Dakota) Vermillion River ヴァーミリオン川 (South Dakota) Big Sioux River ビッグスー川 NiobraraRiver Platte River プラット川 Little Nemaha River Big Nemaha River Perry Creek (Iowa)
kansasensis, a new species of tylosaurine (Squamata, Mosasauridae) from the Niobrara Chalk of western Kansas, USA”. Netherlands Journal of Geosciences 84 (3):