system
Sign in to saveidealized composite unit of the geologic record representing the totality of rock strata laid down during a certain period of the geologic time scale
Connections
geologic time scale
Entity
stage
Entity
series
Entity
Wayback Machine
Entity
digital object identifier
Entity
unit of measurement
Entity
Cretaceous
Entity
Paleozoic
Entity
Mesozoic
Entity
Cenozoic
Entity
Carboniferous
Entity
Ordovician
Entity
Quaternary
Entity
stratigraphy
Entity
Proterozoic
Entity
Phanerozoic
Entity
Paleogene
Entity
Neogene
Entity
Miocene
Entity
Eocene
Entity