KnowraNiobrara FormationLinked fromLinked fromThe 7 pages that link to Niobrara Formation, each with the reason it gives.All 7Broader topic 4Related 3Western Interior SeawayBroader topic: Its rocks preserve organisms from the seaway’s open-water ecosystems.ChalkBroader topic: It is a major North American example of chalk-bearing marine strata.KansasBroader topic: Its chalk cliffs and fossil-rich layers are among Kansas's best-known geological features.IchthyornisBroader topic: Its deposits yielded important Ichthyornis fossils.