In the Geologic Time Scale, time is generally divided on the basis of the earth's biotic composition, with the Phanerozoic Eon (i.e.
the Paleozoic, Mesozoic and Cenozoic Eras) representing the period of Earth's history with advanced life forms, and the Pre Cambrian (or Proterozoic and Hadean Eras) representing the period before advanced life.
The use of BCE/CE certainly has become more common in recent years but it is not a new invention of the "politically correct" nor is it even all that new; the use of "common era" in place of A. first appears in German in the 17th century CE and in English in the 18th.
Some people date because they’re afraid to be alone.
Some people date because they want to see what’s out there – a bit like experimenting.
Within the context of the Phanerozoic Eon, geologists beginning in the late 1700's recognized that fossils appeared in an orderly fashion in stratigraphic units.
Moreover, these geologists recognized that the fossilized biota demonstrated rather large changes in overall composition and showed both similarities with, and differences from living taxonomic groups.
I’ve been in enough pseudo, illusionary relationships to know that I have sometimes made assumptions about the state of play and engaged in behaviour that was counterproductive to me actually forging a healthy relationship with a chance of growing.