Geological Time Scale By jaydenbecker 4600 BCE Earth is formed 4600 BCE Archean Eon 2500 BCE Saskatchewan is part of a large ancient continent 2500 BCE Proterozoic Eon 2100 BCE Breakup of the ancient continent, creation of a large ocean 1900 BCE Volcanoes in SK 1850 BCE Wathaman Batholith (an intrusion of magma under the surface) 1800 BCE Orogeny Trans- Hudson Orogen Earth 1800 BCE Earth changes from an anoxygenic evironment 1800 BCE Martin Sandstone is deposited with Stromatolites 1700 BCE Erosion of the mountains 1300 BCE Uranium deposited 544 BCE Phanerozoic Eon 544 BCE Paleozoic Era 544 BCE Cambrian Period 544 BCE Hard shelled invertebrates including Trilobites 489 BCE Ordovician Period 478 BCE Meteorites hits SK, leaving behind the Carswell Meteorite Crater 470 BCE Tyndall Stone deposited as massive limestone 433 BCE Silurian Period 418 BCE Devonian Period 390 BCE Winnipegosis Reefs are deposited, later to become a trap for oil deposits 385 BCE Potash is deposited in the shallow ses that covers SK 360 BCE Carboniferous Period 355 BCE First amphibians 300 BCE Permian Period 253 BCE Mesozoic Era 253 BCE Triassic Period 248 BCE Mass extinction in the oceans, 90% of the species disppear 245 BCE First dinosaurs 220 BCE First mammals 213 BCE SK is again covered by a shallow sea 200 BCE Jurassic Period 144 BCE Cretaceous Period 100 BCE Diamonds are brought to the surface of SK in volcanic pipes 75 BCE Shallow sea begins to retreat 70 BCE Swamps, rivers and lakes form the badlands 70 BCE Lignite if formed from the plants deposited in swamps 66 BCE Triceratops roam SK 65 BCE Cenozoic Era 65 BCE Tertiary Period 65 BCE Paleocene Epoch 65 BCE Extinction of the dinosaurs 55 BCE Eocene Epoch 50 BCE Climate changes, Saskatchewan plateau develops 34 BCE Oligocene Epoch 23 BCE Miocene Epoch 5 BCE Pliocene Epoch 2 BCE Quaternary Period 2 BCE Pleistocene 2 BCE Ice age begins, covering SK except for Cypress Hills area 2 BCE Diamonds covered by glacial till 50 Bison come to North America (should be 0.05 BCE) 80 Humans come to North America (should be 0.02 BCE) 100 Origin of the Prairies (Should be 0.01 BCE) 100 Holocene Epoch (Should be 0.01 BCE)