The timeline is dependent upon the discovery of the fossils which establish the dates.
And the age of the fossils is determined by geological column, and age of the geological column is determined by the fossils, and the age of the fossils is determined by geological column, and age of the geological column is determined by the fossils, and the age of the fossils is determined by geological column, and age of the geological column is determined by the fossils, and...
No, that is not how it works. You’re using a half truth to invent and promote a falsehood. There is far more involved with dating than just the stratigraphic column.
You’re missing some fairly convincing differing methods of radiometric dating of various rock types, thus also, their sequencing within that same geologic column.