Back in the '90s (if memoory serves) there was a game called T-rex.I recall the theme and mechanics but not the publisher, it had a comic book-like cover and size. The idea was you are a big game hunter that goes back in time to compete against other hunters to shoot and bring back dinosaurs. The dinos moved by automatic rules printed on charts. The volcano seeping lava acted as a timer and destroyed bits of the landscape as the game went on. We played this game to death when we could not get enough to do anything else. I could make my own version it but I would like to see if it is still out there...I think of these things when it rains all day and no one is available for gaming.