Giving a ton of you are going to design a clock to represent the different geologic eons throughout earth's history. - research how long each eon lasted. -knowing that each hour of the clock is about 375 million years, determine how many hours each eon takes up on our 12-hour clock. for example, if an eon took 750 million years, that would take up two hours of the clock. -within each eon, identify major events and the types of life that dominated the earth during that time. how you design your clock is up to you. you can use a computer program to design your clock of eons or you can go old school and use poster board and markers.