Ordovician period
Ordovician
Cambrian period
Cambrian
Triassic period
Triassic
Acadian
Neoproterozoic
Stenian
Tonian
Triassic-Jurassic extinction event
Apatosaurus excelsus
Missippian period
apatosaur
thunder lizard
Lower Carboniferous
Devonian period
Devonian
Age of Fishes
Mississippian
Lower Carboniferous period
brontosaur
apatosaurus
brontosaurus
Iapetus
Mesozoic
Hettangian
Paleoproterozoic
Ediacaran
Paleozoic
Cryogenian
tertiary
Phanerozoic
Phanerozoic eon
Ludlow
Carboniferous
paleophycology
Carboniferous period
Phanerozoic aeon
Jurassic
Ectasian
Age of Man
Permian
conulariid
Quaternary period
Lower Paleozoic
Quaternary
-cene
Permian period
Paleolithic
Cenozoic
Stennian
Paleogene
Miocene
fucoid
Terreneuvian
Archean
Archeozoic eon
Silurian
Archean aeon
Archean eon
paleodistribution
Archeozoic
Campanian
Archaeozoic aeon
Proterozoic
Proterozoic eon
Archaeozoic
Proterozoic aeon
paleomicrobiomics
Toarcian
algologically
palaeoecology
era
genus Barosaurus
paleoalgology
Sinemurian
Bathonian
Kimmeridgian
Pliensbachian
Siderian
Callovian
Bajocian
Jurassic period
Pennsylvanian period
Upper Carboniferous
K-T boundary
Pennsylvanian
Upper Carboniferous period
Aalenian
Tertiary
fossiliferously