Ordovician Trilobite Genera T-Shirt Mosasaurus fossil Celebrate one of the most

Celebrate one of the most iconic dome-headed dinosaurs with our Pachycephalosaurus Born to Bonk T-Shirt

Its vintage

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Fossils have been found in Germany and France

vintage field-guide style rather than any specific geologic period

Ordovician Trilobite Genera T-Shirt Mosasaurus fossil Celebrate one of the mostArtist: ldn_rdnt_art The Ordovician was the final major period when trilobites greatly diversified, with very few completely new body forms appearing afterward. Most later trilobite evolution involved small changes to forms that had already developed during the Ordovician. By the time of the Ordovician mass extinction, trilobite expansion had ended, and their long decline had begun. This period represents the peak of trilobite variety in both shape