What are the eras longest to shortest? From longest to shortest, the segments of time are eon, era, period, and epoch. 5.
What are the 4 eras from oldest to youngest? 1 Answer. The four main ERAS are, from oldest to youngest: PreCambrian, Palaeozoic, Mesozoic and Cenozoic.
What is the youngest era? The Cenozoic is the youngest era and the name means “new life”.
Which is shorter era or period? Eras are divisions of geologic time shorter than eons but longer than periods.