| Adaffa Formation | |
| Period: | Campanian |
| Age: | Campanian ~ |
| Type: | Geological formation |
| Prilithology: | Sandstone, siltstone, marl |
| Otherlithology: | Conglomerate |
| Unitof: | Suqah Group |
| Underlies: | Unconformity with Lower Miocene Al Wajh Formation |
| Overlies: | Proterozoic granite basement |
| Thickness: | Up to 200m (700feet) |
| Location: | Midyan Peninsula, Tabuk Region |
| Coordinates: | 27.3°N 35.7°W |
| Paleocoordinates: | 9.7°N 29.2°W |
| Region: | Arabian Peninsula |
The Adaffa Formation is a Geological formation in Saudi Arabia, and the lowermost unit of the Suqah Group. It dates back to the Campanian of the Late Cretaceous. The lithology consists of sandstone, siltstone and marl, with a basal granitic conglomerate with phosphatic nodules. Also present are ferricrete horizons. It was deposited in marginal marine conditions close to land. Fish,[1] marine reptile[2] and dinosaur[3] remains have been recovered from the formation.
| Fish of the Adaffa Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
| Ceratodus | Indeterminate | Toothplates | Lungfish | |||
| cf. Enchodus | Indeterminate | Teeth | ||||
| cf. Protosphyraena | Indeterminate | Teeth | Pachycormid | |||
| ?Anacoracidae | Indeterminate | Vertebrae | ||||
| Indeterminate | Vertebral centra | |||||
| Pycnodontiformes | Indeterminate | Teeth | ||||
| Crocodyliformes of the Adaffa Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
| Dyrosauridae | Indeterminate | Two vertebrae | ||||
| Crocodyliformes | Indeterminate | Cranial fragment | ||||
| Squamates of the Adaffa Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
| Prognathodon | Indeterminate | Teeth | Mosasaur | |||
| cf. Pachyvaranus | Indeterminate | Vertebrae | Aquatic varanoid | |||
| Mosasauridae | Pygal vertebra | |||||
| Plioplatecarpinae | Indeterminate | Dorsal vertebra | ||||
| Dinosaurs of the Adaffa Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
| Abelisauridae | Indeterminate | Two teeth | ||||
| Titanosauria | Indeterminate | Seven caudal vertebrae, seemingly from the same individual | ||||