ARCH 1030 Lecture Notes - Lecture 7: Orrorin, Eurocentrism, Transitional Fossil

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The big bang theory: 15 billion years ago. Formation of the sun: 5 billion years ago. First fossils: bacteria-like cells: 3. 6 billion years ago. Oxygen appears in the atmosphere: 1. 7 billion years ago. Cambrian period: 570 million years ago. Complex multicellular organisms: 543 million years ago. Cambrian explosion: 530 million years ago. Rapid change: 425 million years ago. Fish had evolved: 400 million years ago. Birds and reptiles: 256 million years ago. Plate tectonics: the movement of the plates of the earth"s crust caused by the interaction with the molten rock of the earth"s interior, the cause of continental drift. Dinosaurs: arrived around 235 million years ago, thrived until 65 million years ago, similar fossilized dinosaurs in places like asia, north america, and antarctica due to this supercontinent. Rise of the mammals: after the extinction of dinosaurs, 65 million years ago. Adaptive radiation: mammals were preadapted to take advantage of their new opportunities after the mass extinction of dinosaurs.

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