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Name Date Major Divisions of Geologic Time Use the chart below to figure out how long each part of your time line should be on your register tape timeline. 4,500mya/90cm = 50mya. Therefore, one centimeter = 50mya You will also have several other events to add which your teacher will give to you. Then answer the Analysis Question below the table once you have completed your timeline. Column A Geologic Name Time span (million years ago…mya) Subtract the second number from the first to get Column B Early Pre-Cambrian (Time Card B) 4,500 – 3,800 Late Pre-Cambrian (F) 3,800 – 550 Early Paleozoic (D) 550 – 408 Late Paleozoic (C) 408 – 245 Mesozoic (A) 245 – 65 Cenozoic (E) Column B Column C Length of this time span Length of this time (millions of years) span on timeline (cm) B / 50 = C 700 my 700/50 = 14cm 65 – 0 (present) AQ2: The total length of your timeline of Earth’s history is 90 cm. Use your timeline to determine the percentage of Earth’s history that: Formula is… (length of time/50)/90 = a. single-celled organisms have lived on our planet. _______ % of Earth's history b. multicellular organisms have lived on our planet. ©2009 The Regents of the University of California _______ % of Earth's history