The Canyon Range Conglomerate is composed of large rounded Paleozoic Rocks which came off very high mountains to our west, during late Cretaceous times. It’s the size of these rocks which tell geologists that there was significant elevation difference between where they originated and here where they ended up. After about 40 million years most of that high range had eroded away, because the overlying North Horn and then Flagstaff Formations show progressively finer erosion products. By the Eocene you have clay and near sea-level conditions.