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.

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Adaffa Formation
Stratigraphic range: Campanian ~72 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Unit of	Suqah Group
Underlies	Unconformity with Lower Miocene Al Wajh Formation
Overlies	Proterozoic granite basement
Thickness	Up to 200 m (660 ft)
Lithology
Primary	Sandstone, siltstone, marl
Other	Conglomerate
Location
Location	Midyan Peninsula, Tabuk Region
Coordinates	27.3°N 35.7°E / 27.3; 35.7
Approximate paleocoordinates	9.7°N 29.2°E / 9.7; 29.2
Region	Arabian Peninsula
Country	Saudi Arabia
Adaffa Formation (Saudi Arabia)

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