New Mexico Museum of Natural History and Science

 

Triassic Ammonites and Amphibians




The fossils in this case show animals that nearly disappeared during the extinctions that ended the Triassic Period. The shovel-headed amphibians on the right had been among the most common land animals for many millions of years, but only a few species made it past the end of the Triassic. The panel on the left shows a sampling of the great diversity of Triassic ammonites, spiral-shelled relatives of today's octopus and squid. Despite their successes, only the smooth-shelled Psiloceras (sill-OSE-er-us), alone at the top of the panel, survived into the Jurassic Period.