Tufs et calcaires de Rosan
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TypeFormation
OtherPillow lava, claystone, sandstone
| Tufs et calcaires de Rosan | |
|---|---|
| Stratigraphic range: Katian-Hirnantian (Kralodvorian-Kosovian) ~ | |
 Geologic map of the Armorican Massif | |
| Type | Formation |
| Lithology | |
| Primary | Tuff, limestone |
| Other | Pillow lava, claystone, sandstone |
| Location | |
| Coordinates | 48°18′N 4°12′W / 48.3°N 4.2°W |
| Approximate paleocoordinates | 70°18′S 53°54′E / 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) | |
The Tufs et calcaires de Rosan (Breton: Tufoù roz ha mein-kalz) 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]