Late Jurassic
The Late Jurassic is the third epoch of the Jurassic period , and it spans the geologic time from 163 . 5 ± 1 . 0 to 145 . 0 ± 0 . 8 million years ago ( Ma ) , which is preserved in Upper Jurassic strata . 
<triplet> Late Jurassic <subj> epoch <obj> instance of <triplet> epoch <subj> period <obj> part of <triplet> Jurassic <subj> Late Jurassic <obj> has part <subj> period <obj> instance of <triplet> period <subj> epoch <obj> has part