Cambrian Period (542MA-488.3MA) Ordovician Period (488.3-443.7MA)
Silurian Period (443.7MA-416MA) History Timeline Index
488.3 MA
ORDOVICIAN
PERIOD (488.3-443 MA)
Ice Age in
Africa
Chordates
appear
Graptolites
Corals
LOWER ORDOVICIAN EPOC (488.3-471.8 MA)
TREMADOCIAN
STAGE (9.7
M)
(488.3-478.6 MA)
478.6 MA
FLOIAN
STAGE (6.8
M)
(478.6-471.8
MA)
471.8 MA
MIDDLE ORDOVICIAN EPOCH
(471.8-460.9 MA)
STAGE
I - MID ORDIVICIAN
(471.8-468.1 MA)
STAGE 2 -
MID
ORDIVICIAN
(7.20)
(468.1-460.9 MA)
460.9 MA
UPPER
ORDOVICIAN EPOCH (460.9-443.7 MA)
SANDBIAN
STAGE
(460.9-455.8
MA)
455.8 MA
KATIAN
STAGE
(455.8-445.6
MA)
450 MA
Sharks appear possibly (450-420
MA)
445.6 MA
HIMANTIAN
(445.6-443.7 MA)
Cambrian Period (542MA-488.3MA) Ordovician Period (488.3-443.7MA)
Silurian Period (443.7MA-416MA) History Timeline Index