California State Dinosaur: Augustynolophus morrisi

The Moreno Formation material now assigned to Augustynolophus was originally described as Saurolophus morrisi by paleontologist William J. Morris in 1973. Saurolophus is a genus of crested hadrosaur known from Alberta and Asia — placing the California material there seemed reasonable at the time. For four decades, the California hadrosaur was known as the 'Morris species of Saurolophus.'

In 2014, Albert Prieto-Márquez, Jonathan Erickson, and Fernando Novas reanalyzed the California material alongside new phylogenetic data. Their conclusion: the Moreno Formation hadrosaur was not Saurolophus. It had a distinct combination of anatomical features not shared by the Asian or Albertan specimens, and it warranted its own genus. They named it Augustynolophus — honoring Gretchen Augustyn, whose funding to the Natural History Museum of Los Angeles County had supported the research that made the reclassification possible.

The full species name encodes two separate histories: morrisi preserves credit for the 1973 description, and Augustynolophus records the financial support that brought the correction 41 years later. California didn't get a new dinosaur in 2014 — the bones had been sitting in collections since 1939. It got a corrected identity.

During the Maastrichtian — the final 6 million years of the Cretaceous — much of California's Central Valley region was shallow ocean. The terrestrial coastal strip where land animals could live was narrow, geologically active, and under constant pressure from marine transgression, volcanism, and faulting. These conditions make West Coast terrestrial fossil preservation fundamentally different from the continental interior, where hadrosaur bonebeds in Montana and Alberta preserve hundreds of individuals.

The Moreno Formation, exposed in the hills west of the San Joaquin Valley in Fresno and Merced Counties, is a rare exception: a Late Cretaceous coastal deposit containing both marine fossils and occasional terrestrial material that washed offshore before burial. Dinosaur carcasses drifting into marine sediment rarely stay intact — saltwater, transport, and seafloor scavengers degrade bones before they can be buried. The known Augustynolophus material reflects this: cranial fragments, vertebrae, limb bones from multiple individuals, enough to establish the animal's identity but nothing like the complete articulated skeletons from inland formations.

Augustynolophus belongs to the saurolophine hadrosaurs — the same broad group as Saurolophus from Alberta and Mongolia. Whether it represents an isolated West Coast population or part of a broader Maastrichtian dispersal southward depends on material that hasn't been found. The Moreno Formation is poorly exposed and difficult to survey; what exists in collections is what scattered decades of fieldwork happened to produce.

The legislative campaign was driven by students at Castaic Union School District, working with teachers and a local paleontologist. They identified Augustynolophus as the candidate, built the scientific case, and lobbied Senate Bill 1540 through the California legislature. The Natural History Museum of Los Angeles County — which holds the primary Augustynolophus research collection — supported the effort as institutional partner.

The choice of Augustynolophus was not a close call. It is the only formally described dinosaur species from California's nonmarine Cretaceous deposits. California has other fragmentary dinosaur material, but none with the scientific documentation that Augustynolophus has. There was no alternative candidate.