Bumbanian
This zone lies within the Ypresian stage of the Eocene series . 
<triplet> Ypresian <subj> stage <obj> instance of <subj> Eocene <obj> part of <triplet> stage <subj> series <obj> part of <triplet> Eocene <subj> series <obj> instance of <triplet> series <subj> stage <obj> has part