Wiktionary
periodize
vb. 1 To divide history into periods 2 (context weightlifting English) To split (a training program) into segments of a few weeks or months, so that training begins at lower intensity and is gradually increased to high-intensity.
Usage examples of "periodize".
Indeed, we periodize ages in humanity's prehistory by such defining technologies - stone age, bronze age, iron age.
If you track the important writers of science fiction by mini-generations marked by the decades, a process that works much better than it should to periodize the history of the genre, then what is significant about the generation of the 1950s is that almost every one of their careers was deformed or shattered in one way or another.