| Aye Formation | |
| Period: | Famennian |
| Type: | Geological formation |
| Prilithology: | Shales and siltstones |
| Otherlithology: | Sandstone |
| Unitof: | Condroz Group |
| Location: | Dinant synclinorium, Ardennes, Belgium |
The Aye Formation is a geologic formation in the Dinant synclinorium, Ardennes, Belgium. It is part of the Condroz Group,[1] at the base of the middle Famennian (Upper Devonian). It is characterized by the presence of a conodont fossil Palmatolepis rhomboidea.[2]
It is composed mostly of greenish shales and siltstones with some lenses of sandstone. As it formed in an offshore position, in a subtidal wave-influenced environment, bioturbation features are significant. Cross-bedding structures also occur.
The stratotype is located in the area of Houyet and Aye in Belgium.