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.[1]
| Tufs et calcaires de Rosan Stratigraphic range: Katian-Hirnantian (Kralodvorian-Kosovian) ~450–443.7 Ma | |
|---|---|
 Geologic map of the Armorican Massif | |
| Type | Formation |
| Lithology | |
| Primary | Tuff, limestone |
| Other | Pillow lava, claystone, sandstone |
| Location | |
| Coordinates | 48.3°N 4.2°W |
| Approximate paleocoordinates | 70.3°S 53.9°E |
| Region | Finistère |
| Country |  France |
| Extent | Armorican Massif |
| Type section | |
| Named for | Rosan |
  Tufs et calcaires de Rosan (France)  Tufs et calcaires de Rosan (Brittany) | |
Fossil content
The formation has provided fossils of:[1][2]
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.
References
- Tufs et calcaires de Rosan at Fossilworks.org
- Melou, 1990
Bibliography
- M. Melou. 1990. Brachiopodes articules de la coupe de l'ile de Rosan (Crozon, Finistere); formation des tufs et calcaires de Rosan (Caradoc-Ashgill). Géobios 23(5):539-579
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