3.5 Time Marches On Flashcards
1
Q
the standard method used to divide 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
appeared during the Cambrian period when the number of marine species greatly increased
A
Hallucigenia
8
Q
the Mesozoic era is also known as this because reptiles inhabited land
A
Age of Reptiles
9
Q
the Cenozoic era is known as this because mammals flourished
A
Age of the Mammals
