This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Michael Loewe and Edward Shaughnessy's Cambridge History of Ancient China divides Chinese antiquity into named periods, the Western Zhou, the Spring and Autumn period, the Warring States, built primarily from dynastic and political history rather than from religious change on its own, a periodization scheme genuinely different in its own logic from the dynastic and kingdom divisions used for ancient Egypt.
That difference matters for a historical period entry because it shows periodization itself is not one universal system applied everywhere, but a documented scholarly convention each historical tradition has developed on its own terms, built from whatever evidence, king lists, archaeological layers, dated inscriptions, that tradition's own historians actually have to work with.
A historical period entry therefore records which periodization scheme a given span belongs to and on what documented evidence that scheme rests, rather than assuming every civilization's history divides into periods the same way or for the same reasons a better known example does. That documented difference is also why this atlas keeps each civilization's own periodization scheme intact rather than translating every span into one shared, artificial timeline.