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35% Oxygen Arthropleura T-ShirtThis vintage, distressed design highlights Arthropleura, the colossal millipede like arthropod that thrived in the Carboniferous Period, when atmospheric oxygen levels soared to around 35%. Rendered in detailed white linework against a deep black backdrop, the shirt blends natural history accuracy with bold paleo humor for an eye catching retro aesthetic. Made from 100% ring spun cotton (high quality cotton) with a soft, sensory friendly feel. Every

a small but speedy dinosaur from the Late Cretaceous period

vintage Japanese art enthusiasts

this design carries the timeless feel of natural history illustrations

greenhouse world with expanding terrestrial ecosystem

Made with astronomy enthusiasts in mind

lightly distressed crewneck showcases the Cretaceous Period through a bold collage of fossil elements

vintage-style crewneck features Compsognathus

and anyone who admires the majesty of Africa’s mammals

linocut-style tribute to the Cretaceous finale

and made to last

The playful “TYPE SHI” typography adds an enigmatic

This bold design features a distressed