  The external galactic key factor for developing of massive geochronological
boundaries, as well as mass extinctions (ME) is proved based on chronological
relationships of the impulses of globally short processes. External galactic
key factor is also proved based on the coincidence of the scales of their
developing processes, their regular periodicity in the formation of the
boundaries of the Phanerozoic epochs and the presence of a unifying complex of
cause-effect relationships for boundary processes. The hypotheses of the impact
origin of ocean basins and plumes are substantiated, the assumptions about the
unsteady nature of the Spiral Arms and the rotational acceleration of the Milky
Ways core are confirmed.
