List the periods of the Phanerozoic in the correct order, starting with the Cambrian and ending with the Quaternary. List their boundary dates and place the extinctions of the Phanerozoic on the timescale in the order they occurred. Which major plant/animal groups went extinct? Next, add the Hadean, Archean, and Proterozoic. Finally, place the following correctly on the timescale: - First Flowering Plants - First Amniotes - First Mammals - Small Shelly Fauna - Initial increase in atmospheric [O2] - First vascular plants - First stromatolites - Extensive grasslands - Cambrian Explosion - Extinction of non-bird dinosaurs

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