This was created by Robert Steele in the 1990's when it became apparent that top-down secrecy-based government was completely unsuited to reality and the needs for public consensus decision-making taking the long-view as advocated by Steward Brand.
The conceptualization of this chart was indirectly influenced by the works of Kirkpatrick Sale and by the Native American concept of “seventh generation” decision-making–making every decision with a profound appreciation for its implications on the seventh generation out (roughly 230 years out at the time).
Epoch B is a phrase used by someone specific that we cannot run down right now.