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Geologic Time / Fossil Record

Earth Science

PhanerozoicVisible Life
MesozoicMiddle Life
PaleozoicAncient Life
Index Fossilexample - trilobite; fossil in a rock used to date the rock
unconformitybreak in rock sequence
absolute datingprecisely measures age of fossil/rock
relative datingdates rocks in relation to one another
Cryptozoicsecret life
Holocene Epochcurrent epoch; 10,000 years until present
half-lifetime it takes for 50% of the element to decay
trilobiteused as an index fossil
meteor impact65 million years ago
radiometric datinguses the half-life of element decay to determine age

Ms. Caicedo

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