 This was because the fossil, having been collected from an outcrop of the Deseado Formation, was thought to be similar to other penguin fossils Ameghino attributed to the same formation.The Deseado Formation preserved a terrestrial environment, and thus the presence of penguins was considered highly unusual.The placement of "Cruschedula" as a penguin was not challenged until 1946 by eminent paleontologist George Gaylord Simpson.