The general time frame in which various species arose in their infancy. While early proto-civilizations were forming, they notably had to contest natural land with the Relentless frequently. This greatly hampered the ability of these young civilizations to prosper, leading many to form, rise up, then die out in fairly quick succession. It is most notable as, at some point in this extremely wide span of time, the Great Convergence itself is theorized to have occurred. There are those who contest this naming and viewpoint, however. Their chief argument revolves around the finding of ruined civilizations far, far older than this era of time would imply.