Robuta

https://www.bas.ac.uk/data/our-data/publication/late-jurassic-and-early-cretaceous-biostratigraphy-of-the-fossil-bluff-formation-alexander-islands/ Late Jurassic and Early Cretaceous biostratigraphy of the Fossil Bluff Formation, Alexander Islands... late jurassic early cretaceous of the fossil bluff alexander islands