Demon Dinosaurs, also known as Dino Racer, was a bizarre racing game similar to Outrun in development by Codemasters around 1994 for the Sega Genesis / Mega Drive. Bizarre I said because it was set in prehistorik age and the racers were cave men and dinosaurs. It is unknown why the game was never released.
Thanks to Youloute for the Mega Force article. Scan from Mega Console issue 6 and Mega Force issue 29.