-
2
formation of the Earth
Era - 3.6
Period - permain
3.6 billion years ago -
3
dinosaurs become extinct
Era - flowering plants become dominant
Period - cretaceous
14 million years ago -
3
first Eukaryotic cells
Era - Precambrian
Period -Cambrian
20million years ago -
4
first birds
Era - Mesozoic
Period - cretaceous
140 million years ago -
5
tertiary
Era -Mesozoic
Period - cretaceous
65 million years ago -
7
First placental mammals
Era - Cenozoic
Period - Tertiary
24 million years ago -
8
grass forms
Era - Cenozoic
Period - quarter
20 million years ago -
9
Humans Evolve
Era - Cenozoic
Period-Quaternary
4 Million Year Ago