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Zircon Crystal

Zircon forms in the tetragonal system. It can be colorless to yellow, orange, brown, pink, red, green, and blue. These colors are caused by rare, radioactive elements in stages of radioactive breakdown. It was formed 4.4 bya.

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Acasta Gneiss

It was found near the Acasta River. It is a very important rock because it contains fragments of the oldest known crust and is recorded to have more than a billion years of magmatism and metamorphism. It was formed 4.03 bya.

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Origin of life

The first living organisms on earth, like microscopic bacteria, were found in the oceans. It was formed 3.5 bya.

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Tectonic Plate Movement

The early tectonic plates began to move, which created the first rift valleys and geologic features. It started 4 bya.

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Ohio Underwater

There is proof that Oxford, Ohio was once part of an inland sea that stretched to the Gulf of Mexico to the Arctic. It was also full of marine life at one point. This was 450 mya.

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Mountain Building - Appalachian Mountains

This was the initial squeeze of the margin of North America. This occured 470 mya.

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The formation of the supercontinent Pangaea through continental collisions

A major geological collision that created the pangea. This happened 320 mya.

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Permian Extinction

It is the most severe extinct event. It was very invasive and killed off most things. This happened 252 mya.

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Dinosaurs

The First fossil that was found of dinosaurs was in Cornwell, Oxfordshire, Uk. Dinosaur fossils have now been found on all 7 continents of the earth. They formed 165 mya.

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Continental Drift

The Earth moved into separate continents over time due to tectonic plate motion. This occured 200 mya.

It happened in Antarctica, southern South America, southern Africa, India, and Australia.

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Rocky Mountains rose

The Laramide Orogeny (mountain building event) uplifted the Rocky Mountains. This caused a lot of events afterwards, like extensive volcanic ash falls and mudflows. This happened 75 mya.

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Formation of Atlantic Ocean

It was formed mostly because of the breakup of the supercontinent pangea. It was formed about 180 mya.

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Volcano Eruption

Toba supervolcano - an ancient volcanic eruption. Around 10,000 individuals survived this. This happened 74,000 years ago.

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Meteor Impact

30 meter-diameter asteroid/comet. This explosion knocked down approximately 80 million trees over an area that was 2,150 square kilometers. This occured in 1908 (117 years ago).

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Ardi

This is the oldest found fossil of a female skeleton. It was formed 4.4 mya.

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Human Artifacts

Stone tools, figurines, and wooden structures were found. They seem human-made and act as some tools we now have today. They were created 3.3 mya.