Stages may pertain-to a late cretaceous period.Logical formLearned from5 sentences. A greensand can be cretaceous.Logical formLearned from5 sentences. A (rock formation) can be cretaceous.Logical formLearned from5 sentences. A level can be cretaceous.Logical formLearned from5 sentences. Turbidites can be cretaceous.Logical formLearned from5 sentences. (Chalk uplands) can be cretaceous.Logical formLearned from5 sentences. Plesiosaurs can be cretaceous.Logical formLearned from5 sentences. Ostracods can be cretaceous.Logical formLearned from5 sentences. Marine sediments can be cretaceous.Logical formLearned from5 sentences. A boundary can be between a cretaceous period.Logical formLearned from5 sentences. Strata can be constituted-of-or-filled-with cretaceous age.Logical formLearned from5 sentences. Ancestors can be cretaceous.Logical formLearned from5 sentences. (Carbonate rocks) can be cretaceous.Logical formLearned from5 sentences. A foraminifera can be cretaceous.Logical formLearned from5 sentences. An objective can be cretaceous.Logical formLearned from5 sentences.