Step 1: Recall the everyday phrase epoch-making, which describes an event so important that it starts a new era.
Step 2: Eliminate the weaker options first. Neutral has nothing to do with time, so it is out. Early only refers to timing, not significance.
Step 3: Between Time Point and Turning Point, Time Point ignores the weight of importance that epoch carries, while Turning Point keeps that sense of a defining, significant moment.
\[\boxed{\text{Turning Point}}\]