El Mers Group

El Mers Group
Stratigraphic range: Bajocian–Callovian ~168–166 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Group
Sub-units	El Mers Formations 1–3
Underlies	Unconformity with Barremian or Plio-Pleistocene sediments
Overlies	Ich Timellaline–Bou Akrabene Formation
Thickness	Over 500 m (1,600 ft)
Lithology
Primary	Marl, gypsum (only in unit 3)
Other	Sandstone, limestone
Location
Coordinates	33°30′N 4°18′W / 33.5°N 4.3°W / 33.5; -4.3
Approximate paleocoordinates	28°18′N 2°00′W / 28.3°N 2.0°W / 28.3; -2.0
Region	Boulemane and Azilal Provinces
Country	Morocco
Extent	Middle Atlas
El Mers Group (Morocco)

The El Mers Group is a geological group in the Middle Atlas of Morocco. It is subdivided into three formations named the El Mers I, II, and III Formations, respectively. It is a marine deposit primarily consisting of marl, with gypsum present in the upper part of unit 3. It is the lateral equivalent of the terrestrial Guettioua Sandstone. Dinosaur remains are among the fossils that have been recovered from the group, most notably those of sauropods and the unusual thyreophorans Adratiklit, Thyreosaurus, and Spicomellus.