The "Grès rouges infracénomaniens" of southern Morocco, possibly of Albian age, contain evidence of one of the most diversified dinosaur assemblages known from Africa, including a relatively long-necked species of Spinosaurus and abundant but isolated bones of a peculiar theropod ("Spinosaurus B" of Stromer 1934). Also preserved are the oldest records of abelisaurids and among the oldest records of titanosaurids in Africa. Theropods are most abundantly represented, followed by sauropods; ornithischian remains were not identified. Bones of infantile dinosaurs are present, one of which was derived from an individual weighing less than 4 kg. The assemblage resembles that of the Bahariya Formation more than that of Gadoufaoua, possibly because of a trophic dependence upon large, freshwater fishes. It was more closely linked zoogeographically to South America than to North America.
Dinosaurs, Middle Cretaceous, Morocco, Biogeography