251 MA MESOZOIC ERA (163
M) (251-67 MA) TRIASSIC PERIOD (50 M) (251-180
MA) LOWER TRIASSIC EPOCH
(5.10 M) (251-245.9 MA) STAGE
1 - LOWER TRIASSIC
(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 TRIASSIC (3.6
M)
(249.5-245.9 MA) 245.9 MA MIDDLE TRIASSIC EPOCH
(17.2 M)(245.9-228.7 MA) STAGE
3 - MIDDLE
TRIASSIC (8.9
M)
(245.9-237 MA) 237 MA STAGE
4 - MIDDLE TRIASSIC
(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 TRIASSIC EPOCH
(29.10 M)(228.7-199.6 MA) CARNIAN
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 NORIAN
STAGE (12.9
M)
( 216.5-203.6 MA) 203.6 MA RHAETIAN
STAGE (4
M)
(203.6-199.6
MA) 200 MA Gondwana
Supercontinent breaks up - after 300 M
years of cohesion