Chuar Group
The Group is the approximate upper half of the Grand Canyon Supergroup , overlain by the thin , in comparison , Sixtymile Formation , the top member of the multi-membered Grand Canyon Supergroup . 
<triplet> Grand Canyon Supergroup <subj> Sixtymile Formation <obj> has part <triplet> Sixtymile Formation <subj> Grand Canyon Supergroup <obj> part of