The Magic School Bus In the Time of the Dinosaurs software adaptation (The Magic School Bus Explores in the Age of Dinosaurs), unlike the book (The Magic School Bus In the Time of the Dinosaurs) and the TV episode (The Busasaurus) adapted from the book version, the Bus however transforms into three different prehistoric animals (one for each of the time periods) instead of a time machine. It transforms into three different prehistoric animals; a Coelophysis (for the Triassic Period), Stegosaurus (for the Jurassic Period), and Pteranodon (for the Cretaceous Period). This game has very elaborate CGI forms for the bus. Although the classroom location song has changed in the
Cretaceous local subdivisions are still in use. As with other older geologic periods, the rock beds of the Cretaceous are well identified but the exact age of the system's base is uncertain by a few million years. No great extinction or burst of diversity separates the Cretaceous from the Jurassic. However, the top of the system is sharply defined, being placed at an iridium-rich layer found worldwide that is believed to be associated with the Chicxulub impact crater, with its boundaries circumscribing parts of the Yucatán Peninsula and into the Gulf of Mexico. This layer has been dated at 66.043 Ma.