In the geologic timescale used by our author,the sequence of eons and eras beginning with the earliest era and proceeding forward to the most recent era is

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The correct sequence of eons and eras in the geologic timescale used by the author is Archean, Proterozoic, Paleozoic, Mesozoic, Cenozoic. This order represents the chronological development of life on Earth, starting with the earliest life forms in the Archean eon and ending with the current era, the Cenozoic, which began 66 million years ago. The Paleozoic and Mesozoic eras are separated by the largest mass extinction event in Earth's history, marking the end of the Paleozoic era and the beginning of the Mesozoic era.

In the Geologic Timescale Used by Our Author,the Sequence of Eons