One that I remembered recently is the late 80s to early 90s had a period of time where "caveman" or general "pre-history" games were suddenly a thing for a good while. Joe and Mac, Adventure Island, Prehistorik 1 and 2, the Chuck Rock series, Adventures of Dino Riki, Big Nose the Caveman, the Bonk series, The Flintstones saw a good handful of games during this period, and hell if I may stretch things the JRPGs Chrono Trigger and Live A Live both had pre-history settings with cavemen characters.
While a surge in "dinosaur" games could be easily attributed to the popularity of Jurassic Park in the 90s, that doesn't explain why all of a sudden in the late 80s a bunch of game studios suddenly decided "you know what? Lets make a game about cavemen" and said trend lasted until the 16-bit era ended.