Kate Winslet and Saoirse Ronan star in the romantic new trailer for Francis Lee's 'Ammonite.' | Rotten Tomatoes

Fossil find of a lifetime! Heteromorph ammonites are absolutely wild, and as soon as I found this one I became totally obsessed with them. We have an impressive group of these peculiar uncoiled ammonoids which can be observed in some of the Late Cretaceous formations here in Northern California. However, I quickly found out that accessing any of these classic study areas is extremely difficult to impossible, as most are off limits after being purchased as private ranch land. The location this sp