Tufs et calcaires de Rosan

The Tufs et calcaires de Rosan is a geologic formation in France. It preserves fossils dating back to the Katian to Hirnantian (Kralodvorian to Kosovian in the regional stratigraphy) stages of the Late Ordovician period.

Fossil content
The formation has provided fossils of:

Strophomenata

 * Hedstroemina sp.
 * Iberomena sp.
 * Leptaena sp.
 * Leptestiina sp.

Rhynchonellata

 * Porambonites sp.
 * Eoanastrophia sp.
 * Rostricellula sp.
 * ?Dalmanella sp.
 * Bancroftina sp.
 * Nicolella sp.
 * Retrorsirostra sp.
 * Ptychopleurella sp.
 * Dolerorthis sp.
 * Mcewanella sp.
 * Aberia sp.
 * ?Rhactorthis sp.