; sandstone and ash

Size class: macrofossils

Preservation: cast

Reposited in the BMNH

Primary reference: D. H. Evans. 1994. Siphonal and cameral deposits in Allumettoceras and the position of the Tripteroceratidae (Nautiloidea). Palaeontologische Zeitschrift 68(3/4):321-337 [B. Kröger/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89280: authorized by Björn Kröger, entered by Torsten Liebrecht on 13.05.2009

Creative Commons license: CC BY (attribution)