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.

Description
The formation comprises dark shales with fine laminations, fossiliferous nodules, and occasional lenticles, bioturbation, sand and pyrite.

Fossil content
The following fossils were reported from the formation:

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.