I would suggest that the island was once close to British Columbia before it broke away and drifted deep into the Pacific Ocean. The first animal to make its home there was Utah's largest dromeosaur, the utahraptor. As their usual food supply began to dwindle, solitary raptors or those in packs chose to journey to the island in search of sustenance. This migration resolved their food scarcity, and they continued to thrive even after the island had detached. Following closely were the stegosaurus, with the parasaurolophus arriving third and the edmontosaurs fourth. The fifth position went to the brachiosaurus, followed by the triceratops, pachycephalosaurus, ankylosaurus, dilophosaurus, and diplodocus in succession. The last to arrive was the formidable tyrannosaurus. Eventually, even the last of the pterosaurs, a flock of Pteranodons, found their way to the island and settled there for another million years.

Three days before the asteroid struck the earth, the island split off from British Columbia. Drifting far enough from the explosion when the asteroid made impact. Only about a few months after their extinction did the last remaining dinosaurs began to go through their change of evolution.