Table 2.1 The geologic timescale.
Era
Cenozoic
Mesozoic
Period
Quaternary
Tertiary
Cretaceous
Jurassic
Triassic
Epoch
Holocene
Pleistocene
Pliocene
Miocene
Oligocène
Eocene
Paleocene
Approximate Duration
(Millions
of Years)
10,000 years ago to the
present
2
11
12
11
22
71
71
54
35
Approximate Number of
Years Ago (Millions of Years)
.01
2
13
25
36
58
65
136
190
32 PETROLEUM TECHNOLOGY, ECONOMICS, AND POLITICS