Triassic-Jurassic extinction event
Triassic period
Triassic
Acadian
Devonian
Hettangian
mass extinction event
Jurassic
Ictodosauria
order Ictodosauria
Cambrian
Cambrian period
Permian
Permian period
dinosaur
Tonian
Jurassic period
hylaeosaurus
Orosirian
Rhyacian
Permian-Triassic extinction
Ordovician
Great Dying
Permian-Triassic mass extinction
Mesozoic
end-Cretaceous
Siderian
Cryogenian
genus Barosaurus
Ediacaran
Ectasian
semiextinction
Aegyptopithecus
Stenian
mass extinction
Sinemurian
Callovian
thunder lizard
Kimmeridgian
Bajocian
Bathonian
Pliensbachian
Apatosaurus excelsus
brontosaurus
Toarcian
apatosaur
apatosaurus
brontosaur
Coniacian
Santonian
Carboniferous period
Paleogene
semiextinct
Carboniferous
Cenomanian
Statherian
age of extinction
plesiosaur
Synapsida
subclass Synapsida
Edmontonian
Miocene
Calymmian
Neogene
Paleozoic era
Paleozoic
K-T boundary
paleopopulation
Pleistocene
archosaurian reptile
archosaurian
end-Triassic mass extinction
palaeoecology
Aptian
archosaur
Pennsylvanian period
nimravid
Wenlock
paleohabitat
Mambawakale
Campanian
Laramide
Upper Carboniferous period
finicretaceous
Pennsylvanian
fossilism
Cretaceous
Ordovician period
Upper Carboniferous
order Therapsida
Eocene
Therapsida
Carnian