stage
unit in chronostratigraphy
Portland Group
Late Jurassic (Tithonian) lithostratigraphic group (a sequence of rock strata) in South East England (is derived from the Isle of Portland in Dorset where the strata are exposed and have been extensively worked)
Lutetian
second age of the Eocene epoch
Orleanian
geologic time period
Pre-Illinoian
oldest stage in the North American regional subdivision of the Quaternary
Late Pleistocene
Fourth and final age of the Pleistocene Epoch
Rhaetian
third and last stage and age of the Upper Triassic series / Late Triassic epoch
regional stage
stratigraphic unit in use within particular region
Calabrian
second age of the Pleistocene Epoch
Santonian
fourth stage and age of the Upper Cretaceous series/Late Cretaceous epoch
Aragonian
continetal stage of southern Europe Miocene