Dinosaurs Of The Cretaceous Period. 1000 piece puzzle. 26.5 x 19.25 inches. The Cretaceous period (144 - 65 million years ago) may have seen more dinosaurs than ever before. Over 20 of the most fascinating creatures are illustrated, such as giganotosaurus, tyrannosaurus and triceratops. This superior quality puzzle will delight and educate all at the same time. Strong high - quality pieces that won't break. Easy fit puzzle pieces. Made from recycled board.