Anything he wanted. Nice fat sauropods, mostly grass-eaters.Brontosaurs, Plesiosaurs.
Edit: Not really Brontosaurus in the Jurassic period and Plesiosaurs lived in the Jurassic period and lived underwater. Tyrannosauruses diet consisted mostly of Triceratops and other large Herbivores of the Cretaceous as well as oddly enough other Tyrannosaurus Rex's.
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T-rex's eat meat
But there not as bad as people think they are they only eat meat that is already dead.
They did however, eat small dino's and birds but not the large dino's.
:. They are Meat eaters