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Thalassomedon Sea Lord T-ShirtThis vintage style t shirt features Thalassomedon, the massive plesiosaur that ruled the seas of the Late Cretaceous, about 95 million years ago. The design showcases the marine reptile in earthy green tones, framed by ornate golden scrollwork and distressed typography for a retro natural history aesthetic. Made from 100% ring spun cotton (high quality cotton) with a soft, sensory friendly feel. Every shirt purchased plants a tree, and the material is

linocut-style design featuring a defiant Spinosaurus raising its scientifically accurate three-fingered claws beneath a crescent moon

and environmental stewardship

where science and art intertwined

symbolizing the wonder of Earth’s deep past

expressive rain lines

this playful paleoart captures the spiked defense of Ankylosaurus as it delivers a tail-club justice strike to a curious T

so you’re not only getting a laugh but also giving back to the planet

and climate

one of the most iconic herbivores of the Late Cretaceous period (about 68–66 million years ago)

This humorous shirt reimagines one of Earth’s most pivotal evolutionary moments: the first vertebrate steps onto land

The soft orange and charcoal palette evokes mid-century field guides and educational posters

Step into the deep past with this vivid Permian period t-shirt design