series
sequence of rock depositions defining a chronostratigraphic unit corresponding to a specific epoch on the geologic time scale
Early Jurassic
first epoch of the Jurassic period
Early Cretaceous
first geologic series and epoch of the Cretaceous system and period
Ludlow
third epoch of the Silurian period
Early Ordovician
first epoch of the Ordovician Period
Middle Jurassic
second series and epoch of the Jurassic system and period
Late Triassic
third and last series and epoch of the Triassic system / Triassic period
Early Devonian
first epoch of the Devonian period
Middle Cambrian
Cambrian subdivision (old classification)
Caradoc
former geological series overlapping the Sandbian and Katian
Upper Cambrian
Cambrian subdivision (old classification)
Miocene
First epoch of the Neogene Period
Paleocene
First epoch of the Paleogene Period
Late Cretaceous
second geologic series and epoch of the Cretaceous system and period
Late Pennsylvanian
third and final series and epoch of the Pennsylvanian Subsystem and Subperiod; sixth and final of the Carboniferous System and Period
Pleistocene
first epoch of the Quaternary Period
Eocene
second epoch of the Paleogene period
Middle Devonian
second epoch of the Devonian period
Middle Triassic
Second epoch of the Triassic period
Silesian
European subdivision of the Carboniferous period of the geological timescale
Late Devonian
third and last epoch of the Devonian period
Holocene
Second and current epoch of the Quaternary Period
Pliocene
second and final epoch of the Neogene Period
Middle Ordovician
second epoch of the Ordovician Period
Late Jurassic
third epoch of the Jurassic Period
Oligocene
third and last series and epoch of the Paleogene system and period
Early Triassic
first series and epoch of the Triassic system and period
Late Ordovician
third and final epoch of the Ordovician Period
Lower Cambrian
Cambrian subdivision (old classification)