HOME                                 Cambrian Period  (542MA-488.3MA)        Ordovician Period (488.3-443.7MA)        Silurian Period (443.7MA-416MA)                History Timeline Index



488.3 MA               ORDOVICIAN488.3 PERIOD  (45.3 M)       (488.3-443 MA)

                   Ice Age in Africa

                                Chordates appear

                                Graptolites

                                Corals

                   LOWER ORDOVICIAN488 EPOCH (16.5 M)(488.3-471.8 MA)

                   TREMADOCIAN488 STAGE          (9.7 M)                                   (488.3-478.6 MA)

478.6 MA           FLOIAN478.6 STAGE          (6.8 M)                                                (478.6-471.8 MA)

471.8 MA               MIDDLE ORDOVICIAN471.8 EPOCH (10.9 M) (471.8-460.9 MA)

                   STAGE I - MID ORDIVICIAN (3.7 M)                                  (471.8-468.1 MA)

                        STAGE 2 - MID ORDIVICIAN  (7.20)                                 (468.1-460.9 MA)

460.9 MA           UPPER ORDOVICIAN460.9 EPOCH (17.20) (460.9-443.7 MA)

                   SANDBIAN460.9 STAGE (5.10 M)                                    (460.9-455.8 MA)

455.8 MA               KATIAN455.8 STAGE (10.2 M)                                          (455.8-445.6 MA)

450 MA                  Sharks appear? (450-420 MA)

445.6 MA               HIMANTIAN445.6  (1.9 M)                                                   (445.6-443.7 MA)


HOME                                 Cambrian Period  (542MA-488.3MA)        Ordovician Period (488.3-443.7MA)        Silurian Period (443.7MA-416MA)                History Timeline Index