Reality Check: Megafauna and Dinosaurs

Could a planet support both large mammalian megafauna and non-avian dinosaurs at the same time? My worry is that bigger mammals have progressively more trouble with dissipating body heat, whereas large dinosaurs were generally cold-blooded, meaning they didn't have as much trouble. (I'm no expert so if megafauna got along fine in very hot temperatures, or vice versa for dinosaurs please feel free to correct me.)

Thinking of making a world with slightly less of a tilt than Earth's, about .7g and an atmospheric composition similar to Jurassic times (avg. Temp=300K).

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Reality Check: Megafauna and Dinosaurs

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