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geologic time scale: summary of
major events of the Earth’s
history preserved in the rock
record
•the history of the Earth is
divided by major changes in the
Earth’s surface, climate and/or
species
Eons: largest
segment of time;
(100s of millions-billions
of years)
1. Archean
2. Proterozoic
3. Phanerozoic
Eons are
divided into
Eras
Eras are
divided into
Periods
Periods divided
into Epochs
theory of
evolution: theory
that organisms
change over time
and new organisms
are derived from
ancestral types
•theory proposed
by Charles Darwin