Welcome to my website! On this website you will be learning about the Precambrian Era, The Paleozoic Era, The Mesozoic Era and The Cenozoic Era. The Geologic Time Scale is a record of the life forms and geologic events in Earths history. The Law Of Superstition is about how older rocks are on the bottom and the newer rocks are on the top. Fossils that are found and recorded help to put together a timeline which enables us to see what existed in which period of time. Scientists can tell when an Era stops and another Era begins when certain forms become extinct and new forms start to appear.