Surface of the Climate Organisms Present Firsts? Trial Extinctions? yes Time Period Earth/Atmosphere (include ice Other (plants/animals) evolved or no (gases) ages here) Cretaceous 65.5-144 MYA Tertiary 1.6-65.5 MYA Quaternary 1.6 MYA - present Geological Time Scale Summary Notes Climate:
Time Period Surface of the Earth/Atmosphere (gases) Climate (include ice ages here) Organisms Present (plants/animals) Firsts? evolved Extinctions? yes or no Other Cretaceous 65.5-144 MYA Tertiary 1.6-65.5 MYA Quaternary 1.6 MYA - present Geological Time Scale Summary Notes Climate: Trial
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