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- 65.5 mya: Meteor impact, 170 km crater Chicxulub, Yucatan, Mexico  - Tertiary Period (65.5 to 2.58 mya) Paleocene Epoch (65.5 to 55.8 mya) - 63 mya: End of Deccan Traps volcanic eruptions in India - Flowering plants become widespread.
- 70% of new bird lineages evolved within five million years after the extinction of the dinosaurs. - Appearance of placental mammals (marsupials, insectivores, lemuroids, creodonts) - 60 mya: Earliest known ungulate (hoofed mammal) - The Laramide orogeny starts forming the Rocky Mountains and draining the Western Interior Seaway.
Laurasia and Gondwana rejoined approximately 275 million years ago to form the supercontinent Pangea.
The break up of Pangea, which still goes on today, has contributed to the formation of the Atlantic Ocean.
The Moon is 375,000 km from Earth. - Giant arthropods populate the land - Transgression and regression of the seas caused by glaciation - Deposits of coal form in Europe, Asia, and North America Permian Period (299 to 251 mya) - 275 mya: Formation of the supercontinent Pangea - Conifers and cycads first appear - Earth is cold and dry - Sail-backed synapsids like Edaphosaurus and Dimetrodon appeared - 260 mya: End of Karoo ice age.mammals - 145 mya: Meteor impact, 70 km crater Morokweng, South Africa  Cretaceous Period (145.5 to 65.5 mya) - Period of Active Crust Plate Movements - 133 mya: Meteor impact, 55 km crater Tookoonooka, Australia  - 125 mya: Africa and India separate from Antarctica - Flowering plants (angiosperms) appeared Montsechia vidalli was one of the first angiosperms.- 120 mya: Global warming event starts Carbon dioxide levels were 550 to 590 ppm  - Proliferation of single-cell organisms (diatoms, dinoflagellates, and calcareous nannoplankton) changed ocean composition. - 110 mya: Crocodiles appeared - Snakes evolved during the mid-Cretaceous - 105 mya: South America breaks away from Africa - Formation of the Atlantic Ocean - Earth has no polar ice - Oldest group of living placental mammals developed - 100 mya: Earth's magnetic field is 3 times stronger than today.- 240 mya: Sea urchins (Arkarua) appear - 235 mya: Evolutionary split between dinosaurs and lizards - Giant marine ichthyosaurs and plesiosaurs populate the seas - First small dinosaurs such as coelophysis appear on land - Adelobasileus proto-mammal emerged (225 mya) killed 20% of all marine families Jurassic Period (199.6 to 145.5 mya) - Earth is warm.There is no polar ice - Cycads, conifers and ginkgoes are the dominant plants - Age of the dinosaurs - Giant herbivores and vicious carnivores dominate the land - Flying reptiles (Pterosaurs) appeared.