Camarasaurus
Its fossil remains have been found in the Morrison Formation of Colorado and Utah , dating to the Late Jurassic epoch ( Kimmeridgian to Tithonian stages ) , between 155 and 145 million years ago . 
<triplet> Morrison Formation <subj> Kimmeridgian <obj> temporal range start <triplet> Late Jurassic <subj> Kimmeridgian <obj> has part <triplet> Kimmeridgian <subj> Late Jurassic <obj> part of <triplet> Tithonian <subj> Late Jurassic <obj> part of