 The Kaiparowits Formation is a muddy bed that was deposited between about 76.1 to 74.0 million years ago, in the area where the Grand Staircase-Escalante National Monument of Utah is today.It is extremely fossil rich, with thousands of plants and animal fossils being preserved in amongst its sandstone and mudstone deposits.Based on plants remains including multiple vines, leaves, and branches, It was assumed by paleontologists Scott Sampson and his colleagues that Utah in the Campanian was a dense jungle bordering the Western Interior Seaway.