Geologic Time Scales
Dating from 146-65mya, the Cretaceous Period saw the development of Angiosperms, the flowering plants. Most gymnosperms forsaken their softer leaves and seeds for harder dermises to reduce the damage done by the herbivorous dinosaurs. This change left a niche opened for a fast growing weed that produced tons of seeds, the first flowers. As the angiosperm evolved, another group of animals linked their future to the flowers, the insects.