Gelli-grin 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: Gelli-grin Group, Longvillian (457.5 - 455.8 Ma)

• "Gelli-grin Group." Longvillian 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 43640: authorized by Mark Patzkowsky, entered by Zack Krug on 17.08.2004, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• Brachiopods only.
Strophomenata
 Orthotetida - Triplesiidae
 Strophomenida - Sowerbyellidae
 Strophomenida - Aegiromenidae
Sericoidea sp. Lindström 1953
 Strophomenida - Leptestiidae
Leptestiina oepiki Whittington 1938
 Strophomenida - Rafinesquinidae
Leptaena ventricosa, "Macrocoelia prolata n. sp." = Colaptomena expansa prolata
Leptaena ventricosa Williams 1963
"Macrocoelia prolata n. sp." = Colaptomena expansa prolata Williams 1963
 Strophomenida - Strophomenidae
Strophomena sp., Bellimurina incommoda n. sp., "Glyptomena cf. osloensis" = Oslomena osloensis
Strophomena sp. Rafinesque and De Blainville 1824
Bellimurina incommoda n. sp. Williams 1963
"Glyptomena cf. osloensis" = Oslomena osloensis Spjeldnaes 1957
Rhynchonellata
 Protorthida - Skenidiidae
 Atrypida - Cyclospiridae
Cyclospira sp. Hall and Clarke 1893
 Orthida - Linoporellidae
Salopia sp. Williams 1955
 Orthida - Dalmanellidae
Dalmanella modica n. sp. Williams 1963
Bancroftina sp. Sinclair 1946
Onniella ostentata n. sp. Williams 1963
 Orthida - Harknessellidae
 Orthida - Orthidae
 Orthida - Productorthidae
Nicolella actoniae de Sowerby and Murchison 1839
 Orthida - Plaesiomyidae
Dinorthis berwynensis Whittington 1938
 Orthida - Hesperorthidae
 Orthida - Platystrophiidae
 Orthida - Cremnorthidae
Cremnorthis parva n. gen. n. sp.
Cremnorthis parva n. gen. n. sp. Williams 1963
 Orthida - Rhactorthidae
Rhactorthis crassa n. gen. n. sp.
Rhactorthis crassa n. gen. n. sp. Williams 1963
Lingulata
 Lingulida - Disciniidae
Orbiculoidea sp. d'Orbigny 1847
 Lingulida - Obolidae
Craniata
 Craniopsida - Craniopsidae
Paracraniops macella n. gen. n. sp.
Paracraniops macella n. gen. n. sp.
 Craniida - Craniidae