Mesozoic - Age of Dinosaurs, End of Cretaceous - Dinosaur Extinction, Fossil - Remains of ancient life, Fossils are found in this rock - Sedimentary, Index Fossil - Widespread, Abundant, Short Lived, 4.6 bya - Age of Earth (maybe), Cenozoic - Present day, Mammals and Humans, Paleozoic - Explosion of life in oceans, sea creatures, fish, Cyanobacteria/Blue Green Algae - Belived to be the earliest life, Produced Oxygen,

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