Geologic Time Slideshow

Earth's Age

• 4.543 billion years old
• Scientist calculate elements forming of radioactive uranium decaying over billions of years

Untitled Slide

Precambrian Era

• 4.6 billion years ago
• Sponge-like, soft-bodied sea creatures,
• It is believed that early animal life evolved from protists at this time

Paleozoic Era

• 542 million years ago
• The era began with the breakup of one supercontinent
• Tetrapods, marine reptiles, including lizards and snakes,crocodiles, dinosaurs and birds

Mesozoic Era

• 65 million years ago
• Mesozoic means "middle animals,"
• Dinosaurs, which evolved further down the road

Triassic Period

• 199 million years ago
• Another lineage of Archosaurs evolved into true dinosaurs by the mid-Triassic.
• The first dinosaurs roamed. Mammal-like reptiles were common

Triassic Period

• 199 million years ago
• The great mass extinction, was a time when life outside of the oceans began to diversify.
• Spiders, scorpions, newer groups of beetles,etc. Only new insect group of the Triassic was the grasshopper

Jurassic Period

• 145.5 million years ago
• The largest animals ever to live were dinosaurs of this period
• Brachiosaurus, Stegosaurus, Pterosaurs, Tyrannosaurus, ETC.

Cretaceous Period

• 65.5 million years ago
• Continents were in very different positions than they are today
• Warm Climate
• Large herds thrived during this period

Cenozoic Era

• 65 million years
• Cenozoic, first spelled "Kainozoic," is derived from the Greek phrase meaning “recent life.”
• Warm Climate
• Cave lions, Sabre-toothed cats, cave bears, giant deer, woolly rhinoceroses, woolly mammoths, etc.

Resorces

• https://www.boundless.com
• http://www.livescience.com/