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devoniana, posterior view Atrypa devoniana, lateral view Atrypa sp.; Couvinian (Middle Devonian); El Pical, Leon, Spain. Eroded to show spiralia on the...9 KB (323 words) - 20:26, 8 May 2024
Huergas Formation alternates between red sandstone and shale and is of Couvinian to Givetian age. The Portilla formation is of coralline limestone of Givetian...98 KB (12,176 words) - 20:28, 5 November 2024- Copernicus Costonian 460.9 459 age Ordovician regional Bancroft, 1933 Couvinian 397.5 ± 2.7 391.8 ± 2.7 age Devonian Belgium (obsolete) Couvin d'Omalius...77 KB (676 words) - 12:15, 4 August 2024
1967. The sequence and distribution of Ludlovian, Lower Devonian, and Couvinian faunas in the Union of Soviet Socialist Republics. Palaeontology, 10,...59 KB (6,941 words) - 08:28, 13 September 2024
Wall were considered to belong to Assise de Bure and date from Lower Couvinian (Emsian). The revision of the geological map of Givet and recent studies...12 KB (1,381 words) - 02:04, 5 January 2022
