 The Kirkwood Formation is in South Africa , and many fossils of different species and genera have been discovered in it , with Paranthodon being the first uncovered . The formation is of a Late Jurassic to Early Cretaceous age , with the oldest deposits from the Tithonian , about 145 @.@ 5 million years ago , and the youngest rocks being from the Valanginian , about 136 @.@ 4 million years ago . A large variety of different animal groups have been found in the formation , including dinosaurs , at least two different <unk> lizards , multiple <unk> fishes , a few <unk> , some frog specimens , and also <unk> . However , a large amount of the material of the Kirkwood formation only includes isolated teeth or partial and fragmentary pieces of bone . Dinosaurs of the formation include a basal tetanuran and the primitive <unk> <unk> , the possible <unk> <unk> and a potential <unk> , and many ornithischians , Paranthodon , a genus of <unk> , and a " <unk> " ( the family <unk> is no longer considered to be a natural grouping ) . 
