5.5 Flashcards
1
Q
the standard method used to divided the Earth’s long natural history into manageable parts
A
geologic time scale
2
Q
the largest division of geologic time
A
eon
3
Q
a unit of geologic time that includes two or more periods
A
era
4
Q
a unit of geologic time into which eras are divided
A
period
5
Q
a subdivision of a geologic period
A
epoch
6
Q
the death of every member of a species
A
extinction
7
Q
when the number of marine species increased greatly
A
Hallucigenia
8
Q
called this because reptiles were most dominate species
A
Age of Reptiles
9
Q
called this because mammals were the most dominate species
A
Age of Mammals
