| Lealt Shale Formation | |
| Type: | Geological formation |
| Period: | Bathonian |
| Prilithology: | Mudstone |
| Otherlithology: | Limestone |
| Namedfor: | Lealt, Skye |
| Region: | Europe |
| Unitof: | Great Estuarine Group |
| Subunits: | Kildonnan Member, Lonfearn Member |
| Underlies: | Valtos Sandstone Formation |
| Overlies: | Elgol Sandstone Formation |
| Thickness: | Between 45 and 50 m |
| Extent: | Inner Hebrides |
| Namedby: | Harris and Hudson |
| Year Ts: | 1980 |
| Location Ts: | Cliffs east of Lonfearn (partial), Coastal exposure 2.5 km north of Kildonnan, Eigg (partial) |
| Thickness Ts: | Lonfearn: 26 to 30 m (partial) Kildonnan: 23 m (partial) |
The Lealt Shale Formation is a Middle Jurassic geologic formation in Scotland. Fossil ornithopod, theropod and stegosaur tracks, a theropod dinosaur tooth and the pterosaur Dearc have been reported from the formation.[1] [2] [3] The lithology consists of silty fissile mudstones with subordinate thin limestones.[4]