Loire-Atlantique, Ille-et-Vilaine, and Manche (Ordovician of France)

Also known as Gres Armoricain Superieur Fm., France

Where: Loire-Atlantique, Ille-et-Vilaine, and Manche, France (48.0° N, 1.0° W: paleocoordinates 63.7° S, 84.3° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Superieur Member (Grès Armoricain 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: J. L. Henry. 1971. Les trilobites Asaphidae et Eohomalonotidae du gres armoricain superieur (?Arenigien) de l'ouest de la France. Memoires du B.R.G.M. 73:65-77 [A. Miller/P. Novack-Gottshall/P. Novack-Gottshall]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 20864: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 11.06.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Primarily bivalve and trilobite taxonomy and biostrat.
Show authors, comments, and common names
Bivalvia
 Solemyida - Ctenodontidae
Ctenodonta sp.
Ctenodonta sp. Salter 1852 clam
 Actinodontida - Cycloconchidae
Actinodonta sp.
Actinodonta sp. Philipps 1848 clam
Trilobita
 Asaphida - Asaphidae
Ogyginus sp.
Ogyginus sp. Raymond 1912 trilobite
 Phacopida - Homalonotidae
Platycoryphe sp.
Platycoryphe sp. Foerste 1919 trilobite