Geologic Time Scale Flashcards
1
Q
Remnant of any ancient animal
A
Fossil
2
Q
Age of Earth
A
4.6 billion years
3
Q
Time scale: Millions of years
A
Age
4
Q
Time Scale: tens of millions years
A
Epoch
5
Q
TS: 100 million years
A
Period
6
Q
TS: several hundred million years
A
Era
7
Q
TS: half billion years or more
A
Eon
8
Q
Two eons of Earth
A
Precambrian and Phanerozoic
9
Q
6 eraa of Earth
A
Cenozoic, Mesozoic, Paleozoic, Proterozoic, Archean, Hadean
10
Q
Cenozoic Periods
A
Quaternary, Tertiary
11
Q
Mesozoic Periods
A
Cretacious Jurassic Triassic
12
Q
Paleozoic Periods
A
Permian, Pennsylvanian, Mississipian, Devonian, Silurian, Ordovician, and Cambrian
13
Q
Quaternary Epochs
A
Holocene and Pleistocene
14
Q
Tertiary Epochs
A
Pliocene, Miocene, Oligocene, Eocene, and Paleocene
15
Q
Time needed for half of a sample to undergo radioactive decay
A
Half life
