Marnes d'Auzas Formation
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| Marnes d'Auzas Formation | |
|---|---|
| Stratigraphic range: Late Cretaceous (Late Maastrichtian) ~ | |
| Type | Geological formation |
| Underlies | Aurignac Formation |
| Overlies | Jadet Calcarenites Formation |
| Thickness | About 100 m |
| Lithology | |
| Primary | Marls |
| Other | Sandstones |
| Location | |
| Coordinates | 43°25′N 1°30′E |
| Region | Europe |
| Country | France |
  Marnes d'Auzas Formation (France) | |
The Marnes d'Auzas Formation (Auzas Marls Formation) is a geological Formation in southwestern France (departments of Ariège and Haute-Garonne) whose strata date back to the Late Maastrichtian.[1] It is about 100 metres thick and consists primarily of marls with some interbeds of sandstones.[1] It corresponds to sediments whose depositional environment evolved from the paralic domain (coastal lagoons, tidal marsh, tidal muddy channel) at the base of the formation, towards a more continental domain (alluvial plain, fluvial channels) in its upper part.[1] The Marnes d'Auzas Formation was deposited in the west coast of the former Ibero-Armorican Island, which included much of France and Spain.[2]