Grand-Auverné Formation

The Grand Auverné Formation is a geologic formation in France. It preserves fossils dating back to the Darriwilian to Sandbian (Dobrotivian in the regional stratigraphy) stages of the Ordovician period.^[1]

Grand Auverné Formation
Stratigraphic range: Darriwilian-Sandbian (Dobrotivian) ~461–457.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Formation
Sub-units	Schistes d'Angers Member
Lithology
Primary	Organic shale
Other	Sand and pyrite
Location
Coordinates	47.0°N 1.0°W / 47.0; -1.0
Approximate paleocoordinates	68.2°S 76.0°E / -68.2; 76.0
Region	Maine-et-Loire
Country	France
Grand-Auverné Formation (France) Show map of France Grand-Auverné Formation (Pays de la Loire) Show map of Pays de la Loire

Description

The formation comprises dark shales with fine laminations, fossiliferous nodules, and occasional lenticles, bioturbation, sand and pyrite.^[2]

Fossil content

The following fossils were reported from the formation:^[2][3]

Trilobites

• Basilicus sp.
• Bumastus sp.
• Colpocoryphe sp.
• Dionide sp.
• Eccoptochile sp.
• Ectillaenus sp.
• Eodalmanitina sp.
• Neseuretus sp.
• Nobiliasaphus sp.
• Ogygites sp.
• Pateraspis sp.
• Placoparia sp.
• Prionocheilus sp.
• Salterocoryphe sp.
• Selenopeltis sp.
• Uralichas sp.
• Zeliszkella sp.
• ?Onnia sp.

Graptoloidea

• Didymograptus sp.

See also

• List of fossiliferous stratigraphic units in France