Scientists have known there was a rapid radiation of these plants around this time, and there is fossil evidence of the plants’ flowers from 100 million and 94 million years ago. The researchers’ timing model suggests an initial radiation around 93 million to 115 million years ago followed by two more bursts between 83 million and 107 million years ago. A major radiation of amphibians, many of which live in forests today, is thought to date to 80 million to 85 million years ago, as does a major fern radiation.