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| Description: Phanerozoic History Mesozoic era Early in the Mesozoic much of the land was above sea level By the middle Mesozoic, seas invaded western North America Pangaea began to break apart and the westward-moving North American plate began to override the Pacific plate Mesozoic era Pangaea began to break apart and the westward-moving North American plate began to override the Pacific plate Resulted in crustal deformation along the entire western margin of North America Formed the Sierra Nevada and Rocky Mountains Cenozoic era Much of North America was above sea level throughout the Cenozoic Eastern and western margins of the continent experienced markedly contrasting events Atlantic and Gulf coastal regions, removed from active plate boundaries, were tectonically stable Cenozoic era Much of North America was above sea level throughout the Cenozoic In the West, the Laramide Orogeny (Rocky Mountains) was ending, the Basin and Range Province was forming, and volcanic activity was extensive Earth’s First Life Prokaryotes First known organisms Single-celled bacteria Lacked a nucleus Cynobacteria One group of prokaryotes Used solar energy to synthesize organic compounds, thus producing their own food Fossil evidence of these bacteria include layered mounds called stromatolites Picture Stats: Views: 212 Filesize: 2.23MB Height: 573 Width: 1398 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39636 |