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Geologist
A scientist who studies the Earth’s crust and it’s history.
Paleontologist
A scientist who studies fossil remains
Law of Superposition
Says the newest rock layers are found at the top of a rock sequence
Relative Age
Determines the relative order of past events, but not exact
Disturbed
When rock layers are shifted by forces
Index Fossils
Special fossils used to identify and date rock layers
Age
If 2 rock strata in different places contain the same index fossils, they are likely the same age.
Absolute Dating
The most accurate form of dating rocks and fossils. Also called radiometric dating.
Half-life
The predictable time an element takes to decay
Precambrian
About 88% of Earth’s history falls within the Precambrian era.
Geologic Time Scale
Broken into time chunks from largest to smallest : Eon, Era, Period, Epoch
Zircon
The oldest mineral found on Earth and was found in Australia. Around 4.4 billion years old
Pangaea
Super continent during the Paleozoic Era
Mesozoic Era
Dinosaurs, birds, and flowering plants first appeared
Cenozoic Era
Era we currently live in. The epoch is Holocene
How many mass extinctions have there been?
5
Cretaceous-Tertiary
Name of the most recent mass extinction about 65 million years ago
Meteor
Meteor strike is believed to have wiped out the dinosaurs