We often think of those who have shaped our past and found many of the firsts of their region as living in ancient history, but José left us just this past year in February.
He was a prolific and hard-working Argentinian palaeontologist who you'll know as the discoverer of some of Argentina's iconic dinosaurs — Carnotaurus, along with Amargasaurus, Abelisaurus, Argentinosaurus and Noasaurus.
His first love was mammals and over the course of his career, he unearthed the remains of some of the first South American fossil mammals from the Mesozoic.
Between 1975 and 1977, Bonaparte worked on excavation of the Saltasaurus dinosaur with Martín Vince and Juan C. Leal at the Estancia "El Brete." Bonaparte was interested in the anatomy of Saltasaurus, particularly the armoured plates or osteoderms embedded in its skin.
Based on this discovery, together with twenty examples of Kritosaurus australis and a lambeosaurine dinosaur found in South America, Bonaparte hypothesized that there had been a large-scale migration of species between the Americas at the end of the Mesozoic period.
The supercontinent of Pangea split into Laurasia in the north and Gondwana in the south during the Jurassic. During the Cretaceous, South America pulled away from the rest of Gondwana. The division caused a divergence between the northern biota and the southern biota, and the southern animals appear strange to those used to the more northerly fauna.
Bonaparte's finds illustrate this divergence. His work is honoured in his moniker given to him by palaeontologist Robert Bakker — "Master of the Mesozoic."
If you fancy a listen, he is the honoured guest in absentia on an episode of the Fossil Huntress Podcast. You can find the link here to listen: https://anchor.fm/.../Jos-Bonaparte-Master-of-the...
