Earth:Tufs et calcaires de Rosan

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Tufs et calcaires de Rosan
Stratigraphic range: Katian-Hirnantian (Kralodvorian-Kosovian)
~450–443.7 Ma
Geologic map Armorican Massif EN.svg
Geologic map of the Armorican Massif
TypeFormation
Lithology
PrimaryTuff, limestone
OtherPillow lava, claystone, sandstone
Location
Coordinates [ ⚑ ] : 48°18′N 4°12′W / 48.3°N 4.2°W / 48.3; -4.2
Paleocoordinates [ ⚑ ] 70°18′S 53°54′E / 70.3°S 53.9°E / -70.3; 53.9
RegionFinistère
Country France
ExtentArmorican Massif
Type section
Named forRosan
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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]

Fossil content

The formation has provided fossils of:[1][2]

Strophomenata


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.


See also

  • List of fossiliferous stratigraphic units in France

References

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