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Its vintage
Celebrate one of the most iconic dome-headed dinosaurs with our Pachycephalosaurus Born to Bonk T-Shirt
vintage field-guide style rather than any specific geologic period
Wear your curiosity — and spot the ancient wherever you go
Ordovician Trilobite Genera T-Shirt Mosasaurus fossil Its vintageArtist: 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
