A formation may date from stages of a late cretaceous period.Logical formLearned from2 sentences. (Period rocks) can be cretaceous.Logical formLearned from2 sentences. A habitat can be cretaceous.Logical formLearned from2 sentences. Sauropods can be cretaceous.Logical formLearned from2 sentences. Sedimentary rocks can be from a cretaceous period.Logical formLearned from2 sentences. (Period sediments) can be cretaceous.Logical formLearned from2 sentences. An island can be cretaceous.Logical formLearned from2 sentences. Rosids may be knowned from a cretaceous period.Logical formLearned from2 sentences. Materials can be cretaceous.Logical formLearned from2 sentences. Fish can be cretaceous.Logical formLearned from2 sentences. (Time periods) can be cretaceous.Logical formLearned from2 sentences. Ceratopsians can be cretaceous.Logical formLearned from2 sentences. An outcrop can be cretaceous.Logical formLearned from2 sentences. An equivalent can be cretaceous.Logical formLearned from2 sentences. Ages may pertain-to a late cretaceous period.Logical formLearned from2 sentences.