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
Geological period example the 'Jurassic System' of rocks was formed during the 'Jurassic Period' (between 201 and 145 million years ago). The following table includes all currently recognized periods. The table omits the time before 2500 million years ago, which is not divided into periods. See Geologic time scale#Proposed Precambrian timeline for another set of periods 4600–541 MYA. In a steady effort ongoing since 1974, the International Commission on Stratigraphy has been working to correlate the world's local stratigraphic record into one uniform planet-wide benchmarked system. American geologists have long considered the Mississippian and Pennsylvanian to be periods in their own right