Middle Allt Ddu Group, Caradoc, Bala District, Merionethshire (Ordovician of the United Kingdom)

Where: Wales, United Kingdom (52.9° N, 3.6° W: paleocoordinates 52.2° S, 18.4° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Allt Ddu Group, Soudleyan (458.4 - 457.2 Ma)

• "Middle Allt Ddu Group." Soudleyan in age.

• group-level stratigraphic resolution

Environment/lithology: offshore; mudstone and siltstone

• This paper pays very little attention to the lithologic descriptions, focusing instead on correlation of brachiopod faunas.
• Mudstones and siltstones with minor ashes and sandstones.

Size class: macrofossils

Primary reference: A. Williams. 1963. The Caradocian brachiopod faunas of the Bala District, Merionethshire. Bulletin of the British Museum of Natural History (Geology) 8(7):327-471 [m. patzkowsky/Z. Krug/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 43638: authorized by Mark Patzkowsky, entered by Zack Krug on 17.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Brachiopods only.
Show authors, comments, and common names
Rhynchonellata
 Orthida - Dalmanellidae
Howellites intermedia, Howellites striata
 Orthida - Harknessellidae
Reuschella cf. horderleyensis
 Rhynchonellida - Trigonirhynchiidae
Rostricellula sparsa
Strophomenata
 Strophomenida - Rafinesquinidae
"Macrocoelia prolata" = Colaptomena expansa prolata
"Macrocoelia prolata" = Colaptomena expansa prolata Williams 1963
 Strophomenida - Sowerbyellidae
"Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea
"Sowerbyella sericea" = Sowerbyella (Sowerbyella) sericea Sowerby 1839