Riochican
The Riochican age is a period of geologic time ( 57 . 0–54 . 0 Ma ) within the Paleocene and Eocene epochs of the Paleogene , used more specifically within the South American land mammal ages ( SALMA ) . 
<triplet> Paleocene <subj> Paleogene <obj> part of <triplet> Eocene <subj> Paleogene <obj> part of <triplet> Paleogene <subj> Paleocene <obj> has part <subj> Eocene <obj> has part <triplet> South American land mammal age <subj> geologic time <obj> instance of