Gres Armoricain Superieur Fm., Ille-et-Vilaine, France (Ordovician of France)

Where: Ille-et-Vilaine, France (48.0° N, 2.0° W: paleocoordinates 64.2° S, 83.3° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Gres Armoricain Superieur Formation, Arenig (478.6 - 466.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified sandstone and lithified shale

• Sandstone occasionally intercalated with shale

Size class: macrofossils

Primary reference: C. Babin. 1966. Mollusques bivalves et céphalopodes du Paléozoïque Armoricain. Étudé systématique. Essai sur la phylogénie des bivalves. Esquisse paléoécologique. Imprimerie Commerciale et Administrative. Brest 1-471 [A. Miller/P. Novack-Gottshall/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 20852: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 11.06.2002, edited by Austin Hendy

Creative Commons license: CC BY (attribution)

Taxonomic list

• Bivalve taxonomy and biostratigraphy
Bivalvia indet. Linnaeus 1758 clam
 Cardiidia - Grammysiidae
Actinodonta sp. Philipps 1848 clam
 Modiomorphida - Modiomorphidae
Modiolopsis sp. Hall 1847 clam
? Hippomya sp. Salter 1864 clam
Redonia sp. Rouault 1851 clam
 Unioni - Lyrodesmatidae
Lyrodesma sp. Conrad 1841 clam
 Protobranchia -
Nuculites sp., "Synek sp." = Palaeoneilo
Nuculites sp. Conrad 1841 clam
"Synek sp." = Palaeoneilo Hall and Whitfield 1869 clam
 Protobranchia - Nuculanidae
"? Leda sp." = Nuculana
"? Leda sp." = Nuculana Link 1807 pointed nut clam