https://stratigraphy.org/ICSchart/ChronostratChart2018-07.pdf https://figshare.com/articles/dataset/Geological_Event_Chart/8242802 Geological time unit: https://www.digitalatlasofancientlife.org/learn/geological-time/#:~:text=Similarly%2C%20one-million%20years%20is,species%20went%20extinct%2066%20Mya. https://en.wikipedia.org/wiki/Geologic_time_scale#Terminology https://stratigraphy.org/guide/defs https://www.ufsm.br/midias/arco/post466#:~:text=Para%20entender%20melhor%20sua%20história,%2C%20períodos%2C%20épocas%20e%20idades.