Solar Nebula
Circumstellar Disks
Planetesimals
Terrestrial Planets (Inner Solar System)
Gas Giants (Outer Solar System)
Solar Nebula Disperses
Asteroids
Comets
Kuiper Belt
Planetary Layers
Oceans on Mars
Planetary Impacts
Mercury Cools
Valles Marineris, Mars
Outflow Channels on Mars
Meteorites From Mars
Olympus Mons, Mars
Lava Flows on Venus
Rings of Saturn
Volcanism Ends on Mercury
Giant Impact
The Moon Forms
Lunar Magma Ocean
Ancient Lunar Atmosphere
Oldest Moon Rocks
Lunar Crust
Lunar Volcanism
Moon Becomes Geologically Inactive
Longer Days More Distant Moon
Copernicus Crater
Closer Moon
Tycho Crater
Oldest Terrestrial Impact Record
Earliest Remnants of the Earth's Crust
Earth's Initial Crust
Volcanism on Earth
Earth's Early Atmosphere
Earth Adds Land
Earth's Earliest Continental Rocks and Oceans
Earth's Oldest Sedimentary Rocks
Oxygen Increases in the Atmosphere
Vredefort Impact Crater
The Oldest Rocks in the Grand Canyon
The Oldest Rocks in the Grand Canyon - Basement Rocks
Earth Goes into a Deep Freeze
Barren Land
Sudbury Impact
Origin of Life
Early Life
A New Type of Cell
Making Oxygen
Multicellular Marine Life
Cambrian Explosion of Life
Terrestrial Plants and Insects
Ocean Life Diversifies The first fish were jawless and belonged to the “Agnatha” superclass of fish, with characteristically defined skulls, made of either bone or cartilage. An example of this type of fish is the Haikouichthys which is now extinct but lived during the Cambrian Explosion. In Devonian time, from about 416 to 355 million years ago, fishes of many different types swam and hunted in the seas. Lobe-finned fishes — ancestors to the amphibians — and the early sharks made their appearance by this time.
Amphibians
Seed Plants
Reptiles
Permian Mass Extinction
First Dinosaurs
First Mammals
First Bird
Reptiles Diversify
Prehistoric Turtles
First Flowering Plants
Giant Impact
Age of Mammals
Human Ancestors
One Small Step - One Giant Leap |