HOME Permian Period (299MA-251MA) Triassic Period (251MA-199.6MA) Jurassic Period (199.6MA-145.5MA) History Timeline Index

251 MA
MESOZOIC251 ERA (163 M) (251-67 MA)
TRIASSIC251 PERIOD (50 M) (251-180 MA)
LOWER TRIASSIC251 EPOCH (5.10 M) (251-245.9 MA)
STAGE 1 - LOWER TRIASSIC251 (1.5 M) (251-249.5 MA)
Permian-Triassic Extinction Event (P-T) - 96% marine species and 70% terrestial vertebrates extinct
250 MA
Lystrosaurus reptile - South Africa, India, Antarctica - supports continental drift - survived P-T event
249.5 MA
STAGE 2 - LOWER TRIASSIC249.5 (3.6 M) (249.5-245.9 MA)
245.9 MA
MIDDLE TRIASSIC245.9 EPOCH (17.2 M)(245.9-228.7 MA)
STAGE 3 - MIDDLE TRIASSIC245.9 (8.9 M) (245.9-237 MA)
237 MA
STAGE 4 - MIDDLE TRIASSIC237 (8.3 M) (237-228.7 MA)
230 MA
Beginning of major continental drifting
World wide red beds
Forests of conifers and cycads
Age of Reptiles begins
Mammals first appear
228.7 MA
UPPER TRIASSIC228.7 EPOCH (29.10 M)(228.7-199.6 MA)
CARNIAN228.7 STAGE (12.20 M) (228.7-216.5 MA)
220 MA
Acanthuses branch of sharks (freshwater mostly) becomes extinct after achieving worldwide distribution
216.5 MA
NORIAN216.5 STAGE (12.9 M) ( 216.5-203.6 MA)
203.6 MA
RHAETIAN203.6 STAGE (4 M) (203.6-199.6 MA)
200 MA
Gondwana Supercontinent breaks up - after 300 M years of cohesion

HOME Permian Period (299MA-251MA) Triassic Period (251MA-199.6MA) Jurassic Period (199.6MA-145.5MA) History Timeline Index