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Cynognathus, a Triassic land reptile, fossils are found in South America and Africa.
The Triassic era was between 250,000,000 and 200,000,000 years ago.
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” The shells were deposited in layers on the Ocean floor over millions of years, layers that would be violently broken up and rippled into a mountain range 480,000,000 years ago by a catastrophic earthquake.
Mutations that reduce an organism’s ability to survive and reproduce will be less likely to end up in offspring.
Take a quantity of uranium-238 and in 4.5 billion years half of it will have turned into lead-206.
When molten rock hardens into a solid, the uranium-238 within it begins to decay.
By measuring the ratio of carbon-14 in a younger fossil, scientists can estimate its age.
These fossilized bacterial colonies date back 2.7 billion years and may extend 3.4 billion years.