Moel Llyfnant, NE slopes (Ordovician of the United Kingdom)

Also known as locality 29

Where: Wales, United Kingdom (52.9° N, 3.8° W: paleocoordinates 67.9° S, 17.9° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Tetragraptus phyllograptoides graptolite zone, Henllan Ash Member (Carnedd Iago Formation), Moridunian (478.6 - 471.8 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 NW.

Size class: macrofossils

Collection methods: NMW = National Museums and Galleries of Wales

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 89424: authorized by Björn Kröger, entered by Torsten Liebrecht on 19.05.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Orthocerida - Baltoceratidae
Castelloceras arennigense Evans 2005
NMW 2001.7G.68, 2001.7G.69