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