Gastonia

Replica Fossil - Early Cretaceous 125 - 120 Mya - Western North America
A slow plant-eater that weighed less than a ton, Gastonia relied on its armor to ward off predators. Its body was low to the ground, with large spikes protecting its flanks. These methods helped Gastonia thrive in the Cretaceous Period - it certainly didn't rely on its intelligence, as its brain was only the size of a golf ball.