geologic time scale
a system of chronological dating that classifies geological strata (stratigraphy) in time
geological history of Mars
physical evolution of the planet Mars
Noachian
era of Mars' history
lunar geologic timescale
geological dating system of the Moon
Amazonian
Time period on Mars
European land mammal age
geologic time scale
South American land mammal age
geologic timescale for prehistoric South American fauna