Slopes S of Llechwedd Erwent (Ordovician of the United Kingdom)

Also known as locality 28

Where: Wales, United Kingdom (52.9° N, 3.8° W: paleocoordinates 68.0° S, 17.9° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Tetragraptus phyllograptoides graptolite zone, Henllan Ash Member (Carnedd Iago Formation), Moridunian (477.7 - 473.8 Ma)

• "Henllan Ash Member, Carnedd Iago Formation. Moridunian Stage, Arenig Series, phyllograptoides Biozone." The Henllan Ash is identical to the Erwent and Ogygia Limestones of Fearnsides (1905) (Evans, 2005).

• formation-level stratigraphic resolution

Environment/lithology: coastal; argillaceous, calcareous sandstone

• "The massive jointed occasionally fracture cleaved sandstone, which commonly contains mudstone pellets, is grey and calcareous and has a characteristic 10 mm cream-weathering layer. Current bedding is sporadic. The entire rock was feldspathic and is now highly altered. The feldspar clasts are 0.25 to 0.75 mm and sub-rounded." (Lynas, 1973, J. Geol. Soc. Lond. 129(5)). This description refers to localities W and SW of Ffestiniog, about 5-10 km to the NNW.

Size class: macrofossils

Reposited in the SM

Primary reference: D. H. Evans. 2005. The Lower and Middle Ordovician cephalopod faunas of England and Wales. Monograph of the Palaeontographical Society 623:1-81 [B. Kröger/B. Kröger/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89425: authorized by Björn Kröger, entered by Torsten Liebrecht on 19.05.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Orthocerida - Baltoceratidae
Castelloceras arennigense
Castelloceras arennigense Evans 2005
SM A.45314 to 4531416 (identified as Orthoceras encrinale by Fearnsides, 1905)