Adapiformes
The fossil record of the Adapiformes is quite considerable. The fossils are first found in the earliest Eocene, 55 million years ago (mya). They lived in four continents (North America, Africa, Europe and Asia). The Eocene was when the Earth was much warmer than today, with extensive tropical forests, far more so than today. The widespread remains have a much earlier origin, and molecular clock dates suggest that primates evolved more than 80–90 mya, nearly 40 million years before appearing in the fossil record.