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.