-
beginning of cambrian period 570M-500M
-
end of cambrian period. beginning of ordovician period. 500M-435M
-
end of ordovicain period. Beginning of Silurian period. 435M-395M
-
trilobites
-
end of silurian period. beginning of Devonian period 395M-345M
-
end of devonian period. beginning of Carboniferous period 345M-280M
-
end of carboniferous period.beginning of Permian period 280M-225M
-
ending of permian period. beginning of Triassic period 225M-195M
-
end of triassic period. beginning of jurassic period 195M-136M
-
end of jurassic period. beginning of cretaceous period 136M-65M
-
end of cretacious period. beginning of tertiary period 65M-1.8M
-
end of tertiary period.beginning of Quaternary period 1.8M- Present
-
end of quarternary period. Present
