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This Concept Map, created with IHMC CmapTools, has information related to: Geo Time Madeleine revised, Oldest Rock More than 500 million years ago, Appalachian Mountains begin to form 250-500 million years ago, Age of reptiles 50-250 million years ago, Earth Formed More than 500 million years ago, Fossil evidence of first land plants 250-500 million years ago, Fossil evidence of first reptiles 250-500 million years ago, Dinosaurs become extinct 50-250 million years ago, Fossil evidence of first modern humans Less than 50 million years ago, Yucca Mountain formed Less than 50 million years ago, Fossil evidence of first life on Earth More than 500 million years ago