One hundred and forty million
years ago two full-fledged reptiles suddenly appeared, from which
sprang crocodiles, sea serpents, flying reptiles, and dinosaurs. Early
dinosaurs were egg layers and had very small brains. Several million
years later the first mammal appeared and quickly failed.
One hundred and twenty million
years ago dinosaurs of all sizes had evolved. The larger dinosaurs
required so much food that they starved themselves into extinction.
One hundred and ten million
years ago sea urchins mutated into existence. Crabs and lobsters
matured, and fish continued to develop. Sea serpents infested the seas
and threatened the destruction of all fishes.
Ninety million years ago
angiosperms, fig trees, tulip trees, and magnolias came into existence,
followed by breadfruit trees and palms.
Sixty-five million years
ago plant life evolved greatly with the appearance of modern-day
trees such as beech, birch, oak, walnut, sycamore, maple and modern
palms. Fruits, grasses, and cereals were widespread. These seed-bearing
plants were second in evolutionary importance only to the appearance
of man himself. Flowering plants mutated and spread all over the world.
Sixty million years ago
land turtles measured twenty feet across. Modern‑type crocodiles
and snakes thrived.
Fifty-five million years
ago the ancestor of all bird life, a small pigeon-like creature,
suddenly appeared. It was the third type of flying creature to appear
on Urantia; it sprang directly from the reptilian group. This period
marked the end of the continental drift and the buildup of modern mountains.
Fern forests were largely replaced by pines and redwoods. By the end
of this period, the biologic stage was set for the early ancestors of
mammalian types.