 However, preliminary re-calibration of late Cretaceous formation correlations suggests that the upper part of the Kaiparowits, where many of the unique species are found, is actually younger than the Dinosaur Park, and that some Kaiparowits species may in fact simply be descendants of Dinosaur Park species.According to this re-calibrated stratigraphic data, the Kaiparowits dates from about 76.6 to 74.5 million years ago.The timeline below follows the re-calibrated timeline of Fowler (2016), showing species from the Kaiparowits Formation in green, and related species from Alberta in blue.